changelog: add all new NixOS modules

kicad: 2013 stable -> 4.0.2
(cherry picked from commit cce37d2164)
2026-01-13 11:30:35 +08:00 · 2016-03-31 23:00:24 +01:00 · 2016-03-31 23:11:47 +02:00 · 2016-03-31 23:11:00 +02:00 · 2016-03-31 20:50:37 +02:00 · 2016-03-31 19:53:21 +03:00
17342 changed files with 1229173 additions and 1025346 deletions
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -1,8 +0,0 @@
-;;; Directory Local Variables
-;;; For more information see (info "(emacs) Directory Variables")
-
-((nil
-  (bug-reference-bug-regexp . "\\(\\(?:[Ii]ssue \\|[Ff]ixe[ds] \\|[Rr]esolve[ds]? \\|[Cc]lose[ds]? \\|[Pp]\\(?:ull [Rr]equest\\|[Rr]\\) \\|(\\)#\\([0-9]+\\))?\\)")
-  (bug-reference-url-format . "https://github.com/NixOS/nixpkgs/issues/%s"))
- (nix-mode
-  (tab-width . 2)))
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,28 +0,0 @@
-# EditorConfig configuration for nixpkgs
-# http://EditorConfig.org
-
-# Top-most EditorConfig file
-root = true
-
-# Unix-style newlines with a newline ending every file, utf-8 charset
-[*]
-end_of_line = lf
-insert_final_newline = true
-trim_trailing_whitespace = true
-charset = utf-8
-
-# see https://nixos.org/nixpkgs/manual/#chap-conventions
-
-# Match nix/ruby/docbook files, set indent to spaces with width of two
-[*.{nix,rb,xml}]
-indent_style = space
-indent_size = 2
-
-# Match shell/python/perl scripts, set indent to spaces with width of four
-[*.{sh,py,pl}]
-indent_style = space
-indent_size = 4
-
-# Match diffs, avoid to trim trailing whitespace
-[*.{diff,patch}]
-trim_trailing_whitespace = false
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,16 +0,0 @@
-**/deps.nix linguist-generated
-**/node-packages.nix linguist-generated
-
-pkgs/applications/editors/emacs-modes/*-generated.nix linguist-generated
-pkgs/development/r-modules/*-packages.nix linguist-generated
-pkgs/development/haskell-modules/hackage-packages.nix linguist-generated
-pkgs/development/beam-modules/hex-packages.nix linguist-generated
-
-doc/** linguist-documentation
-doc/default.nix linguist-documentation=false
-
-nixos/doc/** linguist-documentation
-nixos/doc/default.nix linguist-documentation=false
-
-nixos/modules/module-list.nix merge=union
-# pkgs/top-level/all-packages.nix merge=union
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1,99 +0,0 @@
-# CODEOWNERS file
-#
-# This file is used to describe who owns what in this repository. This file does not
-# replace `meta.maintainers` but is instead used for other things than derivations
-# and modules, like documentation, package sets, and other assets.
-#
-# For documentation on this file, see https://help.github.com/articles/about-codeowners/
-# Mentioned users will get code review requests.
-
-# This file
-/.github/CODEOWNERS @edolstra
-
-# Libraries
-/lib                        @edolstra @nbp
-/lib/systems                @nbp @ericson2314
-/lib/generators.nix         @edolstra @nbp @Profpatsch
-/lib/debug.nix              @edolstra @nbp @Profpatsch
-
-# Nixpkgs Internals
-/default.nix                          @nbp
-/pkgs/top-level/default.nix           @nbp @Ericson2314
-/pkgs/top-level/impure.nix            @nbp @Ericson2314
-/pkgs/top-level/stage.nix             @nbp @Ericson2314
-/pkgs/stdenv/generic                  @Ericson2314
-/pkgs/stdenv/cross                    @Ericson2314
-/pkgs/build-support/cc-wrapper        @Ericson2314 @orivej
-/pkgs/build-support/bintools-wrapper  @Ericson2314 @orivej
-/pkgs/build-support/setup-hooks       @Ericson2314
-
-# NixOS Internals
-/nixos/default.nix          @nbp
-/nixos/lib/from-env.nix     @nbp
-/nixos/lib/eval-config.nix  @nbp
-/nixos/doc/manual/configuration/abstractions.xml      @nbp
-/nixos/doc/manual/configuration/config-file.xml       @nbp
-/nixos/doc/manual/configuration/config-syntax.xml     @nbp
-/nixos/doc/manual/configuration/modularity.xml        @nbp
-/nixos/doc/manual/development/assertions.xml          @nbp
-/nixos/doc/manual/development/meta-attributes.xml     @nbp
-/nixos/doc/manual/development/option-declarations.xml @nbp
-/nixos/doc/manual/development/option-def.xml          @nbp
-/nixos/doc/manual/development/option-types.xml        @nbp
-/nixos/doc/manual/development/replace-modules.xml     @nbp
-/nixos/doc/manual/development/writing-modules.xml     @nbp
-/nixos/doc/manual/man-nixos-option.xml                @nbp
-/nixos/modules/installer/tools/nixos-option.sh        @nbp
-
-# Python-related code and docs
-/maintainers/scripts/update-python-libraries	@FRidh
-/pkgs/top-level/python-packages.nix     @FRidh
-/pkgs/development/interpreters/python   @FRidh
-/pkgs/development/python-modules        @FRidh
-/doc/languages-frameworks/python.md     @FRidh
-
-# Haskell
-/pkgs/development/compilers/ghc                       @peti @ryantm @basvandijk
-/pkgs/development/haskell-modules                     @peti @ryantm @basvandijk
-/pkgs/development/haskell-modules/default.nix         @peti @ryantm @basvandijk
-/pkgs/development/haskell-modules/generic-builder.nix @peti @ryantm @basvandijk
-/pkgs/development/haskell-modules/hoogle.nix          @peti @ryantm @basvandijk
-
-# R
-/pkgs/applications/science/math/R   @peti
-/pkgs/development/r-modules         @peti
-
-# Ruby
-/pkgs/development/interpreters/ruby @zimbatm
-/pkgs/development/ruby-modules      @zimbatm
-
-# Rust
-/pkgs/development/compilers/rust @Mic92 @LnL7
-
-# Darwin-related
-/pkgs/stdenv/darwin         @NixOS/darwin-maintainers
-/pkgs/os-specific/darwin    @NixOS/darwin-maintainers
-
-# Beam-related (Erlang, Elixir, LFE, etc)
-/pkgs/development/beam-modules                  @gleber
-/pkgs/development/interpreters/erlang           @gleber
-/pkgs/development/interpreters/lfe              @gleber
-/pkgs/development/interpreters/elixir           @gleber
-/pkgs/development/tools/build-managers/rebar    @gleber
-/pkgs/development/tools/build-managers/rebar3   @gleber
-/pkgs/development/tools/erlang                  @gleber
-
-# Jetbrains
-/pkgs/applications/editors/jetbrains @edwtjo
-
-# Eclipse
-/pkgs/applications/editors/eclipse @rycee
-
-# https://github.com/NixOS/nixpkgs/issues/31401
-/lib/licenses.nix @ghost
-
-# Qt / KDE
-/pkgs/applications/kde @ttuegel
-/pkgs/desktops/plasma-5 @ttuegel
-/pkgs/development/libraries/kde-frameworks @ttuegel
-/pkgs/development/libraries/qt-5 @ttuegel
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -12,41 +12,4 @@ under the terms of [COPYING](../COPYING), which is an MIT-like license.

 ## Submitting changes

-* Format the commit messages in the following way:
-
-  ```
-  (pkg-name | nixos/<module>): (from -> to | init at version | refactor | etc)
-
-  (Motivation for change. Additional information.)
-  ```
-
-  Examples:
-
-  * nginx: init at 2.0.1
-  * firefox: 54.0.1 -> 55.0
-  * nixos/hydra: add bazBaz option
-
-    Dual baz behavior is needed to do foo.
-  * nixos/nginx: refactor config generation
-
-    The old config generation system used impure shell scripts and could break in specific circumstances (see #1234).
-
-* `meta.description` should:
-  * Be capitalized.
-  * Not start with the package name.
-  * Not have a period at the end.
-* `meta.license` must be set and fit the upstream license.
-  * If there is no upstream license, `meta.license` should default to `stdenv.lib.licenses.unfree`.
-* `meta.maintainers` must be set.
-
-See the nixpkgs manual for more details on [standard meta-attributes](https://nixos.org/nixpkgs/manual/#sec-standard-meta-attributes) and on how to [submit changes to nixpkgs](https://nixos.org/nixpkgs/manual/#chap-submitting-changes).
-
-## Writing good commit messages
-
-In addition to writing properly formatted commit messages, it's important to include relevant information so other developers can later understand *why* a change was made. While this information usually can be found by digging code, mailing list/Discourse archives, pull request discussions or upstream changes, it may require a lot of work.
-
-For package version upgrades and such a one-line commit message is usually sufficient.
-
-## Reviewing contributions
-
-See the nixpkgs manual for more details on how to [Review contributions](https://nixos.org/nixpkgs/manual/#sec-reviewing-contributions).
+See the nixpkgs manual for details on how to [Submit changes to nixpkgs](http://hydra.nixos.org/job/nixpkgs/trunk/manual/latest/download-by-type/doc/manual#chap-submitting-changes).
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -1,12 +1,17 @@
-## Issue description
+## Basic info

+To make sure that we are on the same page:

+* Kernel: (run `uname -a`)
+* System: (NixOS: `nixos-version`, Ubuntu/Fedora: `lsb_release -a`, ...)
+* Nix version: (run `nix-env --version`)
+* Nixpkgs version: (run `nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion`)
+
+## Describe your issue here
+
+### Expected result
+
+### Actual result

 ### Steps to reproduce

-
-
-## Technical details
-
-Please run `nix-shell -p nix-info --run "nix-info -m"` and paste the
-results.
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -1,20 +1,18 @@
-###### Motivation for this change
+###### Things done:

-
-###### Things done
-
-<!-- Please check what applies. Note that these are not hard requirements but merely serve as information for reviewers. -->
-
- [ ] Tested using sandboxing ([nix.useSandbox](http://nixos.org/nixos/manual/options.html#opt-nix.useSandbox) on NixOS, or option `sandbox` in [`nix.conf`](http://nixos.org/nix/manual/#sec-conf-file) on non-NixOS)
- Built on platform(s)
-   - [ ] NixOS
-   - [ ] macOS
-   - [ ] other Linux distributions
- [ ] Tested via one or more NixOS test(s) if existing and applicable for the change (look inside [nixos/tests](https://github.com/NixOS/nixpkgs/blob/master/nixos/tests))
+- [ ] Tested using sandboxing (`nix-build --option build-use-chroot true` or [nix.useChroot](http://nixos.org/nixos/manual/options.html#opt-nix.useChroot) on NixOS)
+- [ ] Built on platform(s): NixOS / OSX / Linux
 - [ ] Tested compilation of all pkgs that depend on this change using `nix-shell -p nox --run "nox-review wip"`
 - [ ] Tested execution of all binary files (usually in `./result/bin/`)
- [ ] Determined the impact on package closure size (by running `nix path-info -S` before and after)
 - [ ] Fits [CONTRIBUTING.md](https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md).

+###### More
+
+Fixes issue #<insert id>
+
+cc @<maintainer>
+
+
 ---

+_Please note, that points are not mandatory, but rather desired._
--- a/.mention-bot
+++ b/.mention-bot
@@ -0,0 +1,5 @@
+{
+  "userBlacklist": [
+    "civodul"
+  ]
+}
--- a/.travis.yml
+++ b/.travis.yml
@@ -0,0 +1,7 @@
+language: python
+python: "3.4"
+sudo: required
+dist: trusty
+before_install: ./maintainers/scripts/travis-nox-review-pr.sh nix
+install: ./maintainers/scripts/travis-nox-review-pr.sh nox
+script: ./maintainers/scripts/travis-nox-review-pr.sh build
--- a/.version
+++ b/.version
@@ -1 +1 @@
-18.09
+16.03
--- a/6
+++ b/6
@@ -1,4 +1,4 @@
-Copyright (c) 2003-2018 Eelco Dolstra and the Nixpkgs/NixOS contributors
+Copyright (c) 2003-2016 Eelco Dolstra and the Nixpkgs/NixOS contributors

 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
@@ -23,7 +23,9 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 Note: the license above does not apply to the packages built by the
 Nix Packages collection, merely to the package descriptions (i.e., Nix
-expressions, build scripts, etc.).  It also might not apply to patches
+expressions, build scripts, etc.).  Also, the license does not apply
+to some of the binaries used for bootstrapping Nixpkgs (e.g.,
+pkgs/stdenv/linux/tools/bash).  It also might not apply to patches
 included in Nixpkgs, which may be derivative works of the packages to
 which they apply.  The aforementioned artifacts are all covered by the
 licenses of the respective packages.
--- a/README.md
+++ b/README.md
@@ -1,41 +1,43 @@
-[<img src="https://nixos.org/logo/nixos-hires.png" width="500px" alt="logo" />](https://nixos.org/nixos)
+[<img src="http://nixos.org/logo/nixos-hires.png" width="500px" alt="logo" />](https://nixos.org/nixos)

-[![Code Triagers Badge](https://www.codetriage.com/nixos/nixpkgs/badges/users.svg)](https://www.codetriage.com/nixos/nixpkgs)
+[![Build Status](https://travis-ci.org/NixOS/nixpkgs.svg?branch=master)](https://travis-ci.org/NixOS/nixpkgs)
+[![Issue Stats](http://www.issuestats.com/github/nixos/nixpkgs/badge/pr?style=flat)](http://www.issuestats.com/github/nixos/nixpkgs)
+[![Issue Stats](http://www.issuestats.com/github/nixos/nixpkgs/badge/issue?style=flat)](http://www.issuestats.com/github/nixos/nixpkgs)

 Nixpkgs is a collection of packages for the [Nix](https://nixos.org/nix/) package
-manager. It is periodically built and tested by the [Hydra](https://hydra.nixos.org/)
+manager. It is periodically built and tested by the [hydra](http://hydra.nixos.org/)
 build daemon as so-called channels. To get channel information via git, add
 [nixpkgs-channels](https://github.com/NixOS/nixpkgs-channels.git) as a remote:

 ```
-% git remote add channels https://github.com/NixOS/nixpkgs-channels.git
+% git remote add channels git://github.com/NixOS/nixpkgs-channels.git
 ```

 For stability and maximum binary package support, it is recommended to maintain
-custom changes on top of one of the channels, e.g. `nixos-18.09` for the latest
+custom changes on top of one of the channels, e.g. `nixos-15.09` for the latest
 release and `nixos-unstable` for the latest successful build of master:

 ```
 % git remote update channels
-% git rebase channels/nixos-18.09
+% git rebase channels/nixos-15.09
 ```

 For pull-requests, please rebase onto nixpkgs `master`.

-[NixOS](https://nixos.org/nixos/) Linux distribution source code is located inside
+[NixOS](https://nixos.org/nixos/) linux distribution source code is located inside
 `nixos/` folder.

 * [NixOS installation instructions](https://nixos.org/nixos/manual/#ch-installation)
 * [Documentation (Nix Expression Language chapter)](https://nixos.org/nix/manual/#ch-expression-language)
 * [Manual (How to write packages for Nix)](https://nixos.org/nixpkgs/manual/)
 * [Manual (NixOS)](https://nixos.org/nixos/manual/)
-* [Community maintained wiki](https://nixos.wiki/)
+* [Nix Wiki](https://nixos.org/wiki/)
 * [Continuous package builds for unstable/master](https://hydra.nixos.org/jobset/nixos/trunk-combined)
-* [Continuous package builds for 18.09 release](https://hydra.nixos.org/jobset/nixos/release-18.09)
+* [Continuous package builds for 15.09 release](https://hydra.nixos.org/jobset/nixos/release-15.09)
 * [Tests for unstable/master](https://hydra.nixos.org/job/nixos/trunk-combined/tested#tabs-constituents)
-* [Tests for 18.09 release](https://hydra.nixos.org/job/nixos/release-18.09/tested#tabs-constituents)
+* [Tests for 15.09 release](https://hydra.nixos.org/job/nixos/release-15.09/tested#tabs-constituents)

 Communication:

-* [Discourse Forum](https://discourse.nixos.org/)
+* [Mailing list](http://lists.science.uu.nl/mailman/listinfo/nix-dev)
 * [IRC - #nixos on freenode.net](irc://irc.freenode.net/#nixos)
--- a/default.nix
+++ b/default.nix
@@ -2,27 +2,8 @@ let requiredVersion = import ./lib/minver.nix; in

 if ! builtins ? nixVersion || builtins.compareVersions requiredVersion builtins.nixVersion == 1 then

-  abort ''
-
-    This version of Nixpkgs requires Nix >= ${requiredVersion}, please upgrade:
-
-    - If you are running NixOS, `nixos-rebuild' can be used to upgrade your system.
-
-    - Alternatively, with Nix > 2.0 `nix upgrade-nix' can be used to imperatively
-      upgrade Nix. You may use `nix-env --version' to check which version you have.
-
-    - If you installed Nix using the install script (https://nixos.org/nix/install),
-      it is safe to upgrade by running it again:
-
-          curl https://nixos.org/nix/install | sh
-
-    For more information, please see the NixOS release notes at
-    https://nixos.org/nixos/manual or locally at
-    ${toString ./doc/manual/release-notes}.
-
-    If you need further help, see https://nixos.org/nixos/support.html
-  ''
+  abort "This version of Nixpkgs requires Nix >= ${requiredVersion}, please upgrade! See https://nixos.org/wiki/How_to_update_when_Nix_is_too_old_to_evaluate_Nixpkgs"

 else

-  import ./pkgs/top-level/impure.nix
+  import ./pkgs/top-level/all-packages.nix
--- a/doc/.gitignore
+++ b/doc/.gitignore
@@ -1,7 +0,0 @@
-*.chapter.xml
-*.section.xml
-.version
-out
-manual-full.xml
-highlightjs
-functions/library/locations.xml
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -1,104 +0,0 @@
-MD_TARGETS=$(addsuffix .xml, $(basename $(wildcard ./*.md ./**/*.md)))
-
-.PHONY: all
-all: validate format out/html/index.html out/epub/manual.epub
-
-.PHONY: debug
-debug:
-	nix-shell --run "xmloscopy --docbook5 ./manual.xml ./manual-full.xml"
-
-.PHONY: format
-format:
-	find . -iname '*.xml' -type f -print0 | xargs -0 -I{} -n1 \
-		xmlformat --config-file "$$XMLFORMAT_CONFIG" -i {}
-
-.PHONY: fix-misc-xml
-fix-misc-xml:
-	find . -iname '*.xml' -type f \
-		-exec ../nixos/doc/varlistentry-fixer.rb {} ';'
-
-.PHONY: clean
-clean:
-	rm -f ${MD_TARGETS} .version manual-full.xml functions/library/locations.xml
-	rm -rf ./out/ ./highlightjs
-
-.PHONY: validate
-validate: manual-full.xml
-	jing "$$RNG" manual-full.xml
-
-out/html/index.html: manual-full.xml style.css highlightjs
-	mkdir -p out/html
-	xsltproc ${xsltFlags} \
-		--nonet --xinclude \
-		--output $@ \
-		"$$XSL/docbook/xhtml/docbook.xsl" \
-		./manual-full.xml
-
-	mkdir -p out/html/highlightjs/
-	cp -r highlightjs out/html/
-
-	cp ./overrides.css out/html/
-	cp ./style.css out/html/style.css
-
-	mkdir -p out/html/images/callouts
-	cp "$$XSL/docbook/images/callouts/"*.svg out/html/images/callouts/
-	chmod u+w -R out/html/
-
-out/epub/manual.epub: manual-full.xml
-	mkdir -p out/epub/scratch
-	xsltproc ${xsltFlags} --nonet \
-		--output out/epub/scratch/ \
-		"$$XSL/docbook/epub/docbook.xsl" \
-		./manual-full.xml
-
-	cp ./overrides.css out/epub/scratch/OEBPS
-	cp ./style.css out/epub/scratch/OEBPS
-	mkdir -p out/epub/scratch/OEBPS/images/callouts/
-	cp "$$XSL/docbook/images/callouts/"*.svg out/epub/scratch/OEBPS/images/callouts/
-	echo "application/epub+zip" > mimetype
-	zip -0Xq "out/epub/manual.epub" mimetype
-	rm mimetype
-	cd "out/epub/scratch/" && zip -Xr9D "../manual.epub" *
-	rm -rf "out/epub/scratch/"
-
-highlightjs:
-	mkdir -p highlightjs
-	cp -r "$$HIGHLIGHTJS/highlight.pack.js" highlightjs/
-	cp -r "$$HIGHLIGHTJS/LICENSE" highlightjs/
-	cp -r "$$HIGHLIGHTJS/mono-blue.css" highlightjs/
-	cp -r "$$HIGHLIGHTJS/loader.js" highlightjs/
-
-
-manual-full.xml: ${MD_TARGETS} .version functions/library/locations.xml *.xml **/*.xml **/**/*.xml
-	xmllint --nonet --xinclude --noxincludenode manual.xml --output manual-full.xml
-
-.version:
-	nix-instantiate --eval \
-		-E '(import ../lib).version' > .version
-
-functions/library/locations.xml:
-	nix-build ./lib-function-locations.nix \
-		--out-link ./functions/library/locations.xml
-
-%.section.xml: %.section.md
-	pandoc $^ -w docbook+smart \
-		-f markdown+smart \
-	  | sed -e 's|<ulink url=|<link xlink:href=|' \
-	      -e 's|</ulink>|</link>|' \
-	      -e 's|<sect. id=|<section xml:id=|' \
-	      -e 's|</sect[0-9]>|</section>|' \
-	      -e '1s| id=| xml:id=|' \
-	      -e '1s|\(<[^ ]* \)|\1xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" |' \
-	| cat  > $@
-
-%.chapter.xml: %.chapter.md
-	pandoc $^ -w docbook+smart \
-		--top-level-division=chapter \
-		-f markdown+smart \
-	  | sed -e 's|<ulink url=|<link xlink:href=|' \
-	      -e 's|</ulink>|</link>|' \
-	      -e 's|<sect. id=|<section xml:id=|' \
-	      -e 's|</sect[0-9]>|</section>|' \
-	      -e '1s| id=| xml:id=|' \
-	      -e '1s|\(<[^ ]* \)|\1|' \
-	| cat  > $@
--- a/doc/coding-conventions.xml
+++ b/doc/coding-conventions.xml
--- a/doc/configuration.xml
+++ b/doc/configuration.xml
@@ -1,294 +1,98 @@
 <chapter xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="chap-packageconfig">
- <title>Global configuration</title>
- <para>
-  Nix comes with certain defaults about what packages can and cannot be
-  installed, based on a package's metadata. By default, Nix will prevent
-  installation if any of the following criteria are true:
- </para>
- <itemizedlist>
-  <listitem>
-   <para>
-    The package is thought to be broken, and has had its
-    <literal>meta.broken</literal> set to <literal>true</literal>.
-   </para>
-  </listitem>
-  <listitem>
-   <para>
-    The package isn't intended to run on the given system, as none of its
-    <literal>meta.platforms</literal> match the given system.
-   </para>
-  </listitem>
-  <listitem>
-   <para>
-    The package's <literal>meta.license</literal> is set to a license which is
-    considered to be unfree.
-   </para>
-  </listitem>
-  <listitem>
-   <para>
-    The package has known security vulnerabilities but has not or can not be
-    updated for some reason, and a list of issues has been entered in to the
-    package's <literal>meta.knownVulnerabilities</literal>.
-   </para>
-  </listitem>
- </itemizedlist>
- <para>
-  Note that all this is checked during evaluation already, and the check
-  includes any package that is evaluated. In particular, all build-time
-  dependencies are checked. <literal>nix-env -qa</literal> will (attempt to)
-  hide any packages that would be refused.
- </para>
- <para>
-  Each of these criteria can be altered in the nixpkgs configuration.
- </para>
- <para>
-  The nixpkgs configuration for a NixOS system is set in the
-  <literal>configuration.nix</literal>, as in the following example:
-<programlisting>
-{
-  nixpkgs.config = {
-    allowUnfree = true;
-  };
-}
-</programlisting>
-  However, this does not allow unfree software for individual users. Their
-  configurations are managed separately.
- </para>
- <para>
-  A user's of nixpkgs configuration is stored in a user-specific configuration
-  file located at <filename>~/.config/nixpkgs/config.nix</filename>. For
-  example:
+
+<title><filename>~/.nixpkgs/config.nix</filename>: global configuration</title>
+
+<para>Nix packages can be configured to allow or deny certain options.</para>
+
+<para>To apply the configuration edit
+<filename>~/.nixpkgs/config.nix</filename> and set it like
+
 <programlisting>
 {
  allowUnfree = true;
 }
 </programlisting>
- </para>
- <para>
-  Note that we are not able to test or build unfree software on Hydra due to
-  policy. Most unfree licenses prohibit us from either executing or
-  distributing the software.
- </para>
- <section xml:id="sec-allow-broken">
-  <title>Installing broken packages</title>

-  <para>
-   There are two ways to try compiling a package which has been marked as
-   broken.
-  </para>
+and will allow the Nix package manager to install unfree licensed packages.</para>
+
+<para>The configuration as listed also applies to NixOS under
+<option>nixpkgs.config</option> set.</para>
+
+<itemizedlist>
+
+  <listitem>
+    <para>Allow installing of packages that are distributed under
+    unfree license by setting <programlisting>allowUnfree =
+    true;</programlisting> or deny them by setting it to
+    <literal>false</literal>.</para>
+
+    <para>Same can be achieved by setting the environment variable:

-  <itemizedlist>
-   <listitem>
-    <para>
-     For allowing the build of a broken package once, you can use an
-     environment variable for a single invocation of the nix tools:
-<programlisting>$ export NIXPKGS_ALLOW_BROKEN=1</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     For permanently allowing broken packages to be built, you may add
-     <literal>allowBroken = true;</literal> to your user's configuration file,
-     like this:
 <programlisting>
-{
-  allowBroken = true;
-}
+$ export NIXPKGS_ALLOW_UNFREE=1
+</programlisting>
+
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>Whenever unfree packages are not allowed, single packages
+    can still be allowed by a predicate function that accepts package
+    as an argument and should return a boolean:
+
+<programlisting>
+allowUnfreePredicate = (pkg: ...);
+</programlisting>
+
+    Example to allow flash player only:
+
+<programlisting>
+allowUnfreePredicate = (pkg: pkgs.lib.hasPrefix "flashplayer-" pkg.name);
+</programlisting>
+
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>Whenever unfree packages are not allowed, packages can still
+    be whitelisted by their license:
+
+<programlisting>
+whitelistedLicenses = with stdenv.lib.licenses; [ amd wtfpl ];
 </programlisting>
    </para>
-   </listitem>
-  </itemizedlist>
- </section>
- <section xml:id="sec-allow-unsupported-system">
-  <title>Installing packages on unsupported systems</title>
+  </listitem>

-  <para>
-   There are also two ways to try compiling a package which has been marked as
-   unsuported for the given system.
-  </para>
+  <listitem>
+    <para>In addition to whitelisting licenses which are denied by the
+    <literal>allowUnfree</literal> setting, you can also explicitely
+    deny installation of packages which have a certain license:

-  <itemizedlist>
-   <listitem>
-    <para>
-     For allowing the build of a broken package once, you can use an
-     environment variable for a single invocation of the nix tools:
-<programlisting>$ export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     For permanently allowing broken packages to be built, you may add
-     <literal>allowUnsupportedSystem = true;</literal> to your user's
-     configuration file, like this:
 <programlisting>
-{
-  allowUnsupportedSystem = true;
-}
+blacklistedLicenses = with stdenv.lib.licenses; [ agpl3 gpl3 ];
 </programlisting>
    </para>
-   </listitem>
-  </itemizedlist>
+  </listitem>

-  <para>
-   The difference between an a package being unsupported on some system and
-   being broken is admittedly a bit fuzzy. If a program
-   <emphasis>ought</emphasis> to work on a certain platform, but doesn't, the
-   platform should be included in <literal>meta.platforms</literal>, but marked
-   as broken with e.g. <literal>meta.broken =
-   !hostPlatform.isWindows</literal>. Of course, this begs the question of what
-   "ought" means exactly. That is left to the package maintainer.
-  </para>
- </section>
- <section xml:id="sec-allow-unfree">
-  <title>Installing unfree packages</title>
+</itemizedlist>

-  <para>
-   There are several ways to tweak how Nix handles a package which has been
-   marked as unfree.
-  </para>
+<para>A complete list of licenses can be found in the file
+<filename>lib/licenses.nix</filename> of the nix package tree.</para>

-  <itemizedlist>
-   <listitem>
-    <para>
-     To temporarily allow all unfree packages, you can use an environment
-     variable for a single invocation of the nix tools:
-<programlisting>$ export NIXPKGS_ALLOW_UNFREE=1</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It is possible to permanently allow individual unfree packages, while
-     still blocking unfree packages by default using the
-     <literal>allowUnfreePredicate</literal> configuration option in the user
-     configuration file.
-    </para>
-    <para>
-     This option is a function which accepts a package as a parameter, and
-     returns a boolean. The following example configuration accepts a package
-     and always returns false:
-<programlisting>
-{
-  allowUnfreePredicate = (pkg: false);
-}
-</programlisting>
-    </para>
-    <para>
-     A more useful example, the following configuration allows only allows
-     flash player and visual studio code:
-<programlisting>
-{
-  allowUnfreePredicate = (pkg: elem (builtins.parseDrvName pkg.name).name [ "flashplayer" "vscode" ]);
-}
-</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It is also possible to whitelist and blacklist licenses that are
-     specifically acceptable or not acceptable, using
-     <literal>whitelistedLicenses</literal> and
-     <literal>blacklistedLicenses</literal>, respectively.
-    </para>
-    <para>
-     The following example configuration whitelists the licenses
-     <literal>amd</literal> and <literal>wtfpl</literal>:
-<programlisting>
-{
-  whitelistedLicenses = with stdenv.lib.licenses; [ amd wtfpl ];
-}
-</programlisting>
-    </para>
-    <para>
-     The following example configuration blacklists the <literal>gpl3</literal>
-     and <literal>agpl3</literal> licenses:
-<programlisting>
-{
-  blacklistedLicenses = with stdenv.lib.licenses; [ agpl3 gpl3 ];
-}
-</programlisting>
-    </para>
-   </listitem>
-  </itemizedlist>

-  <para>
-   A complete list of licenses can be found in the file
-   <filename>lib/licenses.nix</filename> of the nixpkgs tree.
-  </para>
- </section>
- <section xml:id="sec-allow-insecure">
-  <title>Installing insecure packages</title>
-
-  <para>
-   There are several ways to tweak how Nix handles a package which has been
-   marked as insecure.
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     To temporarily allow all insecure packages, you can use an environment
-     variable for a single invocation of the nix tools:
-<programlisting>$ export NIXPKGS_ALLOW_INSECURE=1</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It is possible to permanently allow individual insecure packages, while
-     still blocking other insecure packages by default using the
-     <literal>permittedInsecurePackages</literal> configuration option in the
-     user configuration file.
-    </para>
-    <para>
-     The following example configuration permits the installation of the
-     hypothetically insecure package <literal>hello</literal>, version
-     <literal>1.2.3</literal>:
-<programlisting>
-{
-  permittedInsecurePackages = [
-    "hello-1.2.3"
-  ];
-}
-</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It is also possible to create a custom policy around which insecure
-     packages to allow and deny, by overriding the
-     <literal>allowInsecurePredicate</literal> configuration option.
-    </para>
-    <para>
-     The <literal>allowInsecurePredicate</literal> option is a function which
-     accepts a package and returns a boolean, much like
-     <literal>allowUnfreePredicate</literal>.
-    </para>
-    <para>
-     The following configuration example only allows insecure packages with
-     very short names:
-<programlisting>
-{
-  allowInsecurePredicate = (pkg: (builtins.stringLength (builtins.parseDrvName pkg.name).name) &lt;= 5);
-}
-</programlisting>
-    </para>
-    <para>
-     Note that <literal>permittedInsecurePackages</literal> is only checked if
-     <literal>allowInsecurePredicate</literal> is not specified.
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
 <!--============================================================-->
- <section xml:id="sec-modify-via-packageOverrides">
-  <title>Modify packages via <literal>packageOverrides</literal></title>

-  <para>
-   You can define a function called <varname>packageOverrides</varname> in your
-   local <filename>~/.config/nixpkgs/config.nix</filename> to override nix
-   packages. It must be a function that takes pkgs as an argument and return
-   modified set of packages.
+<section xml:id="sec-modify-via-packageOverrides"><title>Modify
+packages via <literal>packageOverrides</literal></title>
+
+<para>You can define a function called
+<varname>packageOverrides</varname> in your local
+<filename>~/.nixpkgs/config.nix</filename> to overide nix packages.  It
+must be a function that takes pkgs as an argument and return modified
+set of packages.
+
 <programlisting>
 {
  packageOverrides = pkgs: rec {
@@ -296,214 +100,10 @@
  };
 }
 </programlisting>
-  </para>
- </section>
- <section xml:id="sec-declarative-package-management">
-  <title>Declarative Package Management</title>

-  <section xml:id="sec-building-environment">
-   <title>Build an environment</title>
+</para>

-   <para>
-    Using <literal>packageOverrides</literal>, it is possible to manage
-    packages declaratively. This means that we can list all of our desired
-    packages within a declarative Nix expression. For example, to have
-    <literal>aspell</literal>, <literal>bc</literal>,
-    <literal>ffmpeg</literal>, <literal>coreutils</literal>,
-    <literal>gdb</literal>, <literal>nixUnstable</literal>,
-    <literal>emscripten</literal>, <literal>jq</literal>,
-    <literal>nox</literal>, and <literal>silver-searcher</literal>, we could
-    use the following in <filename>~/.config/nixpkgs/config.nix</filename>:
-   </para>
+</section>

-<screen>
-{
-  packageOverrides = pkgs: with pkgs; {
-    myPackages = pkgs.buildEnv {
-      name = "my-packages";
-      paths = [ aspell bc coreutils gdb ffmpeg nixUnstable emscripten jq nox silver-searcher ];
-    };
-  };
-}
-    </screen>

-   <para>
-    To install it into our environment, you can just run <literal>nix-env -iA
-    nixpkgs.myPackages</literal>. If you want to load the packages to be built
-    from a working copy of <literal>nixpkgs</literal> you just run
-    <literal>nix-env -f. -iA myPackages</literal>. To explore what's been
-    installed, just look through <filename>~/.nix-profile/</filename>. You can
-    see that a lot of stuff has been installed. Some of this stuff is useful
-    some of it isn't. Let's tell Nixpkgs to only link the stuff that we want:
-   </para>
-
-<screen>
-{
-  packageOverrides = pkgs: with pkgs; {
-    myPackages = pkgs.buildEnv {
-      name = "my-packages";
-      paths = [ aspell bc coreutils gdb ffmpeg nixUnstable emscripten jq nox silver-searcher ];
-      pathsToLink = [ "/share" "/bin" ];
-    };
-  };
-}
-    </screen>
-
-   <para>
-    <literal>pathsToLink</literal> tells Nixpkgs to only link the paths listed
-    which gets rid of the extra stuff in the profile. <filename>/bin</filename>
-    and <filename>/share</filename> are good defaults for a user environment,
-    getting rid of the clutter. If you are running on Nix on MacOS, you may
-    want to add another path as well, <filename>/Applications</filename>, that
-    makes GUI apps available.
-   </para>
-  </section>
-
-  <section xml:id="sec-getting-documentation">
-   <title>Getting documentation</title>
-
-   <para>
-    After building that new environment, look through
-    <filename>~/.nix-profile</filename> to make sure everything is there that
-    we wanted. Discerning readers will note that some files are missing. Look
-    inside <filename>~/.nix-profile/share/man/man1/</filename> to verify this.
-    There are no man pages for any of the Nix tools! This is because some
-    packages like Nix have multiple outputs for things like documentation (see
-    section 4). Let's make Nix install those as well.
-   </para>
-
-<screen>
-{
-  packageOverrides = pkgs: with pkgs; {
-    myPackages = pkgs.buildEnv {
-      name = "my-packages";
-      paths = [ aspell bc coreutils ffmpeg nixUnstable emscripten jq nox silver-searcher ];
-      pathsToLink = [ "/share/man" "/share/doc" "/bin" ];
-      extraOutputsToInstall = [ "man" "doc" ];
-    };
-  };
-}
-    </screen>
-
-   <para>
-    This provides us with some useful documentation for using our packages.
-    However, if we actually want those manpages to be detected by man, we need
-    to set up our environment. This can also be managed within Nix expressions.
-   </para>
-
-<screen>
-{
-  packageOverrides = pkgs: with pkgs; rec {
-    myProfile = writeText "my-profile" ''
-export PATH=$HOME/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/sbin:/bin:/usr/sbin:/usr/bin
-export MANPATH=$HOME/.nix-profile/share/man:/nix/var/nix/profiles/default/share/man:/usr/share/man
-    '';
-    myPackages = pkgs.buildEnv {
-      name = "my-packages";
-      paths = [
-        (runCommand "profile" {} ''
-mkdir -p $out/etc/profile.d
-cp ${myProfile} $out/etc/profile.d/my-profile.sh
-        '')
-        aspell
-        bc
-        coreutils
-        ffmpeg
-        man
-        nixUnstable
-        emscripten
-        jq
-        nox
-        silver-searcher
-      ];
-      pathsToLink = [ "/share/man" "/share/doc" "/bin" "/etc" ];
-      extraOutputsToInstall = [ "man" "doc" ];
-    };
-  };
-}
-    </screen>
-
-   <para>
-    For this to work fully, you must also have this script sourced when you are
-    logged in. Try adding something like this to your
-    <filename>~/.profile</filename> file:
-   </para>
-
-<screen>
-#!/bin/sh
-if [ -d $HOME/.nix-profile/etc/profile.d ]; then
-  for i in $HOME/.nix-profile/etc/profile.d/*.sh; do
-    if [ -r $i ]; then
-      . $i
-    fi
-  done
-fi
-    </screen>
-
-   <para>
-    Now just run <literal>source $HOME/.profile</literal> and you can starting
-    loading man pages from your environent.
-   </para>
-  </section>
-
-  <section xml:id="sec-gnu-info-setup">
-   <title>GNU info setup</title>
-
-   <para>
-    Configuring GNU info is a little bit trickier than man pages. To work
-    correctly, info needs a database to be generated. This can be done with
-    some small modifications to our environment scripts.
-   </para>
-
-<screen>
-{
-  packageOverrides = pkgs: with pkgs; rec {
-    myProfile = writeText "my-profile" ''
-export PATH=$HOME/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/sbin:/bin:/usr/sbin:/usr/bin
-export MANPATH=$HOME/.nix-profile/share/man:/nix/var/nix/profiles/default/share/man:/usr/share/man
-export INFOPATH=$HOME/.nix-profile/share/info:/nix/var/nix/profiles/default/share/info:/usr/share/info
-    '';
-    myPackages = pkgs.buildEnv {
-      name = "my-packages";
-      paths = [
-        (runCommand "profile" {} ''
-mkdir -p $out/etc/profile.d
-cp ${myProfile} $out/etc/profile.d/my-profile.sh
-        '')
-        aspell
-        bc
-        coreutils
-        ffmpeg
-        man
-        nixUnstable
-        emscripten
-        jq
-        nox
-        silver-searcher
-        texinfoInteractive
-      ];
-      pathsToLink = [ "/share/man" "/share/doc" "/share/info" "/bin" "/etc" ];
-      extraOutputsToInstall = [ "man" "doc" "info" ];
-      postBuild = ''
-          if [ -x $out/bin/install-info -a -w $out/share/info ]; then
-            shopt -s nullglob
-            for i in $out/share/info/*.info $out/share/info/*.info.gz; do
-                $out/bin/install-info $i $out/share/info/dir
-            done
-          fi
-      '';
-    };
-  };
-}
-    </screen>
-
-   <para>
-    <literal>postBuild</literal> tells Nixpkgs to run a command after building
-    the environment. In this case, <literal>install-info</literal> adds the
-    installed info pages to <literal>dir</literal> which is GNU info's default
-    root node. Note that <literal>texinfoInteractive</literal> is added to the
-    environment to give the <literal>install-info</literal> command.
-   </para>
-  </section>
- </section>
 </chapter>
--- a/doc/contributing.xml
+++ b/doc/contributing.xml
@@ -1,35 +1,20 @@
 <chapter xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="chap-contributing">
- <title>Contributing to this documentation</title>
- <para>
-  The DocBook sources of the Nixpkgs manual are in the
-  <filename
+
+<title>Contributing to this documentation</title>
+
+<para>The DocBook sources of the Nixpkgs manual are in the <filename
 xlink:href="https://github.com/NixOS/nixpkgs/tree/master/doc">doc</filename>
-  subdirectory of the Nixpkgs repository.
- </para>
- <para>
-  You can quickly check your edits with <command>make</command>:
- </para>
+subdirectory of the Nixpkgs repository. If you make modifications to
+the manual, it's important to build it before committing. You can do that as follows:
+
 <screen>
-  $ cd /path/to/nixpkgs/doc
-  $ nix-shell
-  [nix-shell]$ make
+$ cd /path/to/nixpkgs
+$ nix-build doc
 </screen>
- <para>
-  If you experience problems, run <command>make debug</command> to help
-  understand the docbook errors.
- </para>
- <para>
-  After making modifications to the manual, it's important to build it before
-  committing. You can do that as follows:
-<screen>
-  $ cd /path/to/nixpkgs/doc
-  $ nix-shell
-  [nix-shell]$ make clean
-  [nix-shell]$ nix-build .
-</screen>
-  If the build succeeds, the manual will be in
-  <filename>./result/share/doc/nixpkgs/manual.html</filename>.
- </para>
+
+If the build succeeds, the manual will be in
+<filename>./result/share/doc/nixpkgs/manual.html</filename>.</para>
+
 </chapter>
--- a/doc/cross-compilation.xml
+++ b/doc/cross-compilation.xml
@@ -1,475 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="chap-cross">
- <title>Cross-compilation</title>
- <section xml:id="sec-cross-intro">
-  <title>Introduction</title>
-
-  <para>
-   "Cross-compilation" means compiling a program on one machine for another
-   type of machine. For example, a typical use of cross compilation is to
-   compile programs for embedded devices. These devices often don't have the
-   computing power and memory to compile their own programs. One might think
-   that cross-compilation is a fairly niche concern, but there are advantages
-   to being rigorous about distinguishing build-time vs run-time environments
-   even when one is developing and deploying on the same machine. Nixpkgs is
-   increasingly adopting the opinion that packages should be written with
-   cross-compilation in mind, and nixpkgs should evaluate in a similar way (by
-   minimizing cross-compilation-specific special cases) whether or not one is
-   cross-compiling.
-  </para>
-
-  <para>
-   This chapter will be organized in three parts. First, it will describe the
-   basics of how to package software in a way that supports cross-compilation.
-   Second, it will describe how to use Nixpkgs when cross-compiling. Third, it
-   will describe the internal infrastructure supporting cross-compilation.
-  </para>
- </section>
-<!--============================================================-->
- <section xml:id="sec-cross-packaging">
-  <title>Packaging in a cross-friendly manner</title>
-
-  <section xml:id="sec-cross-platform-parameters">
-   <title>Platform parameters</title>
-
-   <para>
-    Nixpkgs follows the
-    <link xlink:href="https://gcc.gnu.org/onlinedocs/gccint/Configure-Terms.html">common
-    historical convention of GNU autoconf</link> of distinguishing between 3
-    types of platform: <wordasword>build</wordasword>,
-    <wordasword>host</wordasword>, and <wordasword>target</wordasword>. In
-    summary, <wordasword>build</wordasword> is the platform on which a package
-    is being built, <wordasword>host</wordasword> is the platform on which it
-    is to run. The third attribute, <wordasword>target</wordasword>, is
-    relevant only for certain specific compilers and build tools.
-   </para>
-
-   <para>
-    In Nixpkgs, these three platforms are defined as attribute sets under the
-    names <literal>buildPlatform</literal>, <literal>hostPlatform</literal>,
-    and <literal>targetPlatform</literal>. They are always defined as
-    attributes in the standard environment. That means one can access them
-    like:
-<programlisting>{ stdenv, fooDep, barDep, .. }: ...stdenv.buildPlatform...</programlisting>
-    .
-   </para>
-
-   <variablelist>
-    <varlistentry>
-     <term>
-      <varname>buildPlatform</varname>
-     </term>
-     <listitem>
-      <para>
-       The "build platform" is the platform on which a package is built. Once
-       someone has a built package, or pre-built binary package, the build
-       platform should not matter and be safe to ignore.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>hostPlatform</varname>
-     </term>
-     <listitem>
-      <para>
-       The "host platform" is the platform on which a package will be run. This
-       is the simplest platform to understand, but also the one with the worst
-       name.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>targetPlatform</varname>
-     </term>
-     <listitem>
-      <para>
-       The "target platform" attribute is, unlike the other two attributes, not
-       actually fundamental to the process of building software. Instead, it is
-       only relevant for compatibility with building certain specific compilers
-       and build tools. It can be safely ignored for all other packages.
-      </para>
-      <para>
-       The build process of certain compilers is written in such a way that the
-       compiler resulting from a single build can itself only produce binaries
-       for a single platform. The task specifying this single "target platform"
-       is thus pushed to build time of the compiler. The root cause of this
-       mistake is often that the compiler (which will be run on the host) and
-       the the standard library/runtime (which will be run on the target) are
-       built by a single build process.
-      </para>
-      <para>
-       There is no fundamental need to think about a single target ahead of
-       time like this. If the tool supports modular or pluggable backends, both
-       the need to specify the target at build time and the constraint of
-       having only a single target disappear. An example of such a tool is
-       LLVM.
-      </para>
-      <para>
-       Although the existence of a "target platfom" is arguably a historical
-       mistake, it is a common one: examples of tools that suffer from it are
-       GCC, Binutils, GHC and Autoconf. Nixpkgs tries to avoid sharing in the
-       mistake where possible. Still, because the concept of a target platform
-       is so ingrained, it is best to support it as is.
-      </para>
-     </listitem>
-    </varlistentry>
-   </variablelist>
-
-   <para>
-    The exact schema these fields follow is a bit ill-defined due to a long and
-    convoluted evolution, but this is slowly being cleaned up. You can see
-    examples of ones used in practice in
-    <literal>lib.systems.examples</literal>; note how they are not all very
-    consistent. For now, here are few fields can count on them containing:
-   </para>
-
-   <variablelist>
-    <varlistentry>
-     <term>
-      <varname>system</varname>
-     </term>
-     <listitem>
-      <para>
-       This is a two-component shorthand for the platform. Examples of this
-       would be "x86_64-darwin" and "i686-linux"; see
-       <literal>lib.systems.doubles</literal> for more. This format isn't very
-       standard, but has built-in support in Nix, such as the
-       <varname>builtins.currentSystem</varname> impure string.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>config</varname>
-     </term>
-     <listitem>
-      <para>
-       This is a 3- or 4- component shorthand for the platform. Examples of
-       this would be "x86_64-unknown-linux-gnu" and "aarch64-apple-darwin14".
-       This is a standard format called the "LLVM target triple", as they are
-       pioneered by LLVM and traditionally just used for the
-       <varname>targetPlatform</varname>. This format is strictly more
-       informative than the "Nix host double", as the previous format could
-       analogously be termed. This needs a better name than
-       <varname>config</varname>!
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>parsed</varname>
-     </term>
-     <listitem>
-      <para>
-       This is a nix representation of a parsed LLVM target triple with
-       white-listed components. This can be specified directly, or actually
-       parsed from the <varname>config</varname>. [Technically, only one need
-       be specified and the others can be inferred, though the precision of
-       inference may not be very good.] See
-       <literal>lib.systems.parse</literal> for the exact representation.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>libc</varname>
-     </term>
-     <listitem>
-      <para>
-       This is a string identifying the standard C library used. Valid
-       identifiers include "glibc" for GNU libc, "libSystem" for Darwin's
-       Libsystem, and "uclibc" for µClibc. It should probably be refactored to
-       use the module system, like <varname>parse</varname>.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>is*</varname>
-     </term>
-     <listitem>
-      <para>
-       These predicates are defined in <literal>lib.systems.inspect</literal>,
-       and slapped on every platform. They are superior to the ones in
-       <varname>stdenv</varname> as they force the user to be explicit about
-       which platform they are inspecting. Please use these instead of those.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>platform</varname>
-     </term>
-     <listitem>
-      <para>
-       This is, quite frankly, a dumping ground of ad-hoc settings (it's an
-       attribute set). See <literal>lib.systems.platforms</literal> for
-       examples—there's hopefully one in there that will work verbatim for
-       each platform that is working. Please help us triage these flags and
-       give them better homes!
-      </para>
-     </listitem>
-    </varlistentry>
-   </variablelist>
-  </section>
-
-  <section xml:id="sec-cross-specifying-dependencies">
-   <title>Specifying Dependencies</title>
-
-   <para>
-    In this section we explore the relationship between both runtime and
-    buildtime dependencies and the 3 Autoconf platforms.
-   </para>
-
-   <para>
-    A runtime dependency between 2 packages implies that between them both the
-    host and target platforms match. This is directly implied by the meaning of
-    "host platform" and "runtime dependency": The package dependency exists
-    while both packages are running on a single host platform.
-   </para>
-
-   <para>
-    A build time dependency, however, implies a shift in platforms between the
-    depending package and the depended-on package. The meaning of a build time
-    dependency is that to build the depending package we need to be able to run
-    the depended-on's package. The depending package's build platform is
-    therefore equal to the depended-on package's host platform. Analogously,
-    the depending package's host platform is equal to the depended-on package's
-    target platform.
-   </para>
-
-   <para>
-    In this manner, given the 3 platforms for one package, we can determine the
-    three platforms for all its transitive dependencies. This is the most
-    important guiding principle behind cross-compilation with Nixpkgs, and will
-    be called the <wordasword>sliding window principle</wordasword>.
-   </para>
-
-   <para>
-    Some examples will probably make this clearer. If a package is being built
-    with a <literal>(build, host, target)</literal> platform triple of
-    <literal>(foo, bar, bar)</literal>, then its build-time dependencies would
-    have a triple of <literal>(foo, foo, bar)</literal>, and <emphasis>those
-    packages'</emphasis> build-time dependencies would have triple of
-    <literal>(foo, foo, foo)</literal>. In other words, it should take two
-    "rounds" of following build-time dependency edges before one reaches a
-    fixed point where, by the sliding window principle, the platform triple no
-    longer changes. Indeed, this happens with cross compilation, where only
-    rounds of native dependencies starting with the second necessarily coincide
-    with native packages.
-   </para>
-
-   <note>
-    <para>
-     The depending package's target platform is unconstrained by the sliding
-     window principle, which makes sense in that one can in principle build
-     cross compilers targeting arbitrary platforms.
-    </para>
-   </note>
-
-   <para>
-    How does this work in practice? Nixpkgs is now structured so that
-    build-time dependencies are taken from <varname>buildPackages</varname>,
-    whereas run-time dependencies are taken from the top level attribute set.
-    For example, <varname>buildPackages.gcc</varname> should be used at build
-    time, while <varname>gcc</varname> should be used at run time. Now, for
-    most of Nixpkgs's history, there was no <varname>buildPackages</varname>,
-    and most packages have not been refactored to use it explicitly. Instead,
-    one can use the six (<emphasis>gasp</emphasis>) attributes used for
-    specifying dependencies as documented in
-    <xref linkend="ssec-stdenv-dependencies"/>. We "splice" together the
-    run-time and build-time package sets with <varname>callPackage</varname>,
-    and then <varname>mkDerivation</varname> for each of four attributes pulls
-    the right derivation out. This splicing can be skipped when not cross
-    compiling as the package sets are the same, but is a bit slow for cross
-    compiling. Because of this, a best-of-both-worlds solution is in the works
-    with no splicing or explicit access of <varname>buildPackages</varname>
-    needed. For now, feel free to use either method.
-   </para>
-
-   <note>
-    <para>
-     There is also a "backlink" <varname>targetPackages</varname>, yielding a
-     package set whose <varname>buildPackages</varname> is the current package
-     set. This is a hack, though, to accommodate compilers with lousy build
-     systems. Please do not use this unless you are absolutely sure you are
-     packaging such a compiler and there is no other way.
-    </para>
-   </note>
-  </section>
-
-  <section xml:id="sec-cross-cookbook">
-   <title>Cross packaging cookbook</title>
-
-   <para>
-    Some frequently problems when packaging for cross compilation are good to
-    just spell and answer. Ideally the information above is exhaustive, so this
-    section cannot provide any new information, but its ludicrous and cruel to
-    expect everyone to spend effort working through the interaction of many
-    features just to figure out the same answer to the same common problem.
-    Feel free to add to this list!
-   </para>
-
-   <qandaset>
-    <qandaentry xml:id="cross-qa-build-c-program-in-build-environment">
-     <question>
-      <para>
-       What if my package's build system needs to build a C program to be run
-       under the build environment?
-      </para>
-     </question>
-     <answer>
-      <para>
-<programlisting>depsBuildBuild = [ buildPackages.stdenv.cc ];</programlisting>
-       Add it to your <function>mkDerivation</function> invocation.
-      </para>
-     </answer>
-    </qandaentry>
-    <qandaentry xml:id="cross-qa-fails-to-find-ar">
-     <question>
-      <para>
-       My package fails to find <command>ar</command>.
-      </para>
-     </question>
-     <answer>
-      <para>
-       Many packages assume that an unprefixed <command>ar</command> is
-       available, but Nix doesn't provide one. It only provides a prefixed one,
-       just as it only does for all the other binutils programs. It may be
-       necessary to patch the package to fix the build system to use a prefixed
-       `ar`.
-      </para>
-     </answer>
-    </qandaentry>
-    <qandaentry xml:id="cross-testsuite-runs-host-code">
-     <question>
-      <para>
-       My package's testsuite needs to run host platform code.
-      </para>
-     </question>
-     <answer>
-      <para>
-<programlisting>doCheck = stdenv.hostPlatform != stdenv.buildPlatfrom;</programlisting>
-       Add it to your <function>mkDerivation</function> invocation.
-      </para>
-     </answer>
-    </qandaentry>
-   </qandaset>
-  </section>
- </section>
-<!--============================================================-->
- <section xml:id="sec-cross-usage">
-  <title>Cross-building packages</title>
-
-  <note>
-   <para>
-    More information needs to moved from the old wiki, especially
-    <link xlink:href="https://nixos.org/wiki/CrossCompiling" />, for this
-    section.
-   </para>
-  </note>
-
-  <para>
-   Nixpkgs can be instantiated with <varname>localSystem</varname> alone, in
-   which case there is no cross compiling and everything is built by and for
-   that system, or also with <varname>crossSystem</varname>, in which case
-   packages run on the latter, but all building happens on the former. Both
-   parameters take the same schema as the 3 (build, host, and target) platforms
-   defined in the previous section. As mentioned above,
-   <literal>lib.systems.examples</literal> has some platforms which are used as
-   arguments for these parameters in practice. You can use them
-   programmatically, or on the command line:
-<programlisting>
-nix-build &lt;nixpkgs&gt; --arg crossSystem '(import &lt;nixpkgs/lib&gt;).systems.examples.fooBarBaz' -A whatever</programlisting>
-  </para>
-
-  <note>
-   <para>
-    Eventually we would like to make these platform examples an unnecessary
-    convenience so that
-<programlisting>
-nix-build &lt;nixpkgs&gt; --arg crossSystem.config '&lt;arch&gt;-&lt;os&gt;-&lt;vendor&gt;-&lt;abi&gt;' -A whatever</programlisting>
-    works in the vast majority of cases. The problem today is dependencies on
-    other sorts of configuration which aren't given proper defaults. We rely on
-    the examples to crudely to set those configuration parameters in some
-    vaguely sane manner on the users behalf. Issue
-    <link xlink:href="https://github.com/NixOS/nixpkgs/issues/34274">#34274</link>
-    tracks this inconvenience along with its root cause in crufty configuration
-    options.
-   </para>
-  </note>
-
-  <para>
-   While one is free to pass both parameters in full, there's a lot of logic to
-   fill in missing fields. As discussed in the previous section, only one of
-   <varname>system</varname>, <varname>config</varname>, and
-   <varname>parsed</varname> is needed to infer the other two. Additionally,
-   <varname>libc</varname> will be inferred from <varname>parse</varname>.
-   Finally, <literal>localSystem.system</literal> is also
-   <emphasis>impurely</emphasis> inferred based on the platform evaluation
-   occurs. This means it is often not necessary to pass
-   <varname>localSystem</varname> at all, as in the command-line example in the
-   previous paragraph.
-  </para>
-
-  <note>
-   <para>
-    Many sources (manual, wiki, etc) probably mention passing
-    <varname>system</varname>, <varname>platform</varname>, along with the
-    optional <varname>crossSystem</varname> to nixpkgs: <literal>import
-    &lt;nixpkgs&gt; { system = ..; platform = ..; crossSystem = ..;
-    }</literal>. Passing those two instead of <varname>localSystem</varname> is
-    still supported for compatibility, but is discouraged. Indeed, much of the
-    inference we do for these parameters is motivated by compatibility as much
-    as convenience.
-   </para>
-  </note>
-
-  <para>
-   One would think that <varname>localSystem</varname> and
-   <varname>crossSystem</varname> overlap horribly with the three
-   <varname>*Platforms</varname> (<varname>buildPlatform</varname>,
-   <varname>hostPlatform,</varname> and <varname>targetPlatform</varname>; see
-   <varname>stage.nix</varname> or the manual). Actually, those identifiers are
-   purposefully not used here to draw a subtle but important distinction: While
-   the granularity of having 3 platforms is necessary to properly *build*
-   packages, it is overkill for specifying the user's *intent* when making a
-   build plan or package set. A simple "build vs deploy" dichotomy is adequate:
-   the sliding window principle described in the previous section shows how to
-   interpolate between the these two "end points" to get the 3 platform triple
-   for each bootstrapping stage. That means for any package a given package
-   set, even those not bound on the top level but only reachable via
-   dependencies or <varname>buildPackages</varname>, the three platforms will
-   be defined as one of <varname>localSystem</varname> or
-   <varname>crossSystem</varname>, with the former replacing the latter as one
-   traverses build-time dependencies. A last simple difference then is
-   <varname>crossSystem</varname> should be null when one doesn't want to
-   cross-compile, while the <varname>*Platform</varname>s are always non-null.
-   <varname>localSystem</varname> is always non-null.
-  </para>
- </section>
-<!--============================================================-->
- <section xml:id="sec-cross-infra">
-  <title>Cross-compilation infrastructure</title>
-
-  <para>
-   To be written.
-  </para>
-
-  <note>
-   <para>
-    If one explores nixpkgs, they will see derivations with names like
-    <literal>gccCross</literal>. Such <literal>*Cross</literal> derivations is
-    a holdover from before we properly distinguished between the host and
-    target platforms —the derivation with "Cross" in the name covered the
-    <literal>build = host != target</literal> case, while the other covered the
-    <literal>host = target</literal>, with build platform the same or not based
-    on whether one was using its <literal>.nativeDrv</literal> or
-    <literal>.crossDrv</literal>. This ugliness will disappear soon.
-   </para>
-  </note>
- </section>
-</chapter>
--- a/doc/default.nix
+++ b/doc/default.nix
@@ -1,50 +1,85 @@
-{ pkgs ? (import ./.. { }), nixpkgs ? { }}:
+with import ./.. { };
+with lib;
 let
-  lib = pkgs.lib;
-  locationsXml = import ./lib-function-locations.nix { inherit pkgs nixpkgs; };
+  sources = sourceFilesBySuffices ./. [".xml"];
+  sources-langs = ./languages-frameworks;
 in
-pkgs.stdenv.mkDerivation {
+stdenv.mkDerivation {
  name = "nixpkgs-manual";

-  buildInputs = with pkgs; [ pandoc libxml2 libxslt zip jing  xmlformat ];

-  src = ./.;
+  buildInputs = [ pandoc libxml2 libxslt ];

-  # Hacking on these variables? Make sure to close and open
-  # nix-shell between each test, maybe even:
-  # $ nix-shell --run "make clean all"
-  # otherwise they won't reapply :)
-  HIGHLIGHTJS = pkgs.documentation-highlighter;
-  XSL = "${pkgs.docbook_xsl_ns}/xml/xsl";
-  RNG = "${pkgs.docbook5}/xml/rng/docbook/docbook.rng";
-  XMLFORMAT_CONFIG = ../nixos/doc/xmlformat.conf;
-  xsltFlags = lib.concatStringsSep " " [
-    "--param section.autolabel 1"
-    "--param section.label.includes.component.label 1"
-    "--stringparam html.stylesheet 'style.css overrides.css highlightjs/mono-blue.css'"
-    "--stringparam html.script './highlightjs/highlight.pack.js ./highlightjs/loader.js'"
-    "--param xref.with.number.and.title 1"
-    "--param toc.section.depth 3"
-    "--stringparam admon.style ''"
-    "--stringparam callout.graphics.extension .svg"
-  ];
-
-  postPatch = ''
-    rm -rf ./functions/library/locations.xml
-    ln -s ${locationsXml} ./functions/library/locations.xml
-    echo ${lib.version} > .version
+  xsltFlags = ''
+    --param section.autolabel 1
+    --param section.label.includes.component.label 1
+    --param html.stylesheet 'style.css'
+    --param xref.with.number.and.title 1
+    --param toc.section.depth 3
+    --param admon.style '''
+    --param callout.graphics.extension '.gif'
  '';

-  installPhase = ''
-    dest="$out/share/doc/nixpkgs"
-    mkdir -p "$(dirname "$dest")"
-    mv out/html "$dest"
-    mv "$dest/index.html" "$dest/manual.html"

-    mv out/epub/manual.epub "$dest/nixpkgs-manual.epub"
+  buildCommand = let toDocbook = { useChapters ? false, inputFile, outputFile }:
+    let
+      extraHeader = ''xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" '';
+    in ''
+      {
+        pandoc '${inputFile}' -w docbook ${optionalString useChapters "--chapters"} \
+          | sed -e 's|<ulink url=|<link xlink:href=|' \
+              -e 's|</ulink>|</link>|' \
+              -e 's|<sect. id=|<section xml:id=|' \
+              -e 's|</sect[0-9]>|</section>|' \
+              -e '1s| id=| xml:id=|' \
+              -e '1s|\(<[^ ]* \)|\1${extraHeader}|'
+      } > '${outputFile}'
+    '';
+  in

-    mkdir -p $out/nix-support/
-    echo "doc manual $dest manual.html" >> $out/nix-support/hydra-build-products
-    echo "doc manual $dest nixpkgs-manual.epub" >> $out/nix-support/hydra-build-products
+  ''
+    ln -s '${sources}/'*.xml .
+    mkdir ./languages-frameworks
+    cp -s '${sources-langs}'/* ./languages-frameworks
+  ''
+  + toDocbook {
+      inputFile = ./introduction.md;
+      outputFile = "introduction.xml";
+      useChapters = true;
+    }
+  + toDocbook {
+      inputFile = ./haskell-users-guide.md;
+      outputFile = "haskell-users-guide.xml";
+      useChapters = true;
+    }
+  + toDocbook {
+      inputFile = ./../pkgs/development/idris-modules/README.md;
+      outputFile = "languages-frameworks/idris.xml";
+    }
+  + toDocbook {
+      inputFile = ./../pkgs/development/r-modules/README.md;
+      outputFile = "languages-frameworks/r.xml";
+    }
+  + ''
+    echo ${nixpkgsVersion} > .version
+
+    # validate against relaxng schema
+    xmllint --nonet --xinclude --noxincludenode manual.xml --output manual-full.xml
+    ${jing}/bin/jing ${docbook5}/xml/rng/docbook/docbook.rng manual-full.xml
+
+    dst=$out/share/doc/nixpkgs
+    mkdir -p $dst
+    xsltproc $xsltFlags --nonet --xinclude \
+      --output $dst/manual.html \
+      ${docbook5_xsl}/xml/xsl/docbook/xhtml/docbook.xsl \
+      ./manual.xml
+
+    cp ${./style.css} $dst/style.css
+
+    mkdir -p $dst/images/callouts
+    cp "${docbook5_xsl}/xml/xsl/docbook/images/callouts/"*.gif $dst/images/callouts/
+
+    mkdir -p $out/nix-support
+    echo "doc manual $dst manual.html" >> $out/nix-support/hydra-build-products
  '';
 }
--- a/doc/erlang-users-guide.xml
+++ b/doc/erlang-users-guide.xml
@@ -0,0 +1,305 @@
+<chapter xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xml:id="users-guide-to-the-erlang-infrastructure">
+
+<title>User's Guide to the Erlang Infrastructure</title>
+<section xml:id="build-tools">
+  <title>Build Tools</title>
+  <para>
+    By default Rebar3 wants to manage it's own dependencies. In the
+    normal non-Nix, this is perfectly acceptable. In the Nix world it
+    is not. To support this we have created two versions of rebar3,
+    <literal>rebar3</literal> and <literal>rebar3-open</literal>. The
+    <literal>rebar3</literal> version has been patched to remove the
+    ability to download anything from it. If you are not running it a
+    nix-shell or a nix-build then its probably not going to work for
+    you. <literal>rebar3-open</literal> is the normal, un-modified
+    rebar3. It should work exactly as would any other version of
+    rebar3. Any Erlang package should rely on
+    <literal>rebar3</literal> and thats really what you should be
+    using too.
+  </para>
+</section>
+
+<section xml:id="how-to-install-erlang-packages">
+  <title>How to install Erlang packages</title>
+  <para>
+    Erlang packages are not registered in the top level simply because
+    they are not relevant to the vast majority of Nix users. They are
+    installable using the <literal>erlangPackages</literal> attribute set.
+
+    You can list the avialable packages in the
+    <literal>erlangPackages</literal> with the following command:
+  </para>
+
+  <programlisting>
+$ nix-env -f &quot;&lt;nixpkgs&gt;&quot; -qaP -A erlangPackages
+erlangPackages.esqlite    esqlite-0.2.1
+erlangPackages.goldrush   goldrush-0.1.7
+erlangPackages.ibrowse    ibrowse-4.2.2
+erlangPackages.jiffy      jiffy-0.14.5
+erlangPackages.lager      lager-3.0.2
+erlangPackages.meck       meck-0.8.3
+erlangPackages.rebar3-pc  pc-1.1.0
+  </programlisting>
+  <para>
+    To install any of those packages into your profile, refer to them by
+    their attribute path (first column):
+  </para>
+  <programlisting>
+$ nix-env -f &quot;&lt;nixpkgs&gt;&quot; -iA erlangPackages.ibrowse
+  </programlisting>
+  <para>
+    The attribute path of any Erlang packages corresponds to the name
+    of that particular package in Hex or its OTP Application/Release name.
+  </para>
+</section>
+<section xml:id="packaging-erlang-applications">
+  <title>Packaging Erlang Applications</title>
+  <section xml:id="rebar3-packages">
+    <title>Rebar3 Packages</title>
+    <para>
+      There is a Nix functional called
+      <literal>buildRebar3</literal>. We use this function to make a
+      derivation that understands how to build the rebar3 project. For
+      example, the epression we use to build the <link
+      xlink:href="https://github.com/erlang-nix/hex2nix">hex2nix</link>
+      project follows.
+    </para>
+    <programlisting>
+{stdenv, fetchFromGitHub, buildRebar3, ibrowse, jsx, erlware_commons }:
+
+buildRebar3 rec {
+    name = "hex2nix";
+    version = "0.0.1";
+
+    src = fetchFromGitHub {
+        owner = "ericbmerritt";
+        repo = "hex2nix";
+        rev = "${version}";
+        sha256 = "1w7xjidz1l5yjmhlplfx7kphmnpvqm67w99hd2m7kdixwdxq0zqg";
+    };
+
+    erlangDeps = [ ibrowse jsx erlware_commons ];
+}
+    </programlisting>
+    <para>
+      The only visible difference between this derivation and
+      something like <literal>stdenv.mkDerivation</literal> is that we
+      have added <literal>erlangDeps</literal> to the derivation. If
+      you add your Erlang dependencies here they will be correctly
+      handled by the system.
+    </para>
+    <para>
+      If your package needs to compile native code via Rebar's port
+      compilation mechenism. You should add <literal>compilePort =
+      true;</literal> to the derivation.
+    </para>
+  </section>
+
+  <section xml:id="hex-packages">
+    <title>Hex Packages</title>
+    <para>
+      Hex packages are based on Rebar packages. In fact, at the moment
+      we can only compile Hex packages that are buildable with
+      Rebar3. Packages that use Mix and other build systems are not
+      supported. That being said, we know a lot more about Hex and can
+      do more for you.
+    </para>
+    <programlisting>
+{ buildHex }:
+  buildHex {
+    name = "esqlite";
+    version = "0.2.1";
+    sha256 = "1296fn1lz4lz4zqzn4dwc3flgkh0i6n4sydg501faabfbv8d3wkr";
+    compilePort = true;
+}
+    </programlisting>
+    <para>
+      For Hex packages you need to provide the name, the version, and
+      the Sha 256 digest of the package and use
+      <literal>buildHex</literal> to build it. Obviously, the package
+      needs to have already been published to Hex.
+    </para>
+  </section>
+</section>
+<section xml:id="how-to-develop">
+  <title>How to develop</title>
+  <section xml:id="accessing-an-environment">
+    <title>Accessing an Environment</title>
+    <para>
+      Often, all you want to do is be able to access a valid
+      environment that contains a specific package and its
+      dependencies. we can do that with the <literal>env</literal>
+      part of a derivation. For example, lets say we want to access an
+      erlang repl with ibrowse loaded up. We could do the following.
+    </para>
+    <programlisting>
+      ~/w/nixpkgs ❯❯❯ nix-shell -A erlangPackages.ibrowse.env --run "erl"
+      Erlang/OTP 18 [erts-7.0] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]
+
+      Eshell V7.0  (abort with ^G)
+      1> m(ibrowse).
+      Module: ibrowse
+      MD5: 3b3e0137d0cbb28070146978a3392945
+      Compiled: January 10 2016, 23:34
+      Object file: /nix/store/g1rlf65rdgjs4abbyj4grp37ry7ywivj-ibrowse-4.2.2/lib/erlang/lib/ibrowse-4.2.2/ebin/ibrowse.beam
+      Compiler options:  [{outdir,"/tmp/nix-build-ibrowse-4.2.2.drv-0/hex-source-ibrowse-4.2.2/_build/default/lib/ibrowse/ebin"},
+      debug_info,debug_info,nowarn_shadow_vars,
+      warn_unused_import,warn_unused_vars,warnings_as_errors,
+      {i,"/tmp/nix-build-ibrowse-4.2.2.drv-0/hex-source-ibrowse-4.2.2/_build/default/lib/ibrowse/include"}]
+      Exports:
+      add_config/1                  send_req_direct/7
+      all_trace_off/0               set_dest/3
+      code_change/3                 set_max_attempts/3
+      get_config_value/1            set_max_pipeline_size/3
+      get_config_value/2            set_max_sessions/3
+      get_metrics/0                 show_dest_status/0
+      get_metrics/2                 show_dest_status/1
+      handle_call/3                 show_dest_status/2
+      handle_cast/2                 spawn_link_worker_process/1
+      handle_info/2                 spawn_link_worker_process/2
+      init/1                        spawn_worker_process/1
+      module_info/0                 spawn_worker_process/2
+      module_info/1                 start/0
+      rescan_config/0               start_link/0
+      rescan_config/1               stop/0
+      send_req/3                    stop_worker_process/1
+      send_req/4                    stream_close/1
+      send_req/5                    stream_next/1
+      send_req/6                    terminate/2
+      send_req_direct/4             trace_off/0
+      send_req_direct/5             trace_off/2
+      send_req_direct/6             trace_on/0
+      trace_on/2
+      ok
+      2>
+    </programlisting>
+    <para>
+      Notice the <literal>-A erlangPackages.ibrowse.env</literal>.That
+      is the key to this functionality.
+    </para>
+  </section>
+  <section xml:id="creating-a-shell">
+    <title>Creating a Shell</title>
+    <para>
+      Getting access to an environment often isn't enough to do real
+      development. Many times we need to create a
+      <literal>shell.nix</literal> file and do our development inside
+      of the environment specified by that file. This file looks a lot
+      like the packageing described above. The main difference is that
+      <literal>src</literal> points to project root and we call the
+      package directly.
+    </para>
+    <programlisting>
+{ pkgs ? import &quot;&lt;nixpkgs&quot;&gt; {} }:
+
+with pkgs;
+
+let
+
+  f = { buildHex, ibrowse, jsx, erlware_commons }:
+      buildHex {
+        name = "hex2nix";
+        version = "0.1.0";
+        src = ./.;
+        erlangDeps = [ ibrowse jsx erlware_commons ];
+      };
+  drv = erlangPackages.callPackage f {};
+
+in
+ drv
+    </programlisting>
+    <section xml:id="building-in-a-shell">
+    <title>Building in a shell</title>
+    <para>
+      Unfortunatly for us users of Nix, Rebar isn't very cooperative
+      with us from the standpoint of building a hermetic
+      environment. When building the rebar3 support we had to do some
+      sneaky things to get it not to go out and pull packages on its
+      own. Also unfortunately, you have to do some of the same things
+      when building a project inside of a Nix shell.
+
+      <orderedlist numeration="arabic">
+        <listitem>
+          <para>Run <literal>rebar3-nix-bootstrap</literal> every time
+          dependencies change</para>
+        </listitem>
+        <listitem>
+          <para>Set Home to the current directory.</para>
+        </listitem>
+      </orderedlist>
+
+      If you do these two things then Rebar will be happy with you. I
+      codify these into a makefile. Forunately, rebar3-nix-bootstrap
+      is idempotent and fairly quick. so you can run it as often as
+      you like.
+    </para>
+    <programlisting>
+# =============================================================================
+# Rules
+# =============================================================================
+.PHONY= all test clean repl shell build test analyze bootstrap
+
+all: test
+
+clean:
+        rm -rf _build
+        rm -rf .cache
+
+repl:
+        nix-shell --run "erl"
+
+shell:
+        nix-shell --run "bash"
+
+bootstrap:
+        nix-shell --pure --run "rebar3-nix-bootstrap"
+
+build: bootstrap
+        nix-shell --pure --run "HOME=$(CURDIR) rebar3 compile"
+
+analyze: bootstrap
+        nix-shell --pure --run "HOME=$(CURDIR) rebar3 do compile,dialyzer"
+
+test: bootstrap
+        nix-shell --pure --run "HOME=$(CURDIR) rebar3 do compile,dialyzer,eunit"
+
+    </programlisting>
+    <para>
+      If you add the <literal>shell.nix</literal> as described and
+      user rebar as follows things should simply work.
+    </para>
+  </section>
+</section>
+</section>
+<section xml:id="generating-packages-from-hex-with-hex2nix">
+  <title>Generating Packages from Hex with Hex2Nix</title>
+  <para>
+    Updating the Hex packages requires the use of the
+    <literal>hex2nix</literal> tool. Given the path to the Erlang
+    modules (usually
+    <literal>pkgs/development/erlang-modules</literal>). It will
+    happily dump a file called
+    <literal>hex-packages.nix</literal>. That file will contain all
+    the packages that use a recognized build system in Hex. However,
+    it can't know whether or not all those packages are buildable.
+    </para>
+    <para>
+      To make life easier for our users, it makes good sense to go
+      ahead and attempt to build all those packages and remove the
+      ones that don't build. To do that, simply run the command (in
+      the root of your <literal>nixpkgs</literal> repository). that follows.
+    </para>
+    <programlisting>
+$ nix-build -A erlangPackages
+    </programlisting>
+    <para>
+      That will build every package in
+      <literal>erlangPackages</literal>. Then you can go through and
+      manually remove the ones that fail. Hopefully, someone will
+      improve <literal>hex2nix</literal> in the future to automate
+      that.
+    </para>
+</section>
+</chapter>
--- a/doc/functions.xml
+++ b/doc/functions.xml
@@ -1,18 +1,629 @@
 <chapter xmlns="http://docbook.org/ns/docbook"
 	 xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
 	 xml:id="chap-functions">
- <title>Functions reference</title>
+
+<title>Functions reference</title>
+
+<para>
+  The nixpkgs repository has several utility functions to manipulate Nix expressions.
+</para>
+
+<section xml:id="sec-pkgs-overridePackages">
+  <title>pkgs.overridePackages</title>
+
+  <para>
+    This function inside the nixpkgs expression (<varname>pkgs</varname>)
+    can be used to override the set of packages itself.
+  </para>
+  <para>
+    Warning: this function is expensive and must not be used from within
+    the nixpkgs repository.
+  </para>
+  <para>
+    Example usage:
+
+    <programlisting>let
+  pkgs = import &lt;nixpkgs&gt; {};
+  newpkgs = pkgs.overridePackages (self: super: {
+    foo = super.foo.override { ... };
+  };
+in ...</programlisting>
+  </para>
+
+  <para>
+    The resulting <varname>newpkgs</varname> will have the new <varname>foo</varname>
+    expression, and all other expressions depending on <varname>foo</varname> will also
+    use the new <varname>foo</varname> expression.
+  </para>
+
+  <para>
+    The behavior of this function is similar to <link 
+    linkend="sec-modify-via-packageOverrides">config.packageOverrides</link>.
+  </para>
+
+  <para>
+    The <varname>self</varname> parameter refers to the final package set with the
+    applied overrides. Using this parameter may lead to infinite recursion if not
+    used consciously.
+  </para>
+
+  <para>
+    The <varname>super</varname> parameter refers to the old package set.
+    It's equivalent to <varname>pkgs</varname> in the above example.
+  </para>
+
+</section>
+
+<section xml:id="sec-pkg-override">
+  <title>&lt;pkg&gt;.override</title>
+
+  <para>
+    The function <varname>override</varname> is usually available for all the
+    derivations in the nixpkgs expression (<varname>pkgs</varname>).
+  </para>
+  <para>
+    It is used to override the arguments passed to a function.
+  </para>
+  <para>
+    Example usages:
+
+    <programlisting>pkgs.foo.override { arg1 = val1; arg2 = val2; ... }</programlisting>
+    <programlisting>pkgs.overridePackages (self: super: {
+  foo = super.foo.override { barSupport = true ; };
+})</programlisting>
+    <programlisting>mypkg = pkgs.callPackage ./mypkg.nix {
+  mydep = pkgs.mydep.override { ... };
+})</programlisting>
+  </para>
+
+  <para>
+    In the first example, <varname>pkgs.foo</varname> is the result of a function call
+    with some default arguments, usually a derivation.
+    Using <varname>pkgs.foo.override</varname> will call the same function with
+    the given new arguments.
+  </para>
+
+</section>
+
+<section xml:id="sec-pkg-overrideDerivation">
+  <title>&lt;pkg&gt;.overrideDerivation</title>
+
+  <warning>
+    <para>Do not use this function in Nixpkgs. Because it breaks
+    package abstraction and doesn’t provide error checking for
+    function arguments, it is only intended for ad-hoc customisation
+    (such as in <filename>~/.nixpkgs/config.nix</filename>).</para>
+  </warning>
+
+  <para>
+    The function <varname>overrideDerivation</varname> is usually available for all the
+    derivations in the nixpkgs expression (<varname>pkgs</varname>).
+  </para> 
+  <para>
+    It is used to create a new derivation by overriding the attributes of
+    the original derivation according to the given function.
+  </para>
+
+  <para>
+    Example usage:
+
+    <programlisting>mySed = pkgs.gnused.overrideDerivation (oldAttrs: {
+  name = "sed-4.2.2-pre";
+  src = fetchurl {
+    url = ftp://alpha.gnu.org/gnu/sed/sed-4.2.2-pre.tar.bz2;
+    sha256 = "11nq06d131y4wmf3drm0yk502d2xc6n5qy82cg88rb9nqd2lj41k";
+  };
+  patches = [];
+});</programlisting>
+  </para>
+
+  <para>
+    In the above example, the name, src and patches of the derivation
+    will be overridden, while all other attributes will be retained from the
+    original derivation.
+  </para>
+
+  <para>
+    The argument <varname>oldAttrs</varname> is used to refer to the attribute set of
+    the original derivation.
+  </para>
+
+</section>
+
+<section xml:id="sec-lib-makeOverridable">
+  <title>lib.makeOverridable</title>
+
+  <para>
+    The function <varname>lib.makeOverridable</varname> is used to make the result
+    of a function easily customizable. This utility only makes sense for functions
+    that accept an argument set and return an attribute set.
+  </para>
+
+  <para>
+    Example usage:
+
+    <programlisting>f = { a, b }: { result = a+b; }
+c = lib.makeOverridable f { a = 1; b = 2; }</programlisting>
+
+  </para>
+
+  <para>
+    The variable <varname>c</varname> is the value of the <varname>f</varname> function
+    applied with some default arguments. Hence the value of <varname>c.result</varname>
+    is <literal>3</literal>, in this example.
+  </para>
+
+  <para>
+    The variable <varname>c</varname> however also has some additional functions, like
+    <link linkend="sec-pkg-override">c.override</link> which can be used to
+    override the default arguments. In this example the value of
+    <varname>(c.override { a = 4; }).result</varname> is 6.
+  </para>
+
+</section>
+
+
+<section xml:id="sec-fhs-environments">
+  <title>buildFHSChrootEnv/buildFHSUserEnv</title>
+
+  <para>
+    <function>buildFHSChrootEnv</function> and
+    <function>buildFHSUserEnv</function> provide a way to build and run
+    FHS-compatible lightweight sandboxes. They get their own isolated root with
+    binded <filename>/nix/store</filename>, so their footprint in terms of disk
+    space needed is quite small. This allows one to run software which is hard or
+    unfeasible to patch for NixOS -- 3rd-party source trees with FHS assumptions,
+    games distributed as tarballs, software with integrity checking and/or external
+    self-updated binaries.
+  </para>
+
+  <para>
+    <function>buildFHSChrootEnv</function> allows to create persistent
+    environments, which can be constructed, deconstructed and entered by
+    multiple users at once. A downside is that it requires
+    <literal>root</literal> access for both those who create and destroy and
+    those who enter it. It can be useful to create environments for daemons that
+    one can enter and observe.
+  </para>
+
+  <para>
+    <function>buildFHSUserEnv</function> uses Linux namespaces feature to create
+    temporary lightweight environments which are destroyed after all child
+    processes exit. It does not require root access, and can be useful to create
+    sandboxes and wrap applications.
+  </para>
+
+  <para>
+    Those functions both rely on <function>buildFHSEnv</function>, which creates
+    an actual directory structure given a list of necessary packages and extra
+    build commands.
+    <function>buildFHSChrootEnv</function> and <function>buildFHSUserEnv</function>
+    both accept those arguments which are passed to
+    <function>buildFHSEnv</function>:
+  </para>
+
+  <variablelist>
+    <varlistentry>
+    <term><literal>name</literal></term>
+
+    <listitem><para>Environment name.</para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+    <term><literal>targetPkgs</literal></term>
+
+    <listitem><para>Packages to be installed for the main host's architecture
+    (i.e. x86_64 on x86_64 installations).</para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+    <term><literal>multiPkgs</literal></term>
+
+    <listitem><para>Packages to be installed for all architectures supported by
+    a host (i.e. i686 and x86_64 on x86_64 installations).</para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+    <term><literal>extraBuildCommands</literal></term>
+
+    <listitem><para>Additional commands to be executed for finalizing the
+    directory structure.</para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+    <term><literal>extraBuildCommandsMulti</literal></term>
+
+    <listitem><para>Like <literal>extraBuildCommandsMulti</literal>, but
+    executed only on multilib architectures.</para></listitem>
+    </varlistentry>
+  </variablelist>
+
+  <para>
+    Additionally, <function>buildFHSUserEnv</function> accepts
+    <literal>runScript</literal> parameter, which is a command that would be
+    executed inside the sandbox and passed all the command line arguments. It
+    default to <literal>bash</literal>.
+  </para>
+  <para>
+    It also uses <literal>CHROOTENV_EXTRA_BINDS</literal> environment variable
+    for binding extra directories in the sandbox to outside places. The format of
+    the variable is <literal>/mnt=test-mnt:/data</literal>, where
+    <literal>/mnt</literal> would be mounted as <literal>/test-mnt</literal>
+    and <literal>/data</literal> would be mounted as <literal>/data</literal>.
+    <literal>extraBindMounts</literal> array argument to
+    <function>buildFHSUserEnv</function> function is prepended to this variable.
+    Latter entries take priority if defined several times -- i.e. in case of
+    <literal>/data=data1:/data=data2</literal> the actual bind path would be
+    <literal>/data2</literal>.
+  </para>
+  <para>
+    One can create a simple environment using a <literal>shell.nix</literal>
+    like that:
+  </para>
+
+<programlisting><![CDATA[
+{ pkgs ? import <nixpkgs> {} }:
+
+(pkgs.buildFHSUserEnv {
+  name = "simple-x11-env";
+  targetPkgs = pkgs: (with pkgs;
+    [ udev
+      alsaLib
+    ]) ++ (with pkgs.xorg;
+    [ libX11
+      libXcursor
+      libXrandr
+    ]);
+  multiPkgs = pkgs: (with pkgs;
+    [ udev
+      alsaLib
+    ]);
+  runScript = "bash";
+}).env
+]]></programlisting>
+
+  <para>
+    Running <literal>nix-shell</literal> would then drop you into a shell with
+    these libraries and binaries available. You can use this to run
+    closed-source applications which expect FHS structure without hassles:
+    simply change <literal>runScript</literal> to the application path,
+    e.g. <filename>./bin/start.sh</filename> -- relative paths are supported.
+  </para>
+</section>
+
+<section xml:id="sec-pkgs-dockerTools">
+ <title>pkgs.dockerTools</title>
+
 <para>
-  The nixpkgs repository has several utility functions to manipulate Nix
-  expressions.
+  <varname>pkgs.dockerTools</varname> is a set of functions for creating and
+  manipulating Docker images according to the
+  <link xlink:href="https://github.com/docker/docker/blob/master/image/spec/v1.md#docker-image-specification-v100">
+   Docker Image Specification v1.0.0
+  </link>. Docker itself is not used to perform any of the operations done by these
+  functions.
 </para>

- <xi:include href="functions/library.xml" />
- <xi:include href="functions/overrides.xml" />
- <xi:include href="functions/generators.xml" />
- <xi:include href="functions/debug.xml" />
- <xi:include href="functions/fhs-environments.xml" />
- <xi:include href="functions/shell.xml" />
- <xi:include href="functions/dockertools.xml" />
+ <warning>
+  <para>
+   The <varname>dockerTools</varname> API is unstable and may be subject to
+   backwards-incompatible changes in the future.
+  </para>
+ </warning>
+
+ <section xml:id="ssec-pkgs-dockerTools-buildImage">
+  <title>buildImage</title>
+
+  <para>
+   This function is analogous to the <command>docker build</command> command,
+   in that can used to build a Docker-compatible repository tarball containing
+   a single image with one or multiple layers. As such, the result
+   is suitable for being loaded in Docker with <command>docker load</command>.
+  </para>
+
+  <para>
+   The parameters of <varname>buildImage</varname> with relative example values are
+   described below:
+  </para>
+
+  <example xml:id='ex-dockerTools-buildImage'><title>Docker build</title>
+  <programlisting>
+  buildImage {
+    name = "redis"; <co xml:id='ex-dockerTools-buildImage-1' />
+    tag = "latest"; <co xml:id='ex-dockerTools-buildImage-2' />
+    
+    fromImage = someBaseImage; <co xml:id='ex-dockerTools-buildImage-3' />
+    fromImageName = null; <co xml:id='ex-dockerTools-buildImage-4' />
+    fromImageTag = "latest"; <co xml:id='ex-dockerTools-buildImage-5' />
+    
+    contents = pkgs.redis; <co xml:id='ex-dockerTools-buildImage-6' />
+    runAsRoot = '' <co xml:id='ex-dockerTools-buildImage-runAsRoot' />
+      #!${stdenv.shell}
+      mkdir -p /data
+    '';
+
+    config = { <co xml:id='ex-dockerTools-buildImage-8' />
+      Cmd = [ "/bin/redis-server" ];
+      WorkingDir = "/data";
+      Volumes = {
+        "/data" = {};
+      };
+    };
+  }
+  </programlisting>
+  </example>
+
+  <para>The above example will build a Docker image <literal>redis/latest</literal>
+   from the given base image. Loading and running this image in Docker results in
+   <literal>redis-server</literal> being started automatically.
+  </para>
+
+  <calloutlist>
+   <callout arearefs='ex-dockerTools-buildImage-1'>
+    <para>
+     <varname>name</varname> specifies the name of the resulting image.
+     This is the only required argument for <varname>buildImage</varname>.
+    </para>
+   </callout>
+
+   <callout arearefs='ex-dockerTools-buildImage-2'>
+    <para>
+     <varname>tag</varname> specifies the tag of the resulting image.
+     By default it's <literal>latest</literal>.
+    </para>
+   </callout>
+
+   <callout arearefs='ex-dockerTools-buildImage-3'>
+    <para>
+     <varname>fromImage</varname> is the repository tarball containing the base image.
+     It must be a valid Docker image, such as exported by <command>docker save</command>.
+     By default it's <literal>null</literal>, which can be seen as equivalent
+     to <literal>FROM scratch</literal> of a <filename>Dockerfile</filename>.
+    </para>
+   </callout>
+   
+   <callout arearefs='ex-dockerTools-buildImage-4'>
+    <para>
+     <varname>fromImageName</varname> can be used to further specify
+     the base image within the repository, in case it contains multiple images.
+     By default it's <literal>null</literal>, in which case
+     <varname>buildImage</varname> will peek the first image available
+     in the repository.
+    </para>
+   </callout>
+
+   <callout arearefs='ex-dockerTools-buildImage-5'>
+    <para>
+     <varname>fromImageTag</varname> can be used to further specify the tag
+     of the base image within the repository, in case an image contains multiple tags.
+     By default it's <literal>null</literal>, in which case
+     <varname>buildImage</varname> will peek the first tag available for the base image.
+    </para>
+   </callout>
+
+   <callout arearefs='ex-dockerTools-buildImage-6'>
+    <para>
+     <varname>contents</varname> is a derivation that will be copied in the new
+     layer of the resulting image. This can be similarly seen as
+     <command>ADD contents/ /</command> in a <filename>Dockerfile</filename>.
+     By default it's <literal>null</literal>.
+    </para>
+   </callout>
+
+   <callout arearefs='ex-dockerTools-buildImage-runAsRoot'>
+    <para>
+     <varname>runAsRoot</varname> is a bash script that will run as root
+     in an environment that overlays the existing layers of the base image with
+     the new resulting layer, including the previously copied
+     <varname>contents</varname> derivation.
+     This can be similarly seen as
+     <command>RUN ...</command> in a <filename>Dockerfile</filename>.
+     
+     <note>
+      <para>
+       Using this parameter requires the <literal>kvm</literal>
+       device to be available.
+      </para>
+     </note>
+    </para>
+   </callout>
+
+   <callout arearefs='ex-dockerTools-buildImage-8'>
+    <para>
+     <varname>config</varname> is used to specify the configuration of the
+     containers that will be started off the built image in Docker.
+     The available options are listed in the
+     <link xlink:href="https://github.com/docker/docker/blob/master/image/spec/v1.md#container-runconfig-field-descriptions">
+      Docker Image Specification v1.0.0
+     </link>.
+    </para>
+   </callout>
+
+  </calloutlist>
+
+  <para>
+   After the new layer has been created, its closure
+   (to which <varname>contents</varname>, <varname>config</varname> and
+   <varname>runAsRoot</varname> contribute) will be copied in the layer itself.
+   Only new dependencies that are not already in the existing layers will be copied.
+  </para>
+
+  <para>
+   At the end of the process, only one new single layer will be produced and
+   added to the resulting image.
+  </para>
+
+  <para>
+   The resulting repository will only list the single image
+   <varname>image/tag</varname>. In the case of <xref linkend='ex-dockerTools-buildImage'/>
+   it would be <varname>redis/latest</varname>.
+  </para>
+
+  <para>
+   It is possible to inspect the arguments with which an image was built
+   using its <varname>buildArgs</varname> attribute.
+  </para>
+
+ </section>
+
+ <section xml:id="ssec-pkgs-dockerTools-fetchFromRegistry">
+  <title>pullImage</title>
+
+  <para>
+   This function is analogous to the <command>docker pull</command> command,
+   in that can be used to fetch a Docker image from a Docker registry.
+   Currently only registry <literal>v1</literal> is supported.
+   By default <link xlink:href="https://hub.docker.com/">Docker Hub</link>
+   is used to pull images.
+  </para>
+
+  <para>
+   Its parameters are described in the example below:
+  </para>
+
+  <example xml:id='ex-dockerTools-pullImage'><title>Docker pull</title>
+  <programlisting>
+  pullImage {
+    imageName = "debian"; <co xml:id='ex-dockerTools-pullImage-1' />
+    imageTag = "jessie"; <co xml:id='ex-dockerTools-pullImage-2' />
+    imageId = null; <co xml:id='ex-dockerTools-pullImage-3' />
+    sha256 = "1bhw5hkz6chrnrih0ymjbmn69hyfriza2lr550xyvpdrnbzr4gk2"; <co xml:id='ex-dockerTools-pullImage-4' />
+
+    indexUrl = "https://index.docker.io"; <co xml:id='ex-dockerTools-pullImage-5' />
+    registryVersion = "v1";
+  }
+  </programlisting>
+  </example>
+
+  <calloutlist>
+   <callout arearefs='ex-dockerTools-pullImage-1'>
+    <para>
+     <varname>imageName</varname> specifies the name of the image to be downloaded,
+     which can also include the registry namespace (e.g. <literal>library/debian</literal>).
+     This argument is required.
+    </para>
+   </callout>
+   
+   <callout arearefs='ex-dockerTools-pullImage-2'>
+    <para>
+     <varname>imageTag</varname> specifies the tag of the image to be downloaded.
+     By default it's <literal>latest</literal>.
+    </para>
+   </callout>
+
+   <callout arearefs='ex-dockerTools-pullImage-3'>
+    <para>
+     <varname>imageId</varname>, if specified this exact image will be fetched, instead
+     of <varname>imageName/imageTag</varname>. However, the resulting repository
+     will still be named <varname>imageName/imageTag</varname>.
+     By default it's <literal>null</literal>.
+    </para>
+   </callout>
+
+   <callout arearefs='ex-dockerTools-pullImage-4'>
+    <para>
+     <varname>sha256</varname> is the checksum of the whole fetched image.
+     This argument is required.
+    </para>
+
+    <note>
+     <para>The checksum is computed on the unpacked directory, not on the final tarball.</para>
+    </note>
+
+   </callout>
+
+   <callout arearefs='ex-dockerTools-pullImage-5'>
+    <para>
+     In the above example the default values are shown for the variables
+     <varname>indexUrl</varname> and <varname>registryVersion</varname>.
+     Hence by default the Docker.io registry is used to pull the images.
+    </para>
+   </callout>
+  </calloutlist>
+   
+ </section>
+  
+ <section xml:id="ssec-pkgs-dockerTools-exportImage">
+  <title>exportImage</title>
+
+  <para>
+   This function is analogous to the <command>docker export</command> command,
+   in that can used to flatten a Docker image that contains multiple layers.
+   It is in fact the result of the merge of all the layers of the image.
+   As such, the result is suitable for being imported in Docker
+   with <command>docker import</command>.
+  </para>
+
+  <note>
+   <para>
+    Using this function requires the <literal>kvm</literal>
+    device to be available.
+   </para>
+  </note>
+
+  <para>
+   The parameters of <varname>exportImage</varname> are the following:
+  </para>
+
+  <example xml:id='ex-dockerTools-exportImage'><title>Docker export</title>
+  <programlisting>
+  exportImage {
+    fromImage = someLayeredImage;
+    fromImageName = null;
+    fromImageTag = null;
+    
+    name = someLayeredImage.name;
+  }
+  </programlisting>
+  </example>
+
+  <para>
+   The parameters relative to the base image have the same synopsis as
+   described in <xref linkend='ssec-pkgs-dockerTools-buildImage'/>, except that
+   <varname>fromImage</varname> is the only required argument in this case.
+  </para>
+
+  <para>
+   The <varname>name</varname> argument is the name of the derivation output,
+   which defaults to <varname>fromImage.name</varname>.
+  </para>
+ </section>
+
+ <section xml:id="ssec-pkgs-dockerTools-shadowSetup">
+  <title>shadowSetup</title>
+
+  <para>
+   This constant string is a helper for setting up the base files for managing
+   users and groups, only if such files don't exist already.
+   It is suitable for being used in a
+   <varname>runAsRoot</varname> <xref linkend='ex-dockerTools-buildImage-runAsRoot'/> script for cases like
+   in the example below:
+  </para>
+  
+  <example xml:id='ex-dockerTools-shadowSetup'><title>Shadow base files</title>
+  <programlisting>
+  buildImage {
+    name = "shadow-basic";
+
+    runAsRoot = ''
+      #!${stdenv.shell}
+      ${shadowSetup}
+      groupadd -r redis
+      useradd -r -g redis redis
+      mkdir /data
+      chown redis:redis /data
+    '';
+  }
+  </programlisting>
+  </example>
+
+  <para>
+   Creating base files like <literal>/etc/passwd</literal> or
+   <literal>/etc/login.defs</literal> are necessary for shadow-utils to
+   manipulate users and groups.
+  </para>
+  
+ </section>
+ 
+</section>
+
 </chapter>
--- a/doc/functions/debug.xml
+++ b/doc/functions/debug.xml
@@ -1,21 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-debug">
- <title>Debugging Nix Expressions</title>
-
- <para>
-  Nix is a unityped, dynamic language, this means every value can potentially
-  appear anywhere. Since it is also non-strict, evaluation order and what
-  ultimately is evaluated might surprise you. Therefore it is important to be
-  able to debug nix expressions.
- </para>
-
- <para>
-  In the <literal>lib/debug.nix</literal> file you will find a number of
-  functions that help (pretty-)printing values while evaluation is runnnig. You
-  can even specify how deep these values should be printed recursively, and
-  transform them on the fly. Please consult the docstrings in
-  <literal>lib/debug.nix</literal> for usage information.
- </para>
-</section>
--- a/doc/functions/dockertools.xml
+++ b/doc/functions/dockertools.xml
@@ -1,564 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-pkgs-dockerTools">
- <title>pkgs.dockerTools</title>
-
- <para>
-  <varname>pkgs.dockerTools</varname> is a set of functions for creating and
-  manipulating Docker images according to the
-  <link xlink:href="https://github.com/moby/moby/blob/master/image/spec/v1.2.md#docker-image-specification-v120">
-  Docker Image Specification v1.2.0 </link>. Docker itself is not used to
-  perform any of the operations done by these functions.
- </para>
-
- <warning>
-  <para>
-   The <varname>dockerTools</varname> API is unstable and may be subject to
-   backwards-incompatible changes in the future.
-  </para>
- </warning>
-
- <section xml:id="ssec-pkgs-dockerTools-buildImage">
-  <title>buildImage</title>
-
-  <para>
-   This function is analogous to the <command>docker build</command> command,
-   in that can used to build a Docker-compatible repository tarball containing
-   a single image with one or multiple layers. As such, the result is suitable
-   for being loaded in Docker with <command>docker load</command>.
-  </para>
-
-  <para>
-   The parameters of <varname>buildImage</varname> with relative example values
-   are described below:
-  </para>
-
-  <example xml:id='ex-dockerTools-buildImage'>
-   <title>Docker build</title>
-<programlisting>
-buildImage {
-  name = "redis"; <co xml:id='ex-dockerTools-buildImage-1' />
-  tag = "latest"; <co xml:id='ex-dockerTools-buildImage-2' />
-
-  fromImage = someBaseImage; <co xml:id='ex-dockerTools-buildImage-3' />
-  fromImageName = null; <co xml:id='ex-dockerTools-buildImage-4' />
-  fromImageTag = "latest"; <co xml:id='ex-dockerTools-buildImage-5' />
-
-  contents = pkgs.redis; <co xml:id='ex-dockerTools-buildImage-6' />
-  runAsRoot = '' <co xml:id='ex-dockerTools-buildImage-runAsRoot' />
-    #!${stdenv.shell}
-    mkdir -p /data
-  '';
-
-  config = { <co xml:id='ex-dockerTools-buildImage-8' />
-    Cmd = [ "/bin/redis-server" ];
-    WorkingDir = "/data";
-    Volumes = {
-      "/data" = {};
-    };
-  };
-}
-</programlisting>
-  </example>
-
-  <para>
-   The above example will build a Docker image <literal>redis/latest</literal>
-   from the given base image. Loading and running this image in Docker results
-   in <literal>redis-server</literal> being started automatically.
-  </para>
-
-  <calloutlist>
-   <callout arearefs='ex-dockerTools-buildImage-1'>
-    <para>
-     <varname>name</varname> specifies the name of the resulting image. This is
-     the only required argument for <varname>buildImage</varname>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-2'>
-    <para>
-     <varname>tag</varname> specifies the tag of the resulting image. By
-     default it's <literal>null</literal>, which indicates that the nix output
-     hash will be used as tag.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-3'>
-    <para>
-     <varname>fromImage</varname> is the repository tarball containing the base
-     image. It must be a valid Docker image, such as exported by
-     <command>docker save</command>. By default it's <literal>null</literal>,
-     which can be seen as equivalent to <literal>FROM scratch</literal> of a
-     <filename>Dockerfile</filename>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-4'>
-    <para>
-     <varname>fromImageName</varname> can be used to further specify the base
-     image within the repository, in case it contains multiple images. By
-     default it's <literal>null</literal>, in which case
-     <varname>buildImage</varname> will peek the first image available in the
-     repository.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-5'>
-    <para>
-     <varname>fromImageTag</varname> can be used to further specify the tag of
-     the base image within the repository, in case an image contains multiple
-     tags. By default it's <literal>null</literal>, in which case
-     <varname>buildImage</varname> will peek the first tag available for the
-     base image.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-6'>
-    <para>
-     <varname>contents</varname> is a derivation that will be copied in the new
-     layer of the resulting image. This can be similarly seen as <command>ADD
-     contents/ /</command> in a <filename>Dockerfile</filename>. By default
-     it's <literal>null</literal>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-runAsRoot'>
-    <para>
-     <varname>runAsRoot</varname> is a bash script that will run as root in an
-     environment that overlays the existing layers of the base image with the
-     new resulting layer, including the previously copied
-     <varname>contents</varname> derivation. This can be similarly seen as
-     <command>RUN ...</command> in a <filename>Dockerfile</filename>.
-     <note>
-      <para>
-       Using this parameter requires the <literal>kvm</literal> device to be
-       available.
-      </para>
-     </note>
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-8'>
-    <para>
-     <varname>config</varname> is used to specify the configuration of the
-     containers that will be started off the built image in Docker. The
-     available options are listed in the
-     <link xlink:href="https://github.com/moby/moby/blob/master/image/spec/v1.2.md#image-json-field-descriptions">
-     Docker Image Specification v1.2.0 </link>.
-    </para>
-   </callout>
-  </calloutlist>
-
-  <para>
-   After the new layer has been created, its closure (to which
-   <varname>contents</varname>, <varname>config</varname> and
-   <varname>runAsRoot</varname> contribute) will be copied in the layer itself.
-   Only new dependencies that are not already in the existing layers will be
-   copied.
-  </para>
-
-  <para>
-   At the end of the process, only one new single layer will be produced and
-   added to the resulting image.
-  </para>
-
-  <para>
-   The resulting repository will only list the single image
-   <varname>image/tag</varname>. In the case of
-   <xref linkend='ex-dockerTools-buildImage'/> it would be
-   <varname>redis/latest</varname>.
-  </para>
-
-  <para>
-   It is possible to inspect the arguments with which an image was built using
-   its <varname>buildArgs</varname> attribute.
-  </para>
-
-  <note>
-   <para>
-    If you see errors similar to <literal>getProtocolByName: does not exist (no
-    such protocol name: tcp)</literal> you may need to add
-    <literal>pkgs.iana-etc</literal> to <varname>contents</varname>.
-   </para>
-  </note>
-
-  <note>
-   <para>
-    If you see errors similar to <literal>Error_Protocol ("certificate has
-    unknown CA",True,UnknownCa)</literal> you may need to add
-    <literal>pkgs.cacert</literal> to <varname>contents</varname>.
-   </para>
-  </note>
-
-  <example xml:id="example-pkgs-dockerTools-buildImage-creation-date">
-   <title>Impurely Defining a Docker Layer's Creation Date</title>
-   <para>
-    By default <function>buildImage</function> will use a static date of one
-    second past the UNIX Epoch. This allows <function>buildImage</function> to
-    produce binary reproducible images. When listing images with
-    <command>docker list images</command>, the newly created images will be
-    listed like this:
-   </para>
-<screen><![CDATA[
-$ docker image list
-REPOSITORY   TAG      IMAGE ID       CREATED        SIZE
-hello        latest   08c791c7846e   48 years ago   25.2MB
-]]></screen>
-   <para>
-    You can break binary reproducibility but have a sorted, meaningful
-    <literal>CREATED</literal> column by setting <literal>created</literal> to
-    <literal>now</literal>.
-   </para>
-<programlisting><![CDATA[
-pkgs.dockerTools.buildImage {
-  name = "hello";
-  tag = "latest";
-  created = "now";
-  contents = pkgs.hello;
-
-  config.Cmd = [ "/bin/hello" ];
-}
-]]></programlisting>
-   <para>
-    and now the Docker CLI will display a reasonable date and sort the images
-    as expected:
-<screen><![CDATA[
-$ docker image list
-REPOSITORY   TAG      IMAGE ID       CREATED              SIZE
-hello        latest   de2bf4786de6   About a minute ago   25.2MB
-]]></screen>
-    however, the produced images will not be binary reproducible.
-   </para>
-  </example>
- </section>
-
- <section xml:id="ssec-pkgs-dockerTools-buildLayeredImage">
-  <title>buildLayeredImage</title>
-
-  <para>
-   Create a Docker image with many of the store paths being on their own layer
-   to improve sharing between images.
-  </para>
-
-  <variablelist>
-   <varlistentry>
-    <term>
-     <varname>name</varname>
-    </term>
-    <listitem>
-     <para>
-      The name of the resulting image.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>tag</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Tag of the generated image.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> the output path's hash
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>contents</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Top level paths in the container. Either a single derivation, or a list
-      of derivations.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> <literal>[]</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>config</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Run-time configuration of the container. A full list of the options are
-      available at in the
-      <link xlink:href="https://github.com/moby/moby/blob/master/image/spec/v1.2.md#image-json-field-descriptions">
-      Docker Image Specification v1.2.0 </link>.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> <literal>{}</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>created</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Date and time the layers were created. Follows the same
-      <literal>now</literal> exception supported by
-      <literal>buildImage</literal>.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> <literal>1970-01-01T00:00:01Z</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>maxLayers</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Maximum number of layers to create.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> <literal>24</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
-
-  <section xml:id="dockerTools-buildLayeredImage-arg-contents">
-   <title>Behavior of <varname>contents</varname> in the final image</title>
-
-   <para>
-    Each path directly listed in <varname>contents</varname> will have a
-    symlink in the root of the image.
-   </para>
-
-   <para>
-    For example:
-<programlisting><![CDATA[
-pkgs.dockerTools.buildLayeredImage {
-  name = "hello";
-  contents = [ pkgs.hello ];
-}
-]]></programlisting>
-    will create symlinks for all the paths in the <literal>hello</literal>
-    package:
-<screen><![CDATA[
-/bin/hello -> /nix/store/h1zb1padqbbb7jicsvkmrym3r6snphxg-hello-2.10/bin/hello
-/share/info/hello.info -> /nix/store/h1zb1padqbbb7jicsvkmrym3r6snphxg-hello-2.10/share/info/hello.info
-/share/locale/bg/LC_MESSAGES/hello.mo -> /nix/store/h1zb1padqbbb7jicsvkmrym3r6snphxg-hello-2.10/share/locale/bg/LC_MESSAGES/hello.mo
-]]></screen>
-   </para>
-  </section>
-
-  <section xml:id="dockerTools-buildLayeredImage-arg-config">
-   <title>Automatic inclusion of <varname>config</varname> references</title>
-
-   <para>
-    The closure of <varname>config</varname> is automatically included in the
-    closure of the final image.
-   </para>
-
-   <para>
-    This allows you to make very simple Docker images with very little code.
-    This container will start up and run <command>hello</command>:
-<programlisting><![CDATA[
-pkgs.dockerTools.buildLayeredImage {
-  name = "hello";
-  config.Cmd = [ "${pkgs.hello}/bin/hello" ];
-}
-]]></programlisting>
-   </para>
-  </section>
-
-  <section xml:id="dockerTools-buildLayeredImage-arg-maxLayers">
-   <title>Adjusting <varname>maxLayers</varname></title>
-
-   <para>
-    Increasing the <varname>maxLayers</varname> increases the number of layers
-    which have a chance to be shared between different images.
-   </para>
-
-   <para>
-    Modern Docker installations support up to 128 layers, however older
-    versions support as few as 42.
-   </para>
-
-   <para>
-    If the produced image will not be extended by other Docker builds, it is
-    safe to set <varname>maxLayers</varname> to <literal>128</literal>. However
-    it will be impossible to extend the image further.
-   </para>
-
-   <para>
-    The first (<literal>maxLayers-2</literal>) most "popular" paths will have
-    their own individual layers, then layer #<literal>maxLayers-1</literal>
-    will contain all the remaining "unpopular" paths, and finally layer
-    #<literal>maxLayers</literal> will contain the Image configuration.
-   </para>
-
-   <para>
-    Docker's Layers are not inherently ordered, they are content-addressable
-    and are not explicitly layered until they are composed in to an Image.
-   </para>
-  </section>
- </section>
-
- <section xml:id="ssec-pkgs-dockerTools-fetchFromRegistry">
-  <title>pullImage</title>
-
-  <para>
-   This function is analogous to the <command>docker pull</command> command, in
-   that can be used to pull a Docker image from a Docker registry. By default
-   <link xlink:href="https://hub.docker.com/">Docker Hub</link> is used to pull
-   images.
-  </para>
-
-  <para>
-   Its parameters are described in the example below:
-  </para>
-
-  <example xml:id='ex-dockerTools-pullImage'>
-   <title>Docker pull</title>
-<programlisting>
-pullImage {
-  imageName = "nixos/nix"; <co xml:id='ex-dockerTools-pullImage-1' />
-  imageDigest = "sha256:20d9485b25ecfd89204e843a962c1bd70e9cc6858d65d7f5fadc340246e2116b"; <co xml:id='ex-dockerTools-pullImage-2' />
-  finalImageTag = "1.11";  <co xml:id='ex-dockerTools-pullImage-3' />
-  sha256 = "0mqjy3zq2v6rrhizgb9nvhczl87lcfphq9601wcprdika2jz7qh8"; <co xml:id='ex-dockerTools-pullImage-4' />
-  os = "linux"; <co xml:id='ex-dockerTools-pullImage-5' />
-  arch = "x86_64"; <co xml:id='ex-dockerTools-pullImage-6' />
-}
-</programlisting>
-  </example>
-
-  <calloutlist>
-   <callout arearefs='ex-dockerTools-pullImage-1'>
-    <para>
-     <varname>imageName</varname> specifies the name of the image to be
-     downloaded, which can also include the registry namespace (e.g.
-     <literal>nixos</literal>). This argument is required.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-2'>
-    <para>
-     <varname>imageDigest</varname> specifies the digest of the image to be
-     downloaded. Skopeo can be used to get the digest of an image, with its
-     <varname>inspect</varname> subcommand. Since a given
-     <varname>imageName</varname> may transparently refer to a manifest list of
-     images which support multiple architectures and/or operating systems,
-     supply the `--override-os` and `--override-arch` arguments to specify
-     exactly which image you want. By default it will match the OS and
-     architecture of the host the command is run on.
-<programlisting>
-$ nix-shell --packages skopeo jq --command "skopeo --override-os linux --override-arch x86_64 inspect docker://docker.io/nixos/nix:1.11 | jq -r '.Digest'"
-sha256:20d9485b25ecfd89204e843a962c1bd70e9cc6858d65d7f5fadc340246e2116b
-</programlisting>
-     This argument is required.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-3'>
-    <para>
-     <varname>finalImageTag</varname>, if specified, this is the tag of the
-     image to be created. Note it is never used to fetch the image since we
-     prefer to rely on the immutable digest ID. By default it's
-     <literal>latest</literal>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-4'>
-    <para>
-     <varname>sha256</varname> is the checksum of the whole fetched image. This
-     argument is required.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-5'>
-    <para>
-     <varname>os</varname>, if specified, is the operating system of the
-     fetched image. By default it's <literal>linux</literal>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-6'>
-    <para>
-     <varname>arch</varname>, if specified, is the cpu architecture of the
-     fetched image. By default it's <literal>x86_64</literal>.
-    </para>
-   </callout>
-  </calloutlist>
- </section>
-
- <section xml:id="ssec-pkgs-dockerTools-exportImage">
-  <title>exportImage</title>
-
-  <para>
-   This function is analogous to the <command>docker export</command> command,
-   in that can used to flatten a Docker image that contains multiple layers. It
-   is in fact the result of the merge of all the layers of the image. As such,
-   the result is suitable for being imported in Docker with <command>docker
-   import</command>.
-  </para>
-
-  <note>
-   <para>
-    Using this function requires the <literal>kvm</literal> device to be
-    available.
-   </para>
-  </note>
-
-  <para>
-   The parameters of <varname>exportImage</varname> are the following:
-  </para>
-
-  <example xml:id='ex-dockerTools-exportImage'>
-   <title>Docker export</title>
-<programlisting>
-exportImage {
-  fromImage = someLayeredImage;
-  fromImageName = null;
-  fromImageTag = null;
-
-  name = someLayeredImage.name;
-}
-  </programlisting>
-  </example>
-
-  <para>
-   The parameters relative to the base image have the same synopsis as
-   described in <xref linkend='ssec-pkgs-dockerTools-buildImage'/>, except that
-   <varname>fromImage</varname> is the only required argument in this case.
-  </para>
-
-  <para>
-   The <varname>name</varname> argument is the name of the derivation output,
-   which defaults to <varname>fromImage.name</varname>.
-  </para>
- </section>
-
- <section xml:id="ssec-pkgs-dockerTools-shadowSetup">
-  <title>shadowSetup</title>
-
-  <para>
-   This constant string is a helper for setting up the base files for managing
-   users and groups, only if such files don't exist already. It is suitable for
-   being used in a <varname>runAsRoot</varname>
-   <xref linkend='ex-dockerTools-buildImage-runAsRoot'/> script for cases like
-   in the example below:
-  </para>
-
-  <example xml:id='ex-dockerTools-shadowSetup'>
-   <title>Shadow base files</title>
-<programlisting>
-buildImage {
-  name = "shadow-basic";
-
-  runAsRoot = ''
-    #!${stdenv.shell}
-    ${shadowSetup}
-    groupadd -r redis
-    useradd -r -g redis redis
-    mkdir /data
-    chown redis:redis /data
-  '';
-}
-</programlisting>
-  </example>
-
-  <para>
-   Creating base files like <literal>/etc/passwd</literal> or
-   <literal>/etc/login.defs</literal> are necessary for shadow-utils to
-   manipulate users and groups.
-  </para>
- </section>
-</section>
--- a/doc/functions/fhs-environments.xml
+++ b/doc/functions/fhs-environments.xml
@@ -1,142 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-fhs-environments">
- <title>buildFHSUserEnv</title>
-
- <para>
-  <function>buildFHSUserEnv</function> provides a way to build and run
-  FHS-compatible lightweight sandboxes. It creates an isolated root with bound
-  <filename>/nix/store</filename>, so its footprint in terms of disk space
-  needed is quite small. This allows one to run software which is hard or
-  unfeasible to patch for NixOS -- 3rd-party source trees with FHS assumptions,
-  games distributed as tarballs, software with integrity checking and/or
-  external self-updated binaries. It uses Linux namespaces feature to create
-  temporary lightweight environments which are destroyed after all child
-  processes exit, without root user rights requirement. Accepted arguments are:
- </para>
-
- <variablelist>
-  <varlistentry>
-   <term>
-    <literal>name</literal>
-   </term>
-   <listitem>
-    <para>
-     Environment name.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>targetPkgs</literal>
-   </term>
-   <listitem>
-    <para>
-     Packages to be installed for the main host's architecture (i.e. x86_64 on
-     x86_64 installations). Along with libraries binaries are also installed.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>multiPkgs</literal>
-   </term>
-   <listitem>
-    <para>
-     Packages to be installed for all architectures supported by a host (i.e.
-     i686 and x86_64 on x86_64 installations). Only libraries are installed by
-     default.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraBuildCommands</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional commands to be executed for finalizing the directory structure.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraBuildCommandsMulti</literal>
-   </term>
-   <listitem>
-    <para>
-     Like <literal>extraBuildCommands</literal>, but executed only on multilib
-     architectures.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraOutputsToInstall</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional derivation outputs to be linked for both target and
-     multi-architecture packages.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraInstallCommands</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional commands to be executed for finalizing the derivation with
-     runner script.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>runScript</literal>
-   </term>
-   <listitem>
-    <para>
-     A command that would be executed inside the sandbox and passed all the
-     command line arguments. It defaults to <literal>bash</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
- </variablelist>
-
- <para>
-  One can create a simple environment using a <literal>shell.nix</literal> like
-  that:
- </para>
-
-<programlisting><![CDATA[
-{ pkgs ? import <nixpkgs> {} }:
-
-(pkgs.buildFHSUserEnv {
-  name = "simple-x11-env";
-  targetPkgs = pkgs: (with pkgs;
-    [ udev
-      alsaLib
-    ]) ++ (with pkgs.xorg;
-    [ libX11
-      libXcursor
-      libXrandr
-    ]);
-  multiPkgs = pkgs: (with pkgs;
-    [ udev
-      alsaLib
-    ]);
-  runScript = "bash";
-}).env
-]]></programlisting>
-
- <para>
-  Running <literal>nix-shell</literal> would then drop you into a shell with
-  these libraries and binaries available. You can use this to run closed-source
-  applications which expect FHS structure without hassles: simply change
-  <literal>runScript</literal> to the application path, e.g.
-  <filename>./bin/start.sh</filename> -- relative paths are supported.
- </para>
-</section>
--- a/doc/functions/generators.xml
+++ b/doc/functions/generators.xml
@@ -1,89 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-generators">
- <title>Generators</title>
-
- <para>
-  Generators are functions that create file formats from nix data structures,
-  e. g. for configuration files. There are generators available for:
-  <literal>INI</literal>, <literal>JSON</literal> and <literal>YAML</literal>
- </para>
-
- <para>
-  All generators follow a similar call interface: <code>generatorName
-  configFunctions data</code>, where <literal>configFunctions</literal> is an
-  attrset of user-defined functions that format nested parts of the content.
-  They each have common defaults, so often they do not need to be set manually.
-  An example is <code>mkSectionName ? (name: libStr.escape [ "[" "]" ]
-  name)</code> from the <literal>INI</literal> generator. It receives the name
-  of a section and sanitizes it. The default <literal>mkSectionName</literal>
-  escapes <literal>[</literal> and <literal>]</literal> with a backslash.
- </para>
-
- <para>
-  Generators can be fine-tuned to produce exactly the file format required by
-  your application/service. One example is an INI-file format which uses
-  <literal>: </literal> as separator, the strings
-  <literal>"yes"</literal>/<literal>"no"</literal> as boolean values and
-  requires all string values to be quoted:
- </para>
-
-<programlisting>
-with lib;
-let
-  customToINI = generators.toINI {
-    # specifies how to format a key/value pair
-    mkKeyValue = generators.mkKeyValueDefault {
-      # specifies the generated string for a subset of nix values
-      mkValueString = v:
-             if v == true then ''"yes"''
-        else if v == false then ''"no"''
-        else if isString v then ''"${v}"''
-        # and delegats all other values to the default generator
-        else generators.mkValueStringDefault {} v;
-    } ":";
-  };
-
-# the INI file can now be given as plain old nix values
-in customToINI {
-  main = {
-    pushinfo = true;
-    autopush = false;
-    host = "localhost";
-    port = 42;
-  };
-  mergetool = {
-    merge = "diff3";
-  };
-}
-</programlisting>
-
- <para>
-  This will produce the following INI file as nix string:
- </para>
-
-<programlisting>
-[main]
-autopush:"no"
-host:"localhost"
-port:42
-pushinfo:"yes"
-str\:ange:"very::strange"
-
-[mergetool]
-merge:"diff3"
-</programlisting>
-
- <note>
-  <para>
-   Nix store paths can be converted to strings by enclosing a derivation
-   attribute like so: <code>"${drv}"</code>.
-  </para>
- </note>
-
- <para>
-  Detailed documentation for each generator can be found in
-  <literal>lib/generators.nix</literal>.
- </para>
-</section>
--- a/doc/functions/library.xml
+++ b/doc/functions/library.xml
@@ -1,13 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-functions-library">
- <title>Nixpkgs Library Functions</title>
-
- <para>
-  Nixpkgs provides a standard library at <varname>pkgs.lib</varname>, or
-  through <code>import &lt;nixpkgs/lib&gt;</code>.
- </para>
-
- <xi:include href="./library/attrsets.xml" />
-</section>
--- a/doc/functions/library/attrsets.xml
+++ b/doc/functions/library/attrsets.xml
--- a/doc/functions/overrides.xml
+++ b/doc/functions/overrides.xml
@@ -1,193 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-overrides">
- <title>Overriding</title>
-
- <para>
-  Sometimes one wants to override parts of <literal>nixpkgs</literal>, e.g.
-  derivation attributes, the results of derivations or even the whole package
-  set.
- </para>
-
- <section xml:id="sec-pkg-override">
-  <title>&lt;pkg&gt;.override</title>
-
-  <para>
-   The function <varname>override</varname> is usually available for all the
-   derivations in the nixpkgs expression (<varname>pkgs</varname>).
-  </para>
-
-  <para>
-   It is used to override the arguments passed to a function.
-  </para>
-
-  <para>
-   Example usages:
-<programlisting>pkgs.foo.override { arg1 = val1; arg2 = val2; ... }</programlisting>
-<programlisting>import pkgs.path { overlays = [ (self: super: {
-    foo = super.foo.override { barSupport = true ; };
-  })]};</programlisting>
-<programlisting>mypkg = pkgs.callPackage ./mypkg.nix {
-    mydep = pkgs.mydep.override { ... };
-  }</programlisting>
-  </para>
-
-  <para>
-   In the first example, <varname>pkgs.foo</varname> is the result of a
-   function call with some default arguments, usually a derivation. Using
-   <varname>pkgs.foo.override</varname> will call the same function with the
-   given new arguments.
-  </para>
- </section>
-
- <section xml:id="sec-pkg-overrideAttrs">
-  <title>&lt;pkg&gt;.overrideAttrs</title>
-
-  <para>
-   The function <varname>overrideAttrs</varname> allows overriding the
-   attribute set passed to a <varname>stdenv.mkDerivation</varname> call,
-   producing a new derivation based on the original one. This function is
-   available on all derivations produced by the
-   <varname>stdenv.mkDerivation</varname> function, which is most packages in
-   the nixpkgs expression <varname>pkgs</varname>.
-  </para>
-
-  <para>
-   Example usage:
-<programlisting>helloWithDebug = pkgs.hello.overrideAttrs (oldAttrs: rec {
-    separateDebugInfo = true;
-  });</programlisting>
-  </para>
-
-  <para>
-   In the above example, the <varname>separateDebugInfo</varname> attribute is
-   overridden to be true, thus building debug info for
-   <varname>helloWithDebug</varname>, while all other attributes will be
-   retained from the original <varname>hello</varname> package.
-  </para>
-
-  <para>
-   The argument <varname>oldAttrs</varname> is conventionally used to refer to
-   the attr set originally passed to <varname>stdenv.mkDerivation</varname>.
-  </para>
-
-  <note>
-   <para>
-    Note that <varname>separateDebugInfo</varname> is processed only by the
-    <varname>stdenv.mkDerivation</varname> function, not the generated, raw Nix
-    derivation. Thus, using <varname>overrideDerivation</varname> will not work
-    in this case, as it overrides only the attributes of the final derivation.
-    It is for this reason that <varname>overrideAttrs</varname> should be
-    preferred in (almost) all cases to <varname>overrideDerivation</varname>,
-    i.e. to allow using <varname>sdenv.mkDerivation</varname> to process input
-    arguments, as well as the fact that it is easier to use (you can use the
-    same attribute names you see in your Nix code, instead of the ones
-    generated (e.g. <varname>buildInputs</varname> vs
-    <varname>nativeBuildInputs</varname>, and involves less typing.
-   </para>
-  </note>
- </section>
-
- <section xml:id="sec-pkg-overrideDerivation">
-  <title>&lt;pkg&gt;.overrideDerivation</title>
-
-  <warning>
-   <para>
-    You should prefer <varname>overrideAttrs</varname> in almost all cases, see
-    its documentation for the reasons why.
-    <varname>overrideDerivation</varname> is not deprecated and will continue
-    to work, but is less nice to use and does not have as many abilities as
-    <varname>overrideAttrs</varname>.
-   </para>
-  </warning>
-
-  <warning>
-   <para>
-    Do not use this function in Nixpkgs as it evaluates a Derivation before
-    modifying it, which breaks package abstraction and removes error-checking
-    of function arguments. In addition, this evaluation-per-function
-    application incurs a performance penalty, which can become a problem if
-    many overrides are used. It is only intended for ad-hoc customisation, such
-    as in <filename>~/.config/nixpkgs/config.nix</filename>.
-   </para>
-  </warning>
-
-  <para>
-   The function <varname>overrideDerivation</varname> creates a new derivation
-   based on an existing one by overriding the original's attributes with the
-   attribute set produced by the specified function. This function is available
-   on all derivations defined using the <varname>makeOverridable</varname>
-   function. Most standard derivation-producing functions, such as
-   <varname>stdenv.mkDerivation</varname>, are defined using this function,
-   which means most packages in the nixpkgs expression,
-   <varname>pkgs</varname>, have this function.
-  </para>
-
-  <para>
-   Example usage:
-<programlisting>mySed = pkgs.gnused.overrideDerivation (oldAttrs: {
-    name = "sed-4.2.2-pre";
-    src = fetchurl {
-      url = ftp://alpha.gnu.org/gnu/sed/sed-4.2.2-pre.tar.bz2;
-      sha256 = "11nq06d131y4wmf3drm0yk502d2xc6n5qy82cg88rb9nqd2lj41k";
-    };
-    patches = [];
-  });</programlisting>
-  </para>
-
-  <para>
-   In the above example, the <varname>name</varname>, <varname>src</varname>,
-   and <varname>patches</varname> of the derivation will be overridden, while
-   all other attributes will be retained from the original derivation.
-  </para>
-
-  <para>
-   The argument <varname>oldAttrs</varname> is used to refer to the attribute
-   set of the original derivation.
-  </para>
-
-  <note>
-   <para>
-    A package's attributes are evaluated *before* being modified by the
-    <varname>overrideDerivation</varname> function. For example, the
-    <varname>name</varname> attribute reference in <varname>url =
-    "mirror://gnu/hello/${name}.tar.gz";</varname> is filled-in *before* the
-    <varname>overrideDerivation</varname> function modifies the attribute set.
-    This means that overriding the <varname>name</varname> attribute, in this
-    example, *will not* change the value of the <varname>url</varname>
-    attribute. Instead, we need to override both the <varname>name</varname>
-    *and* <varname>url</varname> attributes.
-   </para>
-  </note>
- </section>
-
- <section xml:id="sec-lib-makeOverridable">
-  <title>lib.makeOverridable</title>
-
-  <para>
-   The function <varname>lib.makeOverridable</varname> is used to make the
-   result of a function easily customizable. This utility only makes sense for
-   functions that accept an argument set and return an attribute set.
-  </para>
-
-  <para>
-   Example usage:
-<programlisting>f = { a, b }: { result = a+b; }
-  c = lib.makeOverridable f { a = 1; b = 2; }</programlisting>
-  </para>
-
-  <para>
-   The variable <varname>c</varname> is the value of the <varname>f</varname>
-   function applied with some default arguments. Hence the value of
-   <varname>c.result</varname> is <literal>3</literal>, in this example.
-  </para>
-
-  <para>
-   The variable <varname>c</varname> however also has some additional
-   functions, like <link linkend="sec-pkg-override">c.override</link> which can
-   be used to override the default arguments. In this example the value of
-   <varname>(c.override { a = 4; }).result</varname> is 6.
-  </para>
- </section>
-</section>
--- a/doc/functions/shell.xml
+++ b/doc/functions/shell.xml
@@ -1,26 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-pkgs-mkShell">
- <title>pkgs.mkShell</title>
-
- <para>
-  <function>pkgs.mkShell</function> is a special kind of derivation that is
-  only useful when using it combined with <command>nix-shell</command>. It will
-  in fact fail to instantiate when invoked with <command>nix-build</command>.
- </para>
-
- <section xml:id="sec-pkgs-mkShell-usage">
-  <title>Usage</title>
-
-<programlisting><![CDATA[
-{ pkgs ? import <nixpkgs> {} }:
-pkgs.mkShell {
-  # this will make all the build inputs from hello and gnutar
-  # available to the shell environment
-  inputsFrom = with pkgs; [ hello gnutar ];
-  buildInputs = [ pkgs.gnumake ];
-}
-]]></programlisting>
- </section>
-</section>
--- a/doc/haskell-users-guide.md
+++ b/doc/haskell-users-guide.md
@@ -0,0 +1,784 @@
+---
+title: User's Guide for Haskell in Nixpkgs
+author: Peter Simons
+date: 2015-06-01
+---
+# User's Guide to the Haskell Infrastructure
+
+
+## How to install Haskell packages
+
+Nixpkgs distributes build instructions for all Haskell packages registered on
+[Hackage](http://hackage.haskell.org/), but strangely enough normal Nix package
+lookups don't seem to discover any of them, except for the default version of ghc, cabal-install, and stack:
+
+    $ nix-env -i alex
+    error: selector ‘alex’ matches no derivations
+    $ nix-env -qa ghc
+    ghc-7.10.2
+
+The Haskell package set is not registered in the top-level namespace because it
+is *huge*. If all Haskell packages were visible to these commands, then
+name-based search/install operations would be much slower than they are now. We
+avoided that by keeping all Haskell-related packages in a separate attribute
+set called `haskellPackages`, which the following command will list:
+
+    $ nix-env -f "<nixpkgs>" -qaP -A haskellPackages
+    haskellPackages.a50         a50-0.5
+    haskellPackages.abacate     haskell-abacate-0.0.0.0
+    haskellPackages.abcBridge   haskell-abcBridge-0.12
+    haskellPackages.afv         afv-0.1.1
+    haskellPackages.alex        alex-3.1.4
+    haskellPackages.Allure      Allure-0.4.101.1
+    haskellPackages.alms        alms-0.6.7
+    [... some 8000 entries omitted  ...]
+
+To install any of those packages into your profile, refer to them by their
+attribute path (first column):
+
+    $ nix-env -f "<nixpkgs>" -iA haskellPackages.Allure ...
+
+The attribute path of any Haskell packages corresponds to the name of that
+particular package on Hackage: the package `cabal-install` has the attribute
+`haskellPackages.cabal-install`, and so on. (Actually, this convention causes
+trouble with packages like `3dmodels` and `4Blocks`, because these names are
+invalid identifiers in the Nix language. The issue of how to deal with these
+rare corner cases is currently unresolved.)
+
+Haskell packages who's Nix name (second column) begins with a `haskell-` prefix
+are packages that provide a library whereas packages without that prefix
+provide just executables. Libraries may provide executables too, though: the
+package `haskell-pandoc`, for example, installs both a library and an
+application. You can install and use Haskell executables just like any other
+program in Nixpkgs, but using Haskell libraries for development is a bit
+trickier and we'll address that subject in great detail in section [How to
+create a development environment].
+
+Attribute paths are deterministic inside of Nixpkgs, but the path necessary to
+reach Nixpkgs varies from system to system. We dodged that problem by giving
+`nix-env` an explicit `-f "<nixpkgs>"` parameter, but if you call `nix-env`
+without that flag, then chances are the invocation fails:
+
+    $ nix-env -iA haskellPackages.cabal-install
+    error: attribute ‘haskellPackages’ in selection path
+           ‘haskellPackages.cabal-install’ not found
+
+On NixOS, for example, Nixpkgs does *not* exist in the top-level namespace by
+default. To figure out the proper attribute path, it's easiest to query for the
+path of a well-known Nixpkgs package, i.e.:
+
+    $ nix-env -qaP coreutils
+    nixos.coreutils  coreutils-8.23
+
+If your system responds like that (most NixOS installations will), then the
+attribute path to `haskellPackages` is `nixos.haskellPackages`. Thus, if you
+want to use `nix-env` without giving an explicit `-f` flag, then that's the way
+to do it:
+
+    $ nix-env -qaP -A nixos.haskellPackages
+    $ nix-env -iA nixos.haskellPackages.cabal-install
+
+Our current default compiler is GHC 7.10.x and the `haskellPackages` set
+contains packages built with that particular version. Nixpkgs contains the
+latest major release of every GHC since 6.10.4, however, and there is a whole
+family of package sets available that defines Hackage packages built with each
+of those compilers, too:
+
+    $ nix-env -f "<nixpkgs>" -qaP -A haskell.packages.ghc6123
+    $ nix-env -f "<nixpkgs>" -qaP -A haskell.packages.ghc763
+
+The name `haskellPackages` is really just a synonym for
+`haskell.packages.ghc7102`, because we prefer that package set internally and
+recommend it to our users as their default choice, but ultimately you are free
+to compile your Haskell packages with any GHC version you please. The following
+command displays the complete list of available compilers:
+
+    $ nix-env -f "<nixpkgs>" -qaP -A haskell.compiler
+    haskell.compiler.ghc6104        ghc-6.10.4
+    haskell.compiler.ghc6123        ghc-6.12.3
+    haskell.compiler.ghc704         ghc-7.0.4
+    haskell.compiler.ghc722         ghc-7.2.2
+    haskell.compiler.ghc742         ghc-7.4.2
+    haskell.compiler.ghc763         ghc-7.6.3
+    haskell.compiler.ghc784         ghc-7.8.4
+    haskell.compiler.ghc7102        ghc-7.10.2
+    haskell.compiler.ghcHEAD        ghc-7.11.20150402
+    haskell.compiler.ghcNokinds     ghc-nokinds-7.11.20150704
+    haskell.compiler.ghcjs          ghcjs-0.1.0
+    haskell.compiler.jhc            jhc-0.8.2
+    haskell.compiler.uhc            uhc-1.1.9.0
+
+We have no package sets for `jhc` or `uhc` yet, unfortunately, but for every
+version of GHC listed above, there exists a package set based on that compiler.
+Also, the attributes `haskell.compiler.ghcXYC` and
+`haskell.packages.ghcXYC.ghc` are synonymous for the sake of convenience.
+
+## How to create a development environment
+
+### How to install a compiler
+
+A simple development environment consists of a Haskell compiler and one or both
+of the tools `cabal-install` and `stack`. We saw in section
+[How to install Haskell packages] how you can install those programs into your
+user profile:
+
+    $ nix-env -f "<nixpkgs>" -iA haskellPackages.ghc haskellPackages.cabal-install
+
+Instead of the default package set `haskellPackages`, you can also use the more
+precise name `haskell.compiler.ghc7102`, which has the advantage that it refers
+to the same GHC version regardless of what Nixpkgs considers "default" at any
+given time.
+
+Once you've made those tools available in `$PATH`, it's possible to build
+Hackage packages the same way people without access to Nix do it all the time:
+
+    $ cabal get lens-4.11 && cd lens-4.11
+    $ cabal install -j --dependencies-only
+    $ cabal configure
+    $ cabal build
+
+If you enjoy working with Cabal sandboxes, then that's entirely possible too:
+just execute the command
+
+    $ cabal sandbox init
+
+before installing the required dependencies.
+
+The `nix-shell` utility makes it easy to switch to a different compiler
+version; just enter the Nix shell environment with the command
+
+    $ nix-shell -p haskell.compiler.ghc784
+
+to bring GHC 7.8.4 into `$PATH`. Alternatively, you can use Stack instead of
+`nix-shell` directly to select compiler versions and other build tools
+per-project. It uses `nix-shell` under the hood when Nix support is turned on.
+See [How to build a Haskell project using Stack].
+
+If you're using `cabal-install`, re-running `cabal configure` inside the spawned
+shell switches your build to use that compiler instead. If you're working on
+a project that doesn't depend on any additional system libraries outside of GHC,
+then it's even sufficient to just run the `cabal configure` command inside of
+the shell:
+
+    $ nix-shell -p haskell.compiler.ghc784 --command "cabal configure"
+
+Afterwards, all other commands like `cabal build` work just fine in any shell
+environment, because the configure phase recorded the absolute paths to all
+required tools like GHC in its build configuration inside of the `dist/`
+directory. Please note, however, that `nix-collect-garbage` can break such an
+environment because the Nix store paths created by `nix-shell` aren't "alive"
+anymore once `nix-shell` has terminated. If you find that your Haskell builds
+no longer work after garbage collection, then you'll have to re-run `cabal
+configure` inside of a new `nix-shell` environment.
+
+### How to install a compiler with libraries
+
+GHC expects to find all installed libraries inside of its own `lib` directory.
+This approach works fine on traditional Unix systems, but it doesn't work for
+Nix, because GHC's store path is immutable once it's built. We cannot install
+additional libraries into that location. As a consequence, our copies of GHC
+don't know any packages except their own core libraries, like `base`,
+`containers`, `Cabal`, etc.
+
+We can register additional libraries to GHC, however, using a special build
+function called `ghcWithPackages`. That function expects one argument: a
+function that maps from an attribute set of Haskell packages to a list of
+packages, which determines the libraries known to that particular version of
+GHC. For example, the Nix expression `ghcWithPackages (pkgs: [pkgs.mtl])`
+generates a copy of GHC that has the `mtl` library registered in addition to
+its normal core packages:
+
+    $ nix-shell -p "haskellPackages.ghcWithPackages (pkgs: [pkgs.mtl])"
+
+    [nix-shell:~]$ ghc-pkg list mtl
+    /nix/store/zy79...-ghc-7.10.2/lib/ghc-7.10.2/package.conf.d:
+        mtl-2.2.1
+
+This function allows users to define their own development environment by means
+of an override. After adding the following snippet to `~/.nixpkgs/config.nix`,
+
+    {
+      packageOverrides = super: let self = super.pkgs; in
+      {
+        myHaskellEnv = self.haskell.packages.ghc7102.ghcWithPackages
+                         (haskellPackages: with haskellPackages; [
+                           # libraries
+                           arrows async cgi criterion
+                           # tools
+                           cabal-install haskintex
+                         ]);
+      };
+    }
+
+it's possible to install that compiler with `nix-env -f "<nixpkgs>" -iA
+myHaskellEnv`. If you'd like to switch that development environment to a
+different version of GHC, just replace the `ghc7102` bit in the previous
+definition with the appropriate name. Of course, it's also possible to define
+any number of these development environments! (You can't install two of them
+into the same profile at the same time, though, because that would result in
+file conflicts.)
+
+The generated `ghc` program is a wrapper script that re-directs the real
+GHC executable to use a new `lib` directory --- one that we specifically
+constructed to contain all those packages the user requested:
+
+    $ cat $(type -p ghc)
+    #! /nix/store/xlxj...-bash-4.3-p33/bin/bash -e
+    export NIX_GHC=/nix/store/19sm...-ghc-7.10.2/bin/ghc
+    export NIX_GHCPKG=/nix/store/19sm...-ghc-7.10.2/bin/ghc-pkg
+    export NIX_GHC_DOCDIR=/nix/store/19sm...-ghc-7.10.2/share/doc/ghc/html
+    export NIX_GHC_LIBDIR=/nix/store/19sm...-ghc-7.10.2/lib/ghc-7.10.2
+    exec /nix/store/j50p...-ghc-7.10.2/bin/ghc "-B$NIX_GHC_LIBDIR" "$@"
+
+The variables `$NIX_GHC`, `$NIX_GHCPKG`, etc. point to the *new* store path
+`ghcWithPackages` constructed specifically for this environment. The last line
+of the wrapper script then executes the real `ghc`, but passes the path to the
+new `lib` directory using GHC's `-B` flag.
+
+The purpose of those environment variables is to work around an impurity in the
+popular [ghc-paths](http://hackage.haskell.org/package/ghc-paths) library. That
+library promises to give its users access to GHC's installation paths. Only,
+the library can't possible know that path when it's compiled, because the path
+GHC considers its own is determined only much later, when the user configures
+it through `ghcWithPackages`. So we [patched
+ghc-paths](https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/patches/ghc-paths-nix.patch)
+to return the paths found in those environment variables at run-time rather
+than trying to guess them at compile-time.
+
+To make sure that mechanism works properly all the time, we recommend that you
+set those variables to meaningful values in your shell environment, too, i.e.
+by adding the following code to your `~/.bashrc`:
+
+    if type >/dev/null 2>&1 -p ghc; then
+      eval "$(egrep ^export "$(type -p ghc)")"
+    fi
+
+If you are certain that you'll use only one GHC environment which is located in
+your user profile, then you can use the following code, too, which has the
+advantage that it doesn't contain any paths from the Nix store, i.e. those
+settings always remain valid even if a `nix-env -u` operation updates the GHC
+environment in your profile:
+
+    if [ -e ~/.nix-profile/bin/ghc ]; then
+      export NIX_GHC="$HOME/.nix-profile/bin/ghc"
+      export NIX_GHCPKG="$HOME/.nix-profile/bin/ghc-pkg"
+      export NIX_GHC_DOCDIR="$HOME/.nix-profile/share/doc/ghc/html"
+      export NIX_GHC_LIBDIR="$HOME/.nix-profile/lib/ghc-$($NIX_GHC --numeric-version)"
+    fi
+
+### How to install a compiler with libraries, hoogle and documentation indexes
+
+If you plan to use your environment for interactive programming, not just
+compiling random Haskell code, you might want to replace `ghcWithPackages` in
+all the listings above with `ghcWithHoogle`.
+
+This environment generator not only produces an environment with GHC and all
+the specified libraries, but also generates a `hoogle` and `haddock` indexes
+for all the packages, and provides a wrapper script around `hoogle` binary that
+uses all those things. A precise name for this thing would be
+"`ghcWithPackagesAndHoogleAndDocumentationIndexes`", which is, regrettably, too
+long and scary.
+
+For example, installing the following environment
+
+    {
+      packageOverrides = super: let self = super.pkgs; in
+      {
+        myHaskellEnv = self.haskellPackages.ghcWithHoogle
+                         (haskellPackages: with haskellPackages; [
+                           # libraries
+                           arrows async cgi criterion
+                           # tools
+                           cabal-install haskintex
+                         ]);
+      };
+    }
+
+allows one to browse module documentation index [not too dissimilar to
+this](https://downloads.haskell.org/~ghc/latest/docs/html/libraries/index.html)
+for all the specified packages and their dependencies by directing a browser of
+choice to `~/.nix-profiles/share/doc/hoogle/index.html` (or
+`/run/current-system/sw/share/doc/hoogle/index.html` in case you put it in
+`environment.systemPackages` in NixOS).
+
+After you've marveled enough at that try adding the following to your
+`~/.ghc/ghci.conf`
+
+    :def hoogle \s -> return $ ":! hoogle search -cl --count=15 \"" ++ s ++ "\""
+    :def doc \s -> return $ ":! hoogle search -cl --info \"" ++ s ++ "\""
+
+and test it by typing into `ghci`:
+
+    :hoogle a -> a
+    :doc a -> a
+
+Be sure to note the links to `haddock` files in the output. With any modern and
+properly configured terminal emulator you can just click those links to
+navigate there.
+
+Finally, you can run
+
+    hoogle server -p 8080
+
+and navigate to http://localhost:8080/ for your own local
+[Hoogle](https://www.haskell.org/hoogle/). Note, however, that Firefox and
+possibly other browsers disallow navigation from `http:` to `file:` URIs for
+security reasons, which might be quite an inconvenience. See [this
+page](http://kb.mozillazine.org/Links_to_local_pages_do_not_work) for
+workarounds.
+
+### How to build a Haskell project using Stack
+
+[Stack][http://haskellstack.org] is a popular build tool for Haskell projects.
+It has first-class support for Nix. Stack can optionally use Nix to
+automatically select the right version of GHC and other build tools to build,
+test and execute apps in an existing project downloaded from somewhere on the
+Internet. Pass the `--nix` flag to any `stack` command to do so, e.g.
+
+    $ git clone --recursive http://github.com/yesodweb/wai
+    $ cd wai
+    $ stack --nix build
+
+If you want `stack` to use Nix by default, you can add a `nix` section to the
+`stack.yaml` file, as explained in the [Stack documentation][stack-nix-doc]. For
+example:
+
+    nix:
+      enable: true
+      packages: [pkgconfig zeromq zlib]
+
+The example configuration snippet above tells Stack to create an ad hoc
+environment for `nix-shell` as in the below section, in which the `pkgconfig`,
+`zeromq` and `zlib` packages from Nixpkgs are available. All `stack` commands
+will implicitly be executed inside this ad hoc environment.
+
+Some projects have more sophisticated needs. For examples, some ad hoc
+environments might need to expose Nixpkgs packages compiled in a certain way, or
+with extra environment variables. In these cases, you'll need a `shell` field
+instead of `packages`:
+
+    nix:
+      enable: true
+      shell-file: shell.nix
+
+For more on how to write a `shell.nix` file see the below section. You'll need
+to express a derivation. Note that Nixpkgs ships with a convenience wrapper
+function around `mkDerivation` called `haskell.lib.buildStackProject` to help you
+create this derivation in exactly the way Stack expects. All of the same inputs
+as `mkDerivation` can be provided. For example, to build a Stack project that
+including packages that link against a version of the R library compiled with
+special options turned on:
+
+    with (import <nixpkgs> { });
+
+    let R = pkgs.R.override { enableStrictBarrier = true; };
+    in
+	haskell.lib.buildStackProject {
+      name = "HaskellR";
+	  buildInputs = [ R zeromq zlib ];
+    }
+
+[stack-nix-doc]: http://docs.haskellstack.org/en/stable/nix_integration.html
+
+### How to create ad hoc environments for `nix-shell`
+
+The easiest way to create an ad hoc development environment is to run
+`nix-shell` with the appropriate GHC environment given on the command-line:
+
+    nix-shell -p "haskellPackages.ghcWithPackages (pkgs: with pkgs; [mtl pandoc])"
+
+For more sophisticated use-cases, however, it's more convenient to save the
+desired configuration in a file called `shell.nix` that looks like this:
+
+    { nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }:
+    let
+      inherit (nixpkgs) pkgs;
+      ghc = pkgs.haskell.packages.${compiler}.ghcWithPackages (ps: with ps; [
+              monad-par mtl
+            ]);
+    in
+    pkgs.stdenv.mkDerivation {
+      name = "my-haskell-env-0";
+      buildInputs = [ ghc ];
+      shellHook = "eval $(egrep ^export ${ghc}/bin/ghc)";
+    }
+
+Now run `nix-shell` --- or even `nix-shell --pure` --- to enter a shell
+environment that has the appropriate compiler in `$PATH`. If you use `--pure`,
+then add all other packages that your development environment needs into the
+`buildInputs` attribute. If you'd like to switch to a different compiler
+version, then pass an appropriate `compiler` argument to the expression, i.e.
+`nix-shell --argstr compiler ghc784`.
+
+If you need such an environment because you'd like to compile a Hackage package
+outside of Nix --- i.e. because you're hacking on the latest version from Git
+---, then the package set provides suitable nix-shell environments for you
+already! Every Haskell package has an `env` attribute that provides a shell
+environment suitable for compiling that particular package. If you'd like to
+hack the `lens` library, for example, then you just have to check out the
+source code and enter the appropriate environment:
+
+      $ cabal get lens-4.11 && cd lens-4.11
+      Downloading lens-4.11...
+      Unpacking to lens-4.11/
+
+      $ nix-shell "<nixpkgs>" -A haskellPackages.lens.env
+      [nix-shell:/tmp/lens-4.11]$
+
+At point, you can run `cabal configure`, `cabal build`, and all the other
+development commands. Note that you need `cabal-install` installed in your
+`$PATH` already to use it here --- the `nix-shell` environment does not provide
+it.
+
+## How to create Nix builds for your own private Haskell packages
+
+If your own Haskell packages have build instructions for Cabal, then you can
+convert those automatically into build instructions for Nix using the
+`cabal2nix` utility, which you can install into your profile by running
+`nix-env -i cabal2nix`.
+
+### How to build a stand-alone project
+
+For example, let's assume that you're working on a private project called
+`foo`. To generate a Nix build expression for it, change into the project's
+top-level directory and run the command:
+
+    $ cabal2nix . >foo.nix
+
+Then write the following snippet into a file called `default.nix`:
+
+    { nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }:
+    nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./foo.nix { }
+
+Finally, store the following code in a file called `shell.nix`:
+
+    { nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }:
+    (import ./default.nix { inherit nixpkgs compiler; }).env
+
+At this point, you can run `nix-build` to have Nix compile your project and
+install it into a Nix store path. The local directory will contain a symlink
+called `result` after `nix-build` returns that points into that location. Of
+course, passing the flag `--argstr compiler ghc763` allows switching the build
+to any version of GHC currently supported.
+
+Furthermore, you can call `nix-shell` to enter an interactive development
+environment in which you can use `cabal configure` and `cabal build` to develop
+your code. That environment will automatically contain a proper GHC derivation
+with all the required libraries registered as well as all the system-level
+libraries your package might need.
+
+If your package does not depend on any system-level libraries, then it's
+sufficient to run
+
+    $ nix-shell --command "cabal configure"
+
+once to set up your build. `cabal-install` determines the absolute paths to all
+resources required for the build and writes them into a config file in the
+`dist/` directory. Once that's done, you can run `cabal build` and any other
+command for that project even outside of the `nix-shell` environment. This
+feature is particularly nice for those of us who like to edit their code with
+an IDE, like Emacs' `haskell-mode`, because it's not necessary to start Emacs
+inside of nix-shell just to make it find out the necessary settings for
+building the project; `cabal-install` has already done that for us.
+
+If you want to do some quick-and-dirty hacking and don't want to bother setting
+up a `default.nix` and `shell.nix` file manually, then you can use the
+`--shell` flag offered by `cabal2nix` to have it generate a stand-alone
+`nix-shell` environment for you. With that feature, running
+
+    $ cabal2nix --shell . >shell.nix
+    $ nix-shell --command "cabal configure"
+
+is usually enough to set up a build environment for any given Haskell package.
+You can even use that generated file to run `nix-build`, too:
+
+    $ nix-build shell.nix
+
+### How to build projects that depend on each other
+
+If you have multiple private Haskell packages that depend on each other, then
+you'll have to register those packages in the Nixpkgs set to make them visible
+for the dependency resolution performed by `callPackage`. First of all, change
+into each of your projects top-level directories and generate a `default.nix`
+file with `cabal2nix`:
+
+    $ cd ~/src/foo && cabal2nix . >default.nix
+    $ cd ~/src/bar && cabal2nix . >default.nix
+
+Then edit your `~/.nixpkgs/config.nix` file to register those builds in the
+default Haskell package set:
+
+      {
+        packageOverrides = super: let self = super.pkgs; in
+        {
+          haskellPackages = super.haskellPackages.override {
+            overrides = self: super: {
+              foo = self.callPackage ../src/foo {};
+              bar = self.callPackage ../src/bar {};
+            };
+          };
+        };
+      }
+
+Once that's accomplished, `nix-env -f "<nixpkgs>" -qA haskellPackages` will
+show your packages like any other package from Hackage, and you can build them
+
+    $ nix-build "<nixpkgs>" -A haskellPackages.foo
+
+or enter an interactive shell environment suitable for building them:
+
+    $ nix-shell "<nixpkgs>" -A haskellPackages.bar.env
+
+## Miscellaneous Topics
+
+### How to build with profiling enabled
+
+Every Haskell package set takes a function called `overrides` that you can use
+to manipulate the package as much as you please. One useful application of this
+feature is to replace the default `mkDerivation` function with one that enables
+library profiling for all packages. To accomplish that, add configure the
+following snippet in your `~/.nixpkgs/config.nix` file:
+
+    {
+      packageOverrides = super: let self = super.pkgs; in
+      {
+        profiledHaskellPackages = self.haskellPackages.override {
+          overrides = self: super: {
+            mkDerivation = args: super.mkDerivation (args // {
+              enableLibraryProfiling = true;
+            });
+          };
+        };
+      };
+    }
+
+Then, replace instances of `haskellPackages` in the `cabal2nix`-generated
+`default.nix` or `shell.nix` files with `profiledHaskellPackages`.
+
+### How to override package versions in a compiler-specific package set
+
+Nixpkgs provides the latest version of
+[`ghc-events`](http://hackage.haskell.org/package/ghc-events), which is 0.4.4.0
+at the time of this writing. This is fine for users of GHC 7.10.x, but GHC
+7.8.4 cannot compile that binary. Now, one way to solve that problem is to
+register an older version of `ghc-events` in the 7.8.x-specific package set.
+The first step is to generate Nix build instructions with `cabal2nix`:
+
+    $ cabal2nix cabal://ghc-events-0.4.3.0 >~/.nixpkgs/ghc-events-0.4.3.0.nix
+
+Then add the override in `~/.nixpkgs/config.nix`:
+
+    {
+      packageOverrides = super: let self = super.pkgs; in
+      {
+        haskell = super.haskell // {
+          packages = super.haskell.packages // {
+            ghc784 = super.haskell.packages.ghc784.override {
+              overrides = self: super: {
+                ghc-events = self.callPackage ./ghc-events-0.4.3.0.nix {};
+              };
+            };
+          };
+        };
+      };
+    }
+
+This code is a little crazy, no doubt, but it's necessary because the intuitive
+version
+
+    haskell.packages.ghc784 = super.haskell.packages.ghc784.override {
+      overrides = self: super: {
+        ghc-events = self.callPackage ./ghc-events-0.4.3.0.nix {};
+      };
+    };
+
+doesn't do what we want it to: that code replaces the `haskell` package set in
+Nixpkgs with one that contains only one entry,`packages`, which contains only
+one entry `ghc784`. This override loses the `haskell.compiler` set, and it
+loses the `haskell.packages.ghcXYZ` sets for all compilers but GHC 7.8.4. To
+avoid that problem, we have to perform the convoluted little dance from above,
+iterating over each step in hierarchy.
+
+Once it's accomplished, however, we can install a variant of `ghc-events`
+that's compiled with GHC 7.8.4:
+
+    nix-env -f "<nixpkgs>" -iA haskell.packages.ghc784.ghc-events
+
+Unfortunately, it turns out that this build fails again while executing the
+test suite! Apparently, the release archive on Hackage is missing some data
+files that the test suite requires, so we cannot run it. We accomplish that by
+re-generating the Nix expression with the `--no-check` flag:
+
+    $ cabal2nix --no-check cabal://ghc-events-0.4.3.0 >~/.nixpkgs/ghc-events-0.4.3.0.nix
+
+Now the builds succeeds.
+
+Of course, in the concrete example of `ghc-events` this whole exercise is not
+an ideal solution, because `ghc-events` can analyze the output emitted by any
+version of GHC later than 6.12 regardless of the compiler version that was used
+to build the `ghc-events' executable, so strictly speaking there's no reason to
+prefer one built with GHC 7.8.x in the first place. However, for users who
+cannot use GHC 7.10.x at all for some reason, the approach of downgrading to an
+older version might be useful.
+
+### How to recover from GHC's infamous non-deterministic library ID bug
+
+GHC and distributed build farms don't get along well:
+
+    https://ghc.haskell.org/trac/ghc/ticket/4012
+
+When you see an error like this one
+
+    package foo-0.7.1.0 is broken due to missing package
+    text-1.2.0.4-98506efb1b9ada233bb5c2b2db516d91
+
+then you have to download and re-install `foo` and all its dependents from
+scratch:
+
+    # nix-store -q --referrers /nix/store/*-haskell-text-1.2.0.4 \
+      | xargs -L 1 nix-store --repair-path --option binary-caches http://hydra.nixos.org
+
+If you're using additional Hydra servers other than `hydra.nixos.org`, then it
+might be necessary to purge the local caches that store data from those
+machines to disable these binary channels for the duration of the previous
+command, i.e. by running:
+
+    rm /nix/var/nix/binary-cache-v3.sqlite
+    rm /nix/var/nix/manifests/*
+    rm /nix/var/nix/channel-cache/*
+
+### Builds on Darwin fail with `math.h` not found
+
+Users of GHC on Darwin have occasionally reported that builds fail, because the
+compiler complains about a missing include file:
+
+    fatal error: 'math.h' file not found
+
+The issue has been discussed at length in [ticket
+6390](https://github.com/NixOS/nixpkgs/issues/6390), and so far no good
+solution has been proposed. As a work-around, users who run into this problem
+can configure the environment variables
+
+    export NIX_CFLAGS_COMPILE="-idirafter /usr/include"
+    export NIX_CFLAGS_LINK="-L/usr/lib"
+
+in their `~/.bashrc` file to avoid the compiler error.
+
+### Builds using Stack complain about missing system libraries
+
+    --  While building package zlib-0.5.4.2 using:
+      runhaskell -package=Cabal-1.22.4.0 -clear-package-db [... lots of flags ...]
+    Process exited with code: ExitFailure 1
+    Logs have been written to: /home/foo/src/stack-ide/.stack-work/logs/zlib-0.5.4.2.log
+
+    Configuring zlib-0.5.4.2...
+    Setup.hs: Missing dependency on a foreign library:
+    * Missing (or bad) header file: zlib.h
+    This problem can usually be solved by installing the system package that
+    provides this library (you may need the "-dev" version). If the library is
+    already installed but in a non-standard location then you can use the flags
+    --extra-include-dirs= and --extra-lib-dirs= to specify where it is.
+    If the header file does exist, it may contain errors that are caught by the C
+    compiler at the preprocessing stage. In this case you can re-run configure
+    with the verbosity flag -v3 to see the error messages.
+
+When you run the build inside of the nix-shell environment, the system
+is configured to find libz.so without any special flags -- the compiler
+and linker "just know" how to find it. Consequently, Cabal won't record
+any search paths for libz.so in the package description, which means
+that the package works fine inside of nix-shell, but once you leave the
+shell the shared object can no longer be found. That issue is by no
+means specific to Stack: you'll have that problem with any other
+Haskell package that's built inside of nix-shell but run outside of that
+environment.
+
+You can remedy this issue in several ways. The easiest is to add a `nix` section
+to the `stack.yaml` like the following:
+
+    nix:
+      enable: true
+	  packages: [ zlib ]
+
+Stack's Nix support knows to add `${zlib}/lib` and `${zlib}/include` as an
+`--extra-lib-dirs` and `extra-include-dirs`, respectively. Alternatively, you
+can achieve the same effect by hand. First of all, run
+
+    $ nix-build --no-out-link "<nixpkgs>" -A zlib
+    /nix/store/alsvwzkiw4b7ip38l4nlfjijdvg3fvzn-zlib-1.2.8
+
+to find out the store path of the system's zlib library. Now, you can
+
+1) add that path (plus a "/lib" suffix) to your $LD_LIBRARY_PATH
+   environment variable to make sure your system linker finds libz.so
+   automatically. It's no pretty solution, but it will work.
+
+2) As a variant of (1), you can also install any number of system
+   libraries into your user's profile (or some other profile) and point
+   $LD_LIBRARY_PATH to that profile instead, so that you don't have to
+   list dozens of those store paths all over the place.
+
+3) The solution I prefer is to call stack with an appropriate
+   --extra-lib-dirs flag like so:
+
+    $ stack --extra-lib-dirs=/nix/store/alsvwzkiw4b7ip38l4nlfjijdvg3fvzn-zlib-1.2.8/lib build
+
+   Typically, you'll need --extra-include-dirs as well. It's possible
+   to add those flag to the project's "stack.yaml" or your user's
+   global "~/.stack/global/stack.yaml" file so that you don't have to
+   specify them manually every time. But again, you're likely better off using
+   Stack's Nix support instead.
+
+   The same thing applies to `cabal configure`, of course, if you're
+   building with `cabal-install` instead of Stack.
+
+### Creating statically linked binaries
+
+There are two levels of static linking. The first option is to configure the
+build with the Cabal flag `--disable-executable-dynamic`. In Nix expressions,
+this can be achieved by setting the attribute:
+
+    enableSharedExecutables = false;
+
+That gives you a binary with statically linked Haskell libraries and
+dynamically linked system libraries.
+
+To link both Haskell libraries and system libraries statically, the additional
+flags `--ghc-option=-optl=-static --ghc-option=-optl=-pthread` need to be used.
+In Nix, this is accomplished with:
+
+    configureFlags = [ "--ghc-option=-optl=-static" "--ghc-option=-optl=-pthread" ];
+
+It's important to realize, however, that most system libraries in Nix are built
+as shared libraries only, i.e. there is just no static library available that
+Cabal could link!
+
+
+## Other resources
+
+- The Youtube video [Nix Loves Haskell](https://www.youtube.com/watch?v=BsBhi_r-OeE)
+  provides an introduction into Haskell NG aimed at beginners. The slides are
+  available at http://cryp.to/nixos-meetup-3-slides.pdf and also -- in a form
+  ready for cut & paste -- at
+  https://github.com/NixOS/cabal2nix/blob/master/doc/nixos-meetup-3-slides.md.
+
+- Another Youtube video is [Escaping Cabal Hell with Nix](https://www.youtube.com/watch?v=mQd3s57n_2Y),
+  which discusses the subject of Haskell development with Nix but also provides
+  a basic introduction to Nix as well, i.e. it's suitable for viewers with
+  almost no prior Nix experience.
+
+- Oliver Charles wrote a very nice [Tutorial how to develop Haskell packages with Nix](http://wiki.ocharles.org.uk/Nix).
+
+- The *Journey into the Haskell NG infrastructure* series of postings
+  describe the new Haskell infrastructure in great detail:
+
+    - [Part 1](http://lists.science.uu.nl/pipermail/nix-dev/2015-January/015591.html)
+      explains the differences between the old and the new code and gives
+      instructions how to migrate to the new setup.
+
+    - [Part 2](http://lists.science.uu.nl/pipermail/nix-dev/2015-January/015608.html)
+      looks in-depth at how to tweak and configure your setup by means of
+      overrides.
+
+    - [Part 3](http://lists.science.uu.nl/pipermail/nix-dev/2015-April/016912.html)
+      describes the infrastructure that keeps the Haskell package set in Nixpkgs
+      up-to-date.
--- a/doc/introduction.chapter.md
+++ b/doc/introduction.chapter.md
@@ -1,51 +0,0 @@
---
-title: Introduction
-author: Frederik Rietdijk
-date: 2015-11-25
---
-
-# Introduction
-
-The Nix Packages collection (Nixpkgs) is a set of thousands of packages for the
-[Nix package manager](http://nixos.org/nix/), released under a
-[permissive MIT/X11 license](https://github.com/NixOS/nixpkgs/blob/master/COPYING).
-Packages are available for several platforms, and can be used with the Nix
-package manager on most GNU/Linux distributions as well as NixOS.
-
-This manual primarily describes how to write packages for the Nix Packages collection
-(Nixpkgs). Thus it’s mainly for packagers and developers who want to add packages to
-Nixpkgs. If you like to learn more about the Nix package manager and the Nix
-expression language, then you are kindly referred to the [Nix manual](http://nixos.org/nix/manual/).
-
-## Overview of Nixpkgs
-
-Nix expressions describe how to build packages from source and are collected in
-the [nixpkgs repository](https://github.com/NixOS/nixpkgs). Also included in the
-collection are Nix expressions for
-[NixOS modules](http://nixos.org/nixos/manual/index.html#sec-writing-modules).
-With these expressions the Nix package manager can build binary packages.
-
-Packages, including the Nix packages collection, are distributed through
-[channels](http://nixos.org/nix/manual/#sec-channels). The collection is
-distributed for users of Nix on non-NixOS distributions through the channel
-`nixpkgs`. Users of NixOS generally use one of the `nixos-*` channels, e.g.
-`nixos-16.03`, which includes all packages and modules for the stable NixOS
-16.03. Stable NixOS releases are generally only given
-security updates. More up to date packages and modules are available via the
-`nixos-unstable` channel.
-
-Both `nixos-unstable` and `nixpkgs` follow the `master` branch of the Nixpkgs
-repository, although both do lag the `master` branch by generally
-[a couple of days](http://howoldis.herokuapp.com/). Updates to a channel are
-distributed as soon as all tests for that channel pass, e.g.
-[this table](http://hydra.nixos.org/job/nixpkgs/trunk/unstable#tabs-constituents)
-shows the status of tests for the `nixpkgs` channel.
-
-The tests are conducted by a cluster called [Hydra](http://nixos.org/hydra/),
-which also builds binary packages from the Nix expressions in Nixpkgs for
-`x86_64-linux`, `i686-linux` and `x86_64-darwin`.
-The binaries are made available via a [binary cache](https://cache.nixos.org).
-
-The current Nix expressions of the channels are available in the
-[`nixpkgs-channels`](https://github.com/NixOS/nixpkgs-channels) repository,
-which has branches corresponding to the available channels.
--- a/doc/introduction.md
+++ b/doc/introduction.md
@@ -0,0 +1,48 @@
+---
+title: Introduction
+author: Frederik Rietdijk
+date: 2015-11-25
+---
+
+# Introduction
+
+The Nix Packages collection (Nixpkgs) is a set of over 30,000 packages for the
+[Nix package manager](http://nixos.org/nix/), released under a [permissive MIT/X11 license](https://github.com/NixOS/nixpkgs/blob/master/COPYING).
+Packages are available for several architectures, and can be used with the Nix package manager
+on most GNU/Linux distributions as well as NixOS.
+
+This manual describes how to write packages for the Nix Packages collection
+(Nixpkgs). Thus it’s for packagers and developers who want to add packages to
+Nixpkgs. If you like to learn more about the Nix package manager and the Nix
+expression language, then you are kindly referred to the [Nix manual](http://nixos.org/nix/manual/).
+
+## Overview of Nixpkgs
+
+Nix expressions describe how to build packages from source and are collected in
+the [nixpkgs repository](https://github.com/NixOS/nixpkgs). Also included in the
+collection are Nix expressions for [NixOS modules](http://nixos.org/nixos/manual/index.html#sec-writing-modules). With
+these expressions the Nix package manager can build binary packages.
+
+Packages, including the Nix packages collection, are distributed through
+[channels](http://nixos.org/nix/manual/#sec-channels). The collection is
+distributed for users of Nix on non-NixOS distributions through the channel
+`nixpkgs`. Users of NixOS generally use one of the `nixos-*` channels, e.g.
+`nixos-15.09`, which includes all packages and modules for the stable NixOS
+15.09. The channels of the stable NixOS releases are generally only given
+security updates. More up to date packages and modules are available via the
+`nixos-unstable` channel.
+
+Both `nixos-unstable` and `nixpkgs` follow the `master` branch of the Nixpkgs
+repository, although both do lag the `master` branch by generally [a couple of days](http://howoldis.herokuapp.com/). Updates to a channel are distributed as
+soon as all tests for that channel pass, e.g. [this table](http://hydra.nixos.org/job/nixpkgs/trunk/unstable#tabs-constituents)
+shows the status of tests for the `nixpkgs` channel.
+
+The tests are conducted by a cluster called [Hydra](http://nixos.org/hydra/),
+which also builds binary packages from the Nix expressions in Nixpkgs. As soon
+as a channel is updated, the binaries are made available via a [binary cache](https://cache.nixos.org). Until the channel updates, binaries that have
+already been built, are available via [Hydra's binary cache](https://hydra.nixos.org).
+
+The current Nix expressions of the channels are available in the
+[`nixpkgs-channels`](https://github.com/NixOS/nixpkgs-channels) repository,
+which has branches corresponding to the available channels. There is also the
+Nixpkgs Monitor which keeps track of updates and security vulnerabilities.
--- a/doc/languages-frameworks/beam.xml
+++ b/doc/languages-frameworks/beam.xml
@@ -1,528 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-beam">
- <title>BEAM Languages (Erlang, Elixir &amp; LFE)</title>
-
- <section xml:id="beam-introduction">
-  <title>Introduction</title>
-
-  <para>
-   In this document and related Nix expressions, we use the term,
-   <emphasis>BEAM</emphasis>, to describe the environment. BEAM is the name of
-   the Erlang Virtual Machine and, as far as we're concerned, from a packaging
-   perspective, all languages that run on the BEAM are interchangeable. That
-   which varies, like the build system, is transparent to users of any given
-   BEAM package, so we make no distinction.
-  </para>
- </section>
-
- <section xml:id="beam-structure">
-  <title>Structure</title>
-
-  <para>
-   All BEAM-related expressions are available via the top-level
-   <literal>beam</literal> attribute, which includes:
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     <literal>interpreters</literal>: a set of compilers running on the BEAM,
-     including multiple Erlang/OTP versions
-     (<literal>beam.interpreters.erlangR19</literal>, etc), Elixir
-     (<literal>beam.interpreters.elixir</literal>) and LFE
-     (<literal>beam.interpreters.lfe</literal>).
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     <literal>packages</literal>: a set of package sets, each compiled with a
-     specific Erlang/OTP version, e.g.
-     <literal>beam.packages.erlangR19</literal>.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <para>
-   The default Erlang compiler, defined by
-   <literal>beam.interpreters.erlang</literal>, is aliased as
-   <literal>erlang</literal>. The default BEAM package set is defined by
-   <literal>beam.packages.erlang</literal> and aliased at the top level as
-   <literal>beamPackages</literal>.
-  </para>
-
-  <para>
-   To create a package set built with a custom Erlang version, use the lambda,
-   <literal>beam.packagesWith</literal>, which accepts an Erlang/OTP derivation
-   and produces a package set similar to
-   <literal>beam.packages.erlang</literal>.
-  </para>
-
-  <para>
-   Many Erlang/OTP distributions available in
-   <literal>beam.interpreters</literal> have versions with ODBC and/or Java
-   enabled. For example, there's
-   <literal>beam.interpreters.erlangR19_odbc_javac</literal>, which corresponds
-   to <literal>beam.interpreters.erlangR19</literal>.
-  </para>
-
-  <para xml:id="erlang-call-package">
-   We also provide the lambda,
-   <literal>beam.packages.erlang.callPackage</literal>, which simplifies
-   writing BEAM package definitions by injecting all packages from
-   <literal>beam.packages.erlang</literal> into the top-level context.
-  </para>
- </section>
-
- <section xml:id="build-tools">
-  <title>Build Tools</title>
-
-  <section xml:id="build-tools-rebar3">
-   <title>Rebar3</title>
-
-   <para>
-    By default, Rebar3 wants to manage its own dependencies. This is perfectly
-    acceptable in the normal, non-Nix setup, but in the Nix world, it is not.
-    To rectify this, we provide two versions of Rebar3:
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>rebar3</literal>: patched to remove the ability to download
-       anything. When not running it via <literal>nix-shell</literal> or
-       <literal>nix-build</literal>, it's probably not going to work as
-       desired.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       <literal>rebar3-open</literal>: the normal, unmodified Rebar3. It should
-       work exactly as would any other version of Rebar3. Any Erlang package
-       should rely on <literal>rebar3</literal> instead. See
-       <xref
-            linkend="rebar3-packages"/>.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </para>
-  </section>
-
-  <section xml:id="build-tools-other">
-   <title>Mix &amp; Erlang.mk</title>
-
-   <para>
-    Both Mix and Erlang.mk work exactly as expected. There is a bootstrap
-    process that needs to be run for both, however, which is supported by the
-    <literal>buildMix</literal> and <literal>buildErlangMk</literal>
-    derivations, respectively.
-   </para>
-  </section>
- </section>
-
- <section xml:id="how-to-install-beam-packages">
-  <title>How to Install BEAM Packages</title>
-
-  <para>
-   BEAM packages are not registered at the top level, simply because they are
-   not relevant to the vast majority of Nix users. They are installable using
-   the <literal>beam.packages.erlang</literal> attribute set (aliased as
-   <literal>beamPackages</literal>), which points to packages built by the
-   default Erlang/OTP version in Nixpkgs, as defined by
-   <literal>beam.interpreters.erlang</literal>. To list the available packages
-   in <literal>beamPackages</literal>, use the following command:
-  </para>
-
-<programlisting>
-$ nix-env -f &quot;&lt;nixpkgs&gt;&quot; -qaP -A beamPackages
-beamPackages.esqlite    esqlite-0.2.1
-beamPackages.goldrush   goldrush-0.1.7
-beamPackages.ibrowse    ibrowse-4.2.2
-beamPackages.jiffy      jiffy-0.14.5
-beamPackages.lager      lager-3.0.2
-beamPackages.meck       meck-0.8.3
-beamPackages.rebar3-pc  pc-1.1.0
-  </programlisting>
-
-  <para>
-   To install any of those packages into your profile, refer to them by their
-   attribute path (first column):
-  </para>
-
-<programlisting>
-$ nix-env -f &quot;&lt;nixpkgs&gt;&quot; -iA beamPackages.ibrowse
-  </programlisting>
-
-  <para>
-   The attribute path of any BEAM package corresponds to the name of that
-   particular package in <link xlink:href="https://hex.pm">Hex</link> or its
-   OTP Application/Release name.
-  </para>
- </section>
-
- <section xml:id="packaging-beam-applications">
-  <title>Packaging BEAM Applications</title>
-
-  <section  xml:id="packaging-erlang-applications">
-   <title>Erlang Applications</title>
-
-   <section xml:id="rebar3-packages">
-    <title>Rebar3 Packages</title>
-
-    <para>
-     The Nix function, <literal>buildRebar3</literal>, defined in
-     <literal>beam.packages.erlang.buildRebar3</literal> and aliased at the top
-     level, can be used to build a derivation that understands how to build a
-     Rebar3 project. For example, we can build
-     <link
-        xlink:href="https://github.com/erlang-nix/hex2nix">hex2nix</link>
-     as follows:
-    </para>
-
-<programlisting>
-        { stdenv, fetchFromGitHub, buildRebar3, ibrowse, jsx, erlware_commons }:
-
-        buildRebar3 rec {
-          name = "hex2nix";
-          version = "0.0.1";
-
-          src = fetchFromGitHub {
-            owner = "ericbmerritt";
-            repo = "hex2nix";
-            rev = "${version}";
-            sha256 = "1w7xjidz1l5yjmhlplfx7kphmnpvqm67w99hd2m7kdixwdxq0zqg";
-          };
-
-          beamDeps = [ ibrowse jsx erlware_commons ];
-        }
-      </programlisting>
-
-    <para>
-     Such derivations are callable with
-     <literal>beam.packages.erlang.callPackage</literal> (see
-     <xref
-        linkend="erlang-call-package"/>). To call this package using
-     the normal <literal>callPackage</literal>, refer to dependency packages
-     via <literal>beamPackages</literal>, e.g.
-     <literal>beamPackages.ibrowse</literal>.
-    </para>
-
-    <para>
-     Notably, <literal>buildRebar3</literal> includes
-     <literal>beamDeps</literal>, while <literal>stdenv.mkDerivation</literal>
-     does not. BEAM dependencies added there will be correctly handled by the
-     system.
-    </para>
-
-    <para>
-     If a package needs to compile native code via Rebar3's port compilation
-     mechanism, add <literal>compilePort = true;</literal> to the derivation.
-    </para>
-   </section>
-
-   <section xml:id="erlang-mk-packages">
-    <title>Erlang.mk Packages</title>
-
-    <para>
-     Erlang.mk functions similarly to Rebar3, except we use
-     <literal>buildErlangMk</literal> instead of
-     <literal>buildRebar3</literal>.
-    </para>
-
-<programlisting>
-        { buildErlangMk, fetchHex, cowlib, ranch }:
-
-        buildErlangMk {
-          name = "cowboy";
-          version = "1.0.4";
-
-          src = fetchHex {
-            pkg = "cowboy";
-            version = "1.0.4";
-            sha256 = "6a0edee96885fae3a8dd0ac1f333538a42e807db638a9453064ccfdaa6b9fdac";
-          };
-
-          beamDeps = [ cowlib ranch ];
-
-          meta = {
-            description = ''
-              Small, fast, modular HTTP server written in Erlang
-            '';
-            license = stdenv.lib.licenses.isc;
-            homepage = https://github.com/ninenines/cowboy;
-          };
-        }
-      </programlisting>
-   </section>
-
-   <section xml:id="mix-packages">
-    <title>Mix Packages</title>
-
-    <para>
-     Mix functions similarly to Rebar3, except we use
-     <literal>buildMix</literal> instead of <literal>buildRebar3</literal>.
-    </para>
-
-<programlisting>
-        { buildMix, fetchHex, plug, absinthe }:
-
-        buildMix {
-          name = "absinthe_plug";
-          version = "1.0.0";
-
-          src = fetchHex {
-            pkg = "absinthe_plug";
-            version = "1.0.0";
-            sha256 = "08459823fe1fd4f0325a8bf0c937a4520583a5a26d73b193040ab30a1dfc0b33";
-          };
-
-          beamDeps = [ plug absinthe ];
-
-          meta = {
-            description = ''
-              A plug for Absinthe, an experimental GraphQL toolkit
-            '';
-            license = stdenv.lib.licenses.bsd3;
-            homepage = https://github.com/CargoSense/absinthe_plug;
-          };
-        }
-      </programlisting>
-
-    <para>
-     Alternatively, we can use <literal>buildHex</literal> as a shortcut:
-    </para>
-
-<programlisting>
-        { buildHex, buildMix, plug, absinthe }:
-
-        buildHex {
-          name = "absinthe_plug";
-          version = "1.0.0";
-
-          sha256 = "08459823fe1fd4f0325a8bf0c937a4520583a5a26d73b193040ab30a1dfc0b33";
-
-          builder = buildMix;
-
-          beamDeps = [ plug absinthe ];
-
-          meta = {
-            description = ''
-              A plug for Absinthe, an experimental GraphQL toolkit
-            '';
-            license = stdenv.lib.licenses.bsd3;
-            homepage = https://github.com/CargoSense/absinthe_plug;
-         };
-       }
-      </programlisting>
-   </section>
-  </section>
- </section>
-
- <section xml:id="how-to-develop">
-  <title>How to Develop</title>
-
-  <section xml:id="accessing-an-environment">
-   <title>Accessing an Environment</title>
-
-   <para>
-    Often, we simply want to access a valid environment that contains a
-    specific package and its dependencies. We can accomplish that with the
-    <literal>env</literal> attribute of a derivation. For example, let's say we
-    want to access an Erlang REPL with <literal>ibrowse</literal> loaded up. We
-    could do the following:
-   </para>
-
-<programlisting>
-      $ nix-shell -A beamPackages.ibrowse.env --run "erl"
-      Erlang/OTP 18 [erts-7.0] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]
-
-      Eshell V7.0  (abort with ^G)
-      1> m(ibrowse).
-      Module: ibrowse
-      MD5: 3b3e0137d0cbb28070146978a3392945
-      Compiled: January 10 2016, 23:34
-      Object file: /nix/store/g1rlf65rdgjs4abbyj4grp37ry7ywivj-ibrowse-4.2.2/lib/erlang/lib/ibrowse-4.2.2/ebin/ibrowse.beam
-      Compiler options:  [{outdir,"/tmp/nix-build-ibrowse-4.2.2.drv-0/hex-source-ibrowse-4.2.2/_build/default/lib/ibrowse/ebin"},
-      debug_info,debug_info,nowarn_shadow_vars,
-      warn_unused_import,warn_unused_vars,warnings_as_errors,
-      {i,"/tmp/nix-build-ibrowse-4.2.2.drv-0/hex-source-ibrowse-4.2.2/_build/default/lib/ibrowse/include"}]
-      Exports:
-      add_config/1                  send_req_direct/7
-      all_trace_off/0               set_dest/3
-      code_change/3                 set_max_attempts/3
-      get_config_value/1            set_max_pipeline_size/3
-      get_config_value/2            set_max_sessions/3
-      get_metrics/0                 show_dest_status/0
-      get_metrics/2                 show_dest_status/1
-      handle_call/3                 show_dest_status/2
-      handle_cast/2                 spawn_link_worker_process/1
-      handle_info/2                 spawn_link_worker_process/2
-      init/1                        spawn_worker_process/1
-      module_info/0                 spawn_worker_process/2
-      module_info/1                 start/0
-      rescan_config/0               start_link/0
-      rescan_config/1               stop/0
-      send_req/3                    stop_worker_process/1
-      send_req/4                    stream_close/1
-      send_req/5                    stream_next/1
-      send_req/6                    terminate/2
-      send_req_direct/4             trace_off/0
-      send_req_direct/5             trace_off/2
-      send_req_direct/6             trace_on/0
-      trace_on/2
-      ok
-      2>
-    </programlisting>
-
-   <para>
-    Notice the <literal>-A beamPackages.ibrowse.env</literal>. That is the key
-    to this functionality.
-   </para>
-  </section>
-
-  <section xml:id="creating-a-shell">
-   <title>Creating a Shell</title>
-
-   <para>
-    Getting access to an environment often isn't enough to do real development.
-    Usually, we need to create a <literal>shell.nix</literal> file and do our
-    development inside of the environment specified therein. This file looks a
-    lot like the packaging described above, except that <literal>src</literal>
-    points to the project root and we call the package directly.
-   </para>
-
-<programlisting>
-{ pkgs ? import &quot;&lt;nixpkgs&quot;&gt; {} }:
-
-with pkgs;
-
-let
-
-  f = { buildRebar3, ibrowse, jsx, erlware_commons }:
-      buildRebar3 {
-        name = "hex2nix";
-        version = "0.1.0";
-        src = ./.;
-        beamDeps = [ ibrowse jsx erlware_commons ];
-      };
-  drv = beamPackages.callPackage f {};
-
-in
-
-  drv
-    </programlisting>
-
-   <section xml:id="building-in-a-shell">
-    <title>Building in a Shell (for Mix Projects)</title>
-
-    <para>
-     We can leverage the support of the derivation, irrespective of the build
-     derivation, by calling the commands themselves.
-    </para>
-
-<programlisting>
-# =============================================================================
-# Variables
-# =============================================================================
-
-NIX_TEMPLATES := "$(CURDIR)/nix-templates"
-
-TARGET := "$(PREFIX)"
-
-PROJECT_NAME := thorndyke
-
-NIXPKGS=../nixpkgs
-NIX_PATH=nixpkgs=$(NIXPKGS)
-NIX_SHELL=nix-shell -I "$(NIX_PATH)" --pure
-# =============================================================================
-# Rules
-# =============================================================================
-.PHONY= all test clean repl shell build test analyze configure install \
-        test-nix-install publish plt analyze
-
-all: build
-
-guard-%:
-        @ if [ "${${*}}" == "" ]; then \
-                echo "Environment variable $* not set"; \
-                exit 1; \
-        fi
-
-clean:
-        rm -rf _build
-        rm -rf .cache
-
-repl:
-        $(NIX_SHELL) --run "iex -pa './_build/prod/lib/*/ebin'"
-
-shell:
-        $(NIX_SHELL)
-
-configure:
-        $(NIX_SHELL) --command 'eval "$$configurePhase"'
-
-build: configure
-        $(NIX_SHELL) --command 'eval "$$buildPhase"'
-
-install:
-        $(NIX_SHELL) --command 'eval "$$installPhase"'
-
-test:
-        $(NIX_SHELL) --command 'mix test --no-start --no-deps-check'
-
-plt:
-        $(NIX_SHELL) --run "mix dialyzer.plt --no-deps-check"
-
-analyze: build plt
-        $(NIX_SHELL) --run "mix dialyzer --no-compile"
-
-    </programlisting>
-
-    <para>
-     Using a <literal>shell.nix</literal> as described (see
-     <xref
-      linkend="creating-a-shell"/>) should just work. Aside from
-     <literal>test</literal>, <literal>plt</literal>, and
-     <literal>analyze</literal>, the Make targets work just fine for all of the
-     build derivations.
-    </para>
-   </section>
-  </section>
- </section>
-
- <section xml:id="generating-packages-from-hex-with-hex2nix">
-  <title>Generating Packages from Hex with <literal>hex2nix</literal></title>
-
-  <para>
-   Updating the <link xlink:href="https://hex.pm">Hex</link> package set
-   requires
-   <link
-    xlink:href="https://github.com/erlang-nix/hex2nix">hex2nix</link>.
-   Given the path to the Erlang modules (usually
-   <literal>pkgs/development/erlang-modules</literal>), it will dump a file
-   called <literal>hex-packages.nix</literal>, containing all the packages that
-   use a recognized build system in
-   <link
-    xlink:href="https://hex.pm">Hex</link>. It can't be determined,
-   however, whether every package is buildable.
-  </para>
-
-  <para>
-   To make life easier for our users, try to build every
-   <link
-      xlink:href="https://hex.pm">Hex</link> package and remove those
-   that fail. To do that, simply run the following command in the root of your
-   <literal>nixpkgs</literal> repository:
-  </para>
-
-<programlisting>
-$ nix-build -A beamPackages
-    </programlisting>
-
-  <para>
-   That will attempt to build every package in <literal>beamPackages</literal>.
-   Then manually remove those that fail. Hopefully, someone will improve
-   <link
-      xlink:href="https://github.com/erlang-nix/hex2nix">hex2nix</link>
-   in the future to automate the process.
-  </para>
- </section>
-</section>
--- a/doc/languages-frameworks/bower.xml
+++ b/doc/languages-frameworks/bower.xml
@@ -1,229 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-bower">
- <title>Bower</title>
-
- <para>
-  <link xlink:href="http://bower.io">Bower</link> is a package manager for web
-  site front-end components. Bower packages (comprising of build artefacts and
-  sometimes sources) are stored in <command>git</command> repositories,
-  typically on Github. The package registry is run by the Bower team with
-  package metadata coming from the <filename>bower.json</filename> file within
-  each package.
- </para>
-
- <para>
-  The end result of running Bower is a <filename>bower_components</filename>
-  directory which can be included in the web app's build process.
- </para>
-
- <para>
-  Bower can be run interactively, by installing
-  <varname>nodePackages.bower</varname>. More interestingly, the Bower
-  components can be declared in a Nix derivation, with the help of
-  <varname>nodePackages.bower2nix</varname>.
- </para>
-
- <section xml:id="ssec-bower2nix-usage">
-  <title><command>bower2nix</command> usage</title>
-
-  <para>
-   Suppose you have a <filename>bower.json</filename> with the following
-   contents:
-   <example xml:id="ex-bowerJson">
-    <title><filename>bower.json</filename></title>
-<programlisting language="json">
-<![CDATA[{
-  "name": "my-web-app",
-  "dependencies": {
-    "angular": "~1.5.0",
-    "bootstrap": "~3.3.6"
-  }
-}]]>
-</programlisting>
-   </example>
-  </para>
-
-  <para>
-   Running <command>bower2nix</command> will produce something like the
-   following output:
-<programlisting language="nix">
-<![CDATA[{ fetchbower, buildEnv }:
-buildEnv { name = "bower-env"; ignoreCollisions = true; paths = [
-  (fetchbower "angular" "1.5.3" "~1.5.0" "1749xb0firxdra4rzadm4q9x90v6pzkbd7xmcyjk6qfza09ykk9y")
-  (fetchbower "bootstrap" "3.3.6" "~3.3.6" "1vvqlpbfcy0k5pncfjaiskj3y6scwifxygfqnw393sjfxiviwmbv")
-  (fetchbower "jquery" "2.2.2" "1.9.1 - 2" "10sp5h98sqwk90y4k6hbdviwqzvzwqf47r3r51pakch5ii2y7js1")
-]; }]]>
-</programlisting>
-  </para>
-
-  <para>
-   Using the <command>bower2nix</command> command line arguments, the output
-   can be redirected to a file. A name like
-   <filename>bower-packages.nix</filename> would be fine.
-  </para>
-
-  <para>
-   The resulting derivation is a union of all the downloaded Bower packages
-   (and their dependencies). To use it, they still need to be linked together
-   by Bower, which is where <varname>buildBowerComponents</varname> is useful.
-  </para>
- </section>
-
- <section xml:id="ssec-build-bower-components">
-  <title><varname>buildBowerComponents</varname> function</title>
-
-  <para>
-   The function is implemented in
-   <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/bower-modules/generic/default.nix">
-   <filename>pkgs/development/bower-modules/generic/default.nix</filename></link>.
-   Example usage:
-   <example xml:id="ex-buildBowerComponents">
-    <title>buildBowerComponents</title>
-<programlisting language="nix">
-bowerComponents = buildBowerComponents {
-  name = "my-web-app";
-  generated = ./bower-packages.nix; <co xml:id="ex-buildBowerComponents-1" />
-  src = myWebApp; <co xml:id="ex-buildBowerComponents-2" />
-};
-</programlisting>
-   </example>
-  </para>
-
-  <para>
-   In <xref linkend="ex-buildBowerComponents" />, the following arguments are
-   of special significance to the function:
-   <calloutlist>
-    <callout arearefs="ex-buildBowerComponents-1">
-     <para>
-      <varname>generated</varname> specifies the file which was created by
-      <command>bower2nix</command>.
-     </para>
-    </callout>
-    <callout arearefs="ex-buildBowerComponents-2">
-     <para>
-      <varname>src</varname> is your project's sources. It needs to contain a
-      <filename>bower.json</filename> file.
-     </para>
-    </callout>
-   </calloutlist>
-  </para>
-
-  <para>
-   <varname>buildBowerComponents</varname> will run Bower to link together the
-   output of <command>bower2nix</command>, resulting in a
-   <filename>bower_components</filename> directory which can be used.
-  </para>
-
-  <para>
-   Here is an example of a web frontend build process using
-   <command>gulp</command>. You might use <command>grunt</command>, or anything
-   else.
-  </para>
-
-  <example xml:id="ex-bowerGulpFile">
-   <title>Example build script (<filename>gulpfile.js</filename>)</title>
-<programlisting language="javascript">
-<![CDATA[var gulp = require('gulp');
-
-gulp.task('default', [], function () {
-  gulp.start('build');
-});
-
-gulp.task('build', [], function () {
-  console.log("Just a dummy gulp build");
-  gulp
-    .src(["./bower_components/**/*"])
-    .pipe(gulp.dest("./gulpdist/"));
-});]]>
-</programlisting>
-  </example>
-
-  <example xml:id="ex-buildBowerComponentsDefaultNix">
-   <title>Full example — <filename>default.nix</filename></title>
-<programlisting language="nix">
-{ myWebApp ? { outPath = ./.; name = "myWebApp"; }
-, pkgs ? import &lt;nixpkgs&gt; {}
-}:
-
-pkgs.stdenv.mkDerivation {
-  name = "my-web-app-frontend";
-  src = myWebApp;
-
-  buildInputs = [ pkgs.nodePackages.gulp ];
-
-  bowerComponents = pkgs.buildBowerComponents { <co xml:id="ex-buildBowerComponentsDefault-1" />
-    name = "my-web-app";
-    generated = ./bower-packages.nix;
-    src = myWebApp;
-  };
-
-  buildPhase = ''
-    cp --reflink=auto --no-preserve=mode -R $bowerComponents/bower_components . <co xml:id="ex-buildBowerComponentsDefault-2" />
-    export HOME=$PWD <co xml:id="ex-buildBowerComponentsDefault-3" />
-    ${pkgs.nodePackages.gulp}/bin/gulp build <co xml:id="ex-buildBowerComponentsDefault-4" />
-  '';
-
-  installPhase = "mv gulpdist $out";
-}
-</programlisting>
-  </example>
-
-  <para>
-   A few notes about <xref linkend="ex-buildBowerComponentsDefaultNix" />:
-   <calloutlist>
-    <callout arearefs="ex-buildBowerComponentsDefault-1">
-     <para>
-      The result of <varname>buildBowerComponents</varname> is an input to the
-      frontend build.
-     </para>
-    </callout>
-    <callout arearefs="ex-buildBowerComponentsDefault-2">
-     <para>
-      Whether to symlink or copy the <filename>bower_components</filename>
-      directory depends on the build tool in use. In this case a copy is used
-      to avoid <command>gulp</command> silliness with permissions.
-     </para>
-    </callout>
-    <callout arearefs="ex-buildBowerComponentsDefault-3">
-     <para>
-      <command>gulp</command> requires <varname>HOME</varname> to refer to a
-      writeable directory.
-     </para>
-    </callout>
-    <callout arearefs="ex-buildBowerComponentsDefault-4">
-     <para>
-      The actual build command. Other tools could be used.
-     </para>
-    </callout>
-   </calloutlist>
-  </para>
- </section>
-
- <section xml:id="ssec-bower2nix-troubleshooting">
-  <title>Troubleshooting</title>
-
-  <variablelist>
-   <varlistentry>
-    <term>
-     <literal>ENOCACHE</literal> errors from <varname>buildBowerComponents</varname>
-    </term>
-    <listitem>
-     <para>
-      This means that Bower was looking for a package version which doesn't
-      exist in the generated <filename>bower-packages.nix</filename>.
-     </para>
-     <para>
-      If <filename>bower.json</filename> has been updated, then run
-      <command>bower2nix</command> again.
-     </para>
-     <para>
-      It could also be a bug in <command>bower2nix</command> or
-      <command>fetchbower</command>. If possible, try reformulating the version
-      specification in <filename>bower.json</filename>.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
- </section>
-</section>
--- a/doc/languages-frameworks/coq.xml
+++ b/doc/languages-frameworks/coq.xml
@@ -1,65 +1,41 @@
 <section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="sec-language-coq">
- <title>Coq</title>

- <para>
-  Coq libraries should be installed in
-  <literal>$(out)/lib/coq/${coq.coq-version}/user-contrib/</literal>. Such
-  directories are automatically added to the <literal>$COQPATH</literal>
-  environment variable by the hook defined in the Coq derivation.
- </para>
-
- <para>
-  Some libraries require OCaml and sometimes also Camlp5 or findlib. The exact
-  versions that were used to build Coq are saved in the
-  <literal>coq.ocaml</literal> and <literal>coq.camlp5</literal> and
-  <literal>coq.findlib</literal> attributes.
- </para>
-
- <para>
-  Coq libraries may be compatible with some specific versions of Coq only. The
-  <literal>compatibleCoqVersions</literal> attribute is used to precisely
-  select those versions of Coq that are compatible with this derivation.
- </para>
-
- <para>
-  Here is a simple package example. It is a pure Coq library, thus it depends
-  on Coq. It builds on the Mathematical Components library, thus it also takes
-  <literal>mathcomp</literal> as <literal>buildInputs</literal>. Its
-  <literal>Makefile</literal> has been generated using
-  <literal>coq_makefile</literal> so we only have to set the
-  <literal>$COQLIB</literal> variable at install time.
- </para>
-
-<programlisting>
-{ stdenv, fetchFromGitHub, coq, mathcomp }:
-
-stdenv.mkDerivation rec {
-  name = "coq${coq.coq-version}-multinomials-${version}";
-  version = "1.0";
-  src = fetchFromGitHub {
-    owner = "math-comp";
-    repo = "multinomials";
-    rev = version;
-    sha256 = "1qmbxp1h81cy3imh627pznmng0kvv37k4hrwi2faa101s6bcx55m";
+<title>Coq</title>
+  <para>
+    Coq libraries should be installed in
+    <literal>$(out)/lib/coq/${coq.coq-version}/user-contrib/</literal>.
+    Such directories are automatically added to the
+    <literal>$COQPATH</literal> environment variable by the hook defined
+    in the Coq derivation.
+  </para>
+  <para>
+    Some libraries require OCaml and sometimes also Camlp5. The exact
+    versions that were used to build Coq are saved in the
+    <literal>coq.ocaml</literal> and <literal>coq.camlp5</literal>
+    attributes.
+  </para>
+  <para>
+    Here is a simple package example. It is a pure Coq library, thus it
+    only depends on Coq. Its <literal>makefile</literal> has been
+    generated using <literal>coq_makefile</literal> so we only have to
+    set the <literal>$COQLIB</literal> variable at install time.
+  </para>
+  <programlisting>
+{stdenv, fetchurl, coq}:
+stdenv.mkDerivation {
+  src = fetchurl {
+    url = http://coq.inria.fr/pylons/contribs/files/Karatsuba/v8.4/Karatsuba.tar.gz;
+    sha256 = "0ymfpv4v49k4fm63nq6gcl1hbnnxrvjjp7yzc4973n49b853c5b1";
  };

+  name = "coq-karatsuba";
+
  buildInputs = [ coq ];
-  propagatedBuildInputs = [ mathcomp ];

  installFlags = "COQLIB=$(out)/lib/coq/${coq.coq-version}/";
-
-  meta = {
-    description = "A Coq/SSReflect Library for Monoidal Rings and Multinomials";
-    inherit (src.meta) homepage;
-    license = stdenv.lib.licenses.cecill-b;
-    inherit (coq.meta) platforms;
-  };
-
-  passthru = {
-    compatibleCoqVersions = v: builtins.elem v [ "8.5" "8.6" "8.7" ];
-  };
 }
 </programlisting>
 </section>
+
--- a/doc/languages-frameworks/emscripten.section.md
+++ b/doc/languages-frameworks/emscripten.section.md
@@ -1,185 +0,0 @@
-# User's Guide to Emscripten in Nixpkgs
-
-[Emscripten](https://github.com/kripken/emscripten): An LLVM-to-JavaScript Compiler
-
-This section of the manual covers how to use `emscripten` in nixpkgs.
-
-Minimal requirements:
-
-* nix
-* nixpkgs
-
-Modes of use of `emscripten`:
-
-* **Imperative usage** (on the command line):
-
-   If you want to work with `emcc`, `emconfigure` and `emmake` as you are used to from Ubuntu and similar distributions you can use these commands:
-
-    * `nix-env -i emscripten`
-    * `nix-shell -p emscripten`
-
-* **Declarative usage**:
-
-    This mode is far more power full since this makes use of `nix` for dependency management of emscripten libraries and targets by using the `mkDerivation` which is implemented by `pkgs.emscriptenStdenv` and `pkgs.buildEmscriptenPackage`. The source for the packages is in `pkgs/top-level/emscripten-packages.nix` and the abstraction behind it in `pkgs/development/em-modules/generic/default.nix`.
-    * build and install all packages: 
-        * `nix-env -iA emscriptenPackages` 
-          
-    * dev-shell for zlib implementation hacking: 
-        * `nix-shell -A emscriptenPackages.zlib` 
-
-
-## Imperative usage
-
-A few things to note:
-
-* `export EMCC_DEBUG=2` is nice for debugging
-* `~/.emscripten`, the build artifact cache sometimes creates issues and needs to be removed from time to time
-
-
-## Declarative usage
-
-Let's see two different examples from `pkgs/top-level/emscripten-packages.nix`:
-
-* `pkgs.zlib.override`
-* `pkgs.buildEmscriptenPackage`
-
-Both are interesting concepts.
-
-A special requirement of the `pkgs.buildEmscriptenPackage` is the `doCheck = true` is a default meaning that each emscriptenPackage requires a `checkPhase` implemented.
-
-* Use `export EMCC_DEBUG=2` from within a emscriptenPackage's `phase` to get more detailed debug output what is going wrong.
-* ~/.emscripten cache is requiring us to set `HOME=$TMPDIR` in individual phases. This makes compilation slower but also makes it more deterministic.
-
-### Usage 1: pkgs.zlib.override
-
-This example uses `zlib` from nixpkgs but instead of compiling **C** to **ELF** it compiles **C** to **JS** since we were using `pkgs.zlib.override` and changed stdenv to `pkgs.emscriptenStdenv`. A few adaptions and hacks were set in place to make it working. One advantage is that when `pkgs.zlib` is updated, it will automatically update this package as well. However, this can also be the downside...
-
-See the `zlib` example:
-
-    zlib = (pkgs.zlib.override {
-      stdenv = pkgs.emscriptenStdenv;
-    }).overrideDerivation
-    (old: rec {
-      buildInputs = old.buildInputs ++ [ pkgconfig ];
-      # we need to reset this setting!
-      NIX_CFLAGS_COMPILE="";
-      configurePhase = ''
-        # FIXME: Some tests require writing at $HOME
-        HOME=$TMPDIR
-        runHook preConfigure
-
-        #export EMCC_DEBUG=2
-        emconfigure ./configure --prefix=$out --shared
-
-        runHook postConfigure
-      '';
-      dontStrip = true;
-      outputs = [ "out" ];
-      buildPhase = ''
-        emmake make
-      '';
-      installPhase = ''
-        emmake make install
-      '';
-      checkPhase = ''
-        echo "================= testing zlib using node ================="
-
-        echo "Compiling a custom test"
-        set -x
-        emcc -O2 -s EMULATE_FUNCTION_POINTER_CASTS=1 test/example.c -DZ_SOLO \
-        libz.so.${old.version} -I . -o example.js
-
-        echo "Using node to execute the test"
-        ${pkgs.nodejs}/bin/node ./example.js 
-
-        set +x
-        if [ $? -ne 0 ]; then
-          echo "test failed for some reason"
-          exit 1;
-        else
-          echo "it seems to work! very good."
-        fi
-        echo "================= /testing zlib using node ================="
-      '';
-
-      postPatch = pkgs.stdenv.lib.optionalString pkgs.stdenv.isDarwin ''
-        substituteInPlace configure \
-          --replace '/usr/bin/libtool' 'ar' \
-          --replace 'AR="libtool"' 'AR="ar"' \
-          --replace 'ARFLAGS="-o"' 'ARFLAGS="-r"'
-      '';
-    });
-
-### Usage 2: pkgs.buildEmscriptenPackage
-
-This `xmlmirror` example features a emscriptenPackage which is defined completely from this context and no `pkgs.zlib.override` is used. 
-
-    xmlmirror = pkgs.buildEmscriptenPackage rec {
-      name = "xmlmirror";
-
-      buildInputs = [ pkgconfig autoconf automake libtool gnumake libxml2 nodejs openjdk json_c ];
-      nativeBuildInputs = [ pkgconfig zlib ];
-
-      src = pkgs.fetchgit {
-        url = "https://gitlab.com/odfplugfest/xmlmirror.git";
-        rev = "4fd7e86f7c9526b8f4c1733e5c8b45175860a8fd";
-        sha256 = "1jasdqnbdnb83wbcnyrp32f36w3xwhwp0wq8lwwmhqagxrij1r4b";
-      };
-
-      configurePhase = ''
-        rm -f fastXmlLint.js*
-        # a fix for ERROR:root:For asm.js, TOTAL_MEMORY must be a multiple of 16MB, was 234217728
-        # https://gitlab.com/odfplugfest/xmlmirror/issues/8
-        sed -e "s/TOTAL_MEMORY=234217728/TOTAL_MEMORY=268435456/g" -i Makefile.emEnv
-        # https://github.com/kripken/emscripten/issues/6344
-        # https://gitlab.com/odfplugfest/xmlmirror/issues/9
-        sed -e "s/\$(JSONC_LDFLAGS) \$(ZLIB_LDFLAGS) \$(LIBXML20_LDFLAGS)/\$(JSONC_LDFLAGS) \$(LIBXML20_LDFLAGS) \$(ZLIB_LDFLAGS) /g" -i Makefile.emEnv
-        # https://gitlab.com/odfplugfest/xmlmirror/issues/11
-        sed -e "s/-o fastXmlLint.js/-s EXTRA_EXPORTED_RUNTIME_METHODS='[\"ccall\", \"cwrap\"]' -o fastXmlLint.js/g" -i Makefile.emEnv
-      '';
-
-      buildPhase = ''
-        HOME=$TMPDIR
-        make -f Makefile.emEnv
-      '';
-
-      outputs = [ "out" "doc" ];
-
-      installPhase = ''
-        mkdir -p $out/share
-        mkdir -p $doc/share/${name}
-
-        cp Demo* $out/share
-        cp -R codemirror-5.12 $out/share
-        cp fastXmlLint.js* $out/share
-        cp *.xsd $out/share
-        cp *.js $out/share
-        cp *.xhtml $out/share
-        cp *.html $out/share
-        cp *.json $out/share
-        cp *.rng $out/share
-        cp README.md $doc/share/${name}
-      '';
-      checkPhase = ''
-
-      '';
-    }; 
-
-### Declarative debugging
-
-Use `nix-shell -I nixpkgs=/some/dir/nixpkgs -A emscriptenPackages.libz` and from there you can go trough the individual steps. This makes it easy to build a good `unit test` or list the files of the project.
-
-1. `nix-shell -I nixpkgs=/some/dir/nixpkgs -A emscriptenPackages.libz`
-2. `cd /tmp/`
-3. `unpackPhase`
-4. cd libz-1.2.3
-5. `configurePhase`
-6. `buildPhase`
-7. ... happy hacking...
-
-## Summary
-
-Using this toolchain makes it easy to leverage `nix` from NixOS, MacOSX or even Windows (WSL+ubuntu+nix). This toolchain is reproducible, behaves like the rest of the packages from nixpkgs and contains a set of well working examples to learn and adapt from.
-
-If in trouble, ask the maintainers.
-
--- a/doc/languages-frameworks/go.xml
+++ b/doc/languages-frameworks/go.xml
@@ -1,160 +1,124 @@
 <section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="sec-language-go">
- <title>Go</title>

- <para>
-  The function <varname>buildGoPackage</varname> builds standard Go programs.
- </para>
+<title>Go</title>

- <example xml:id='ex-buildGoPackage'>
-  <title>buildGoPackage</title>
+<para>The function <varname>buildGoPackage</varname> builds
+standard Go packages.
+</para>
+
+<example xml:id='ex-buildGoPackage'><title>buildGoPackage</title>
 <programlisting>
-deis = buildGoPackage rec {
-  name = "deis-${version}";
-  version = "1.13.0";
-
-  goPackagePath = "github.com/deis/deis"; <co xml:id='ex-buildGoPackage-1' />
-  subPackages = [ "client" ]; <co xml:id='ex-buildGoPackage-2' />
-
+net = buildGoPackage rec {
+  name = "go.net-${rev}";
+  goPackagePath = "golang.org/x/net"; <co xml:id='ex-buildGoPackage-1' />
+  subPackages = [ "ipv4" "ipv6" ]; <co xml:id='ex-buildGoPackage-2' />
+  rev = "e0403b4e005";
  src = fetchFromGitHub {
-    owner = "deis";
-    repo = "deis";
-    rev = "v${version}";
-    sha256 = "1qv9lxqx7m18029lj8cw3k7jngvxs4iciwrypdy0gd2nnghc68sw";
+    inherit rev;
+    owner = "golang";
+    repo = "net";
+    sha256 = "1g7cjzw4g4301a3yqpbk8n1d4s97sfby2aysl275x04g0zh8jxqp";
  };
-
-  goDeps = ./deps.nix; <co xml:id='ex-buildGoPackage-3' />
-
-  buildFlags = "--tags release"; <co xml:id='ex-buildGoPackage-4' />
-}
+  goPackageAliases = [ "code.google.com/p/go.net" ]; <co xml:id='ex-buildGoPackage-3' />
+  propagatedBuildInputs = [ goPackages.text ]; <co xml:id='ex-buildGoPackage-4' />
+  buildFlags = "--tags release"; <co xml:id='ex-buildGoPackage-5' />
+  disabled = isGo13;<co xml:id='ex-buildGoPackage-6' />
+};
 </programlisting>
- </example>
+</example>

- <para>
-  <xref linkend='ex-buildGoPackage'/> is an example expression using
-  buildGoPackage, the following arguments are of special significance to the
-  function:
-  <calloutlist>
-   <callout arearefs='ex-buildGoPackage-1'>
-    <para>
-     <varname>goPackagePath</varname> specifies the package's canonical Go
-     import path.
-    </para>
-   </callout>
-   <callout arearefs='ex-buildGoPackage-2'>
-    <para>
-     <varname>subPackages</varname> limits the builder from building child
-     packages that have not been listed. If <varname>subPackages</varname> is
-     not specified, all child packages will be built.
-    </para>
-    <para>
-     In this example only <literal>github.com/deis/deis/client</literal> will
-     be built.
-    </para>
-   </callout>
-   <callout arearefs='ex-buildGoPackage-3'>
-    <para>
-     <varname>goDeps</varname> is where the Go dependencies of a Go program are
-     listed as a list of package source identified by Go import path. It could
-     be imported as a separate <varname>deps.nix</varname> file for
-     readability. The dependency data structure is described below.
-    </para>
-   </callout>
-   <callout arearefs='ex-buildGoPackage-4'>
-    <para>
-     <varname>buildFlags</varname> is a list of flags passed to the go build
-     command.
-    </para>
-   </callout>
-  </calloutlist>
- </para>
+<para><xref linkend='ex-buildGoPackage'/> is an example expression using buildGoPackage,
+the following arguments are of special significance to the function:

- <para>
-  The <varname>goDeps</varname> attribute can be imported from a separate
-  <varname>nix</varname> file that defines which Go libraries are needed and
-  should be included in <varname>GOPATH</varname> for
-  <varname>buildPhase</varname>.
- </para>
+<calloutlist>

- <example xml:id='ex-goDeps'>
-  <title>deps.nix</title>
-<programlisting>
-[ <co xml:id='ex-goDeps-1' />
-  {
-    goPackagePath = "gopkg.in/yaml.v2"; <co xml:id='ex-goDeps-2' />
-    fetch = {
-      type = "git"; <co xml:id='ex-goDeps-3' />
-      url = "https://gopkg.in/yaml.v2";
-      rev = "a83829b6f1293c91addabc89d0571c246397bbf4";
-      sha256 = "1m4dsmk90sbi17571h6pld44zxz7jc4lrnl4f27dpd1l8g5xvjhh";
-    };
-  }
-  {
-    goPackagePath = "github.com/docopt/docopt-go";
-    fetch = {
-      type = "git";
-      url = "https://github.com/docopt/docopt-go";
-      rev = "784ddc588536785e7299f7272f39101f7faccc3f";
-      sha256 = "0wwz48jl9fvl1iknvn9dqr4gfy1qs03gxaikrxxp9gry6773v3sj";
-    };
-  }
-]
-</programlisting>
- </example>
-
- <para>
-  <calloutlist>
-   <callout arearefs='ex-goDeps-1'>
+  <callout arearefs='ex-buildGoPackage-1'>
    <para>
-     <varname>goDeps</varname> is a list of Go dependencies.
+      <varname>goPackagePath</varname> specifies the package's canonical Go import path.
    </para>
-   </callout>
-   <callout arearefs='ex-goDeps-2'>
-    <para>
-     <varname>goPackagePath</varname> specifies Go package import path.
-    </para>
-   </callout>
-   <callout arearefs='ex-goDeps-3'>
-    <para>
-     <varname>fetch type</varname> that needs to be used to get package source.
-     If <varname>git</varname> is used there should be <varname>url</varname>,
-     <varname>rev</varname> and <varname>sha256</varname> defined next to it.
-    </para>
-   </callout>
-  </calloutlist>
- </para>
+  </callout>

- <para>
-  To extract dependency information from a Go package in automated way use
-  <link xlink:href="https://github.com/kamilchm/go2nix">go2nix</link>. It can
-  produce complete derivation and <varname>goDeps</varname> file for Go
-  programs.
- </para>
+  <callout arearefs='ex-buildGoPackage-2'>
+    <para>
+      <varname>subPackages</varname> limits the builder from building child packages that
+      have not been listed. If <varname>subPackages</varname> is not specified, all child
+      packages will be built.
+    </para>
+    <para>
+      In this example only <literal>code.google.com/p/go.net/ipv4</literal> and
+      <literal>code.google.com/p/go.net/ipv6</literal> will be built.
+    </para>
+  </callout>
+
+  <callout arearefs='ex-buildGoPackage-3'>
+    <para>
+      <varname>goPackageAliases</varname> is a list of alternative import paths
+      that are valid for this library.
+      Packages that depend on this library will automatically rename
+      import paths that match any of the aliases to <literal>goPackagePath</literal>.
+    </para>
+    <para>
+      In this example imports will be renamed from
+      <literal>code.google.com/p/go.net</literal> to
+      <literal>golang.org/x/net</literal> in every package that depend on the
+      <literal>go.net</literal> library.
+    </para>
+  </callout>
+
+  <callout arearefs='ex-buildGoPackage-4'>
+    <para>
+      <varname>propagatedBuildInputs</varname> is where the dependencies of a Go library are
+      listed. Only libraries should list <varname>propagatedBuildInputs</varname>. If a standalone
+      program is being built instead, use <varname>buildInputs</varname>. If a library's tests require
+      additional dependencies that are not propagated, they should be listed in <varname>buildInputs</varname>.
+    </para>
+  </callout>
+
+  <callout arearefs='ex-buildGoPackage-5'>
+    <para>
+      <varname>buildFlags</varname> is a list of flags passed to the go build command.
+    </para>
+  </callout>
+
+  <callout arearefs='ex-buildGoPackage-6'>
+    <para>
+      If <varname>disabled</varname> is <literal>true</literal>,
+      nix will refuse to build this package.
+    </para>
+    <para>
+      In this example the package will not be built for go 1.3. The <literal>isGo13</literal>
+      is an utility function that returns <literal>true</literal> if go used to build the
+      package has version 1.3.x.
+    </para>
+  </callout>
+
+</calloutlist>
+
+</para>
+
+<para>
+Reusable Go libraries may be found in the <varname>goPackages</varname> set. You can test
+build a Go package as follows:

- <para>
-  <varname>buildGoPackage</varname> produces
-  <xref linkend='chap-multiple-output' xrefstyle="select: title" /> where
-  <varname>bin</varname> includes program binaries. You can test build a Go
-  binary as follows:
 <screen>
-    $ nix-build -A deis.bin
-  </screen>
-  or build all outputs with:
-<screen>
-    $ nix-build -A deis.all
-  </screen>
-  <varname>bin</varname> output will be installed by default with
-  <varname>nix-env -i</varname> or <varname>systemPackages</varname>.
- </para>
+$ nix-build -A goPackages.net
+</screen>
+
+</para>
+
+<para>
+You may use Go packages installed into the active Nix profiles by adding
+the following to your ~/.bashrc:

- <para>
-  You may use Go packages installed into the active Nix profiles by adding the
-  following to your ~/.bashrc:
 <screen>
 for p in $NIX_PROFILES; do
    GOPATH="$p/share/go:$GOPATH"
 done
 </screen>
- </para>
+</para>
+
+  <para>To extract dependency information from a Go package in automated way use <link xlink:href="https://github.com/cstrahan/go2nix">go2nix</link>.</para>
 </section>
+
--- a/doc/languages-frameworks/haskell.section.md
+++ b/doc/languages-frameworks/haskell.section.md
--- a/doc/languages-frameworks/idris.section.md
+++ b/doc/languages-frameworks/idris.section.md
@@ -1,39 +0,0 @@
-Idris packages
-==============
-
-This directory contains build rules for idris packages. In addition,
-it contains several functions to build and compose those packages.
-Everything is exposed to the user via the `idrisPackages` attribute.
-
-callPackage
------------
-
-This is like the normal nixpkgs callPackage function, specialized to
-idris packages.
-
-builtins
---------
-
-This is a list of all of the libraries that come packaged with Idris
-itself.
-
-build-idris-package
--------------------
-
-A function to build an idris package. Its sole argument is a set like
-you might pass to `stdenv.mkDerivation`, except `build-idris-package`
-sets several attributes for you. See `build-idris-package.nix` for
-details.
-
-build-builtin-package
----------------------
-
-A version of `build-idris-package` specialized to builtin libraries.
-Mostly for internal use.
-
-with-packages
-------------
-
-Bundle idris together with a list of packages. Because idris currently
-only supports a single directory in its library path, you must include
-all desired libraries here, including `prelude` and `base`.
--- a/doc/languages-frameworks/index.xml
+++ b/doc/languages-frameworks/index.xml
@@ -1,31 +1,45 @@
 <chapter xmlns="http://docbook.org/ns/docbook"
         xmlns:xi="http://www.w3.org/2001/XInclude"
         xml:id="chap-language-support">
- <title>Support for specific programming languages and frameworks</title>
- <para>
-  The <link linkend="chap-stdenv">standard build environment</link> makes it
-  easy to build typical Autotools-based packages with very little code. Any
-  other kind of package can be accomodated by overriding the appropriate phases
-  of <literal>stdenv</literal>. However, there are specialised functions in
-  Nixpkgs to easily build packages for other programming languages, such as
-  Perl or Haskell. These are described in this chapter.
- </para>
- <xi:include href="beam.xml" />
- <xi:include href="bower.xml" />
- <xi:include href="coq.xml" />
- <xi:include href="go.xml" />
- <xi:include href="haskell.section.xml" />
- <xi:include href="idris.section.xml" />
- <xi:include href="java.xml" />
- <xi:include href="lua.xml" />
- <xi:include href="node.section.xml" />
- <xi:include href="perl.xml" />
- <xi:include href="python.section.xml" />
- <xi:include href="qt.xml" />
- <xi:include href="r.section.xml" />
- <xi:include href="ruby.xml" />
- <xi:include href="rust.section.xml" />
- <xi:include href="texlive.xml" />
- <xi:include href="vim.section.xml" />
- <xi:include href="emscripten.section.xml" />
+
+<title>Support for specific programming languages and frameworks</title>
+
+<para>The <link linkend="chap-stdenv">standard build
+environment</link> makes it easy to build typical Autotools-based
+packages with very little code.  Any other kind of package can be
+accomodated by overriding the appropriate phases of
+<literal>stdenv</literal>.  However, there are specialised functions
+in Nixpkgs to easily build packages for other programming languages,
+such as Perl or Haskell.  These are described in this chapter.</para>
+
+
+<xi:include href="perl.xml" />
+<xi:include href="python.xml" />
+<xi:include href="ruby.xml" />
+<xi:include href="go.xml" />
+<xi:include href="java.xml" />
+<xi:include href="lua.xml" />
+<xi:include href="coq.xml" />
+<xi:include href="idris.xml" /> <!-- generated from ../../pkgs/development/idris-modules/README.md  -->
+<xi:include href="r.xml" /> <!-- generated from ../../pkgs/development/r-modules/README.md  -->
+<xi:include href="qt.xml" />
+<xi:include href="texlive.xml" />
+
+
+<!--
+<section><title>Haskell</title>
+
+<para>TODO</para>
+
+</section>
+
+
+<section><title>TeX / LaTeX</title>
+
+<para>* Special support for building TeX documents</para>
+
+</section>
+-->
+
+
 </chapter>
--- a/doc/languages-frameworks/java.xml
+++ b/doc/languages-frameworks/java.xml
@@ -1,10 +1,11 @@
 <section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="sec-language-java">
- <title>Java</title>

- <para>
-  Ant-based Java packages are typically built from source as follows:
+<title>Java</title>
+
+<para>Ant-based Java packages are typically built from source as follows:
+
 <programlisting>
 stdenv.mkDerivation {
  name = "...";
@@ -15,36 +16,33 @@ stdenv.mkDerivation {
  buildPhase = "ant";
 }
 </programlisting>
-  Note that <varname>jdk</varname> is an alias for the OpenJDK (self-built
-  where available, or pre-built via Zulu). Platforms with OpenJDK not (yet) in
-  Nixpkgs (<literal>Aarch32</literal>, <literal>Aarch64</literal>) point to the
-  (unfree) <literal>oraclejdk</literal>.
- </para>

- <para>
-  JAR files that are intended to be used by other packages should be installed
-  in <filename>$out/share/java</filename>. JDKs have a stdenv setup hook that
-  add any JARs in the <filename>share/java</filename> directories of the build
-  inputs to the <envar>CLASSPATH</envar> environment variable. For instance, if
-  the package <literal>libfoo</literal> installs a JAR named
-  <filename>foo.jar</filename> in its <filename>share/java</filename>
-  directory, and another package declares the attribute
+Note that <varname>jdk</varname> is an alias for the OpenJDK.</para>
+
+<para>JAR files that are intended to be used by other packages should
+be installed in <filename>$out/share/java</filename>.  The OpenJDK has
+a stdenv setup hook that adds any JARs in the
+<filename>share/java</filename> directories of the build inputs to the
+<envar>CLASSPATH</envar> environment variable.  For instance, if the
+package <literal>libfoo</literal> installs a JAR named
+<filename>foo.jar</filename> in its <filename>share/java</filename>
+directory, and another package declares the attribute
+
 <programlisting>
 buildInputs = [ jdk libfoo ];
 </programlisting>
-  then <envar>CLASSPATH</envar> will be set to
-  <filename>/nix/store/...-libfoo/share/java/foo.jar</filename>.
- </para>

- <para>
-  Private JARs should be installed in a location like
-  <filename>$out/share/<replaceable>package-name</replaceable></filename>.
- </para>
+then <envar>CLASSPATH</envar> will be set to
+<filename>/nix/store/...-libfoo/share/java/foo.jar</filename>.</para>
+
+<para>Private JARs
+should be installed in a location like
+<filename>$out/share/<replaceable>package-name</replaceable></filename>.</para>
+
+<para>If your Java package provides a program, you need to generate a
+wrapper script to run it using the OpenJRE.  You can use
+<literal>makeWrapper</literal> for this:

- <para>
-  If your Java package provides a program, you need to generate a wrapper
-  script to run it using the OpenJRE. You can use
-  <literal>makeWrapper</literal> for this:
 <programlisting>
 buildInputs = [ makeWrapper ];

@@ -55,30 +53,32 @@ installPhase =
      --add-flags "-cp $out/share/java/foo.jar org.foo.Main"
  '';
 </programlisting>
-  Note the use of <literal>jre</literal>, which is the part of the OpenJDK
-  package that contains the Java Runtime Environment. By using
-  <literal>${jre}/bin/java</literal> instead of
-  <literal>${jdk}/bin/java</literal>, you prevent your package from depending
-  on the JDK at runtime.
- </para>

- <para>
-  Note all JDKs passthru <literal>home</literal>, so if your application
-  requires environment variables like <envar>JAVA_HOME</envar> being set, that
-  can be done in a generic fashion with the <literal>--set</literal> argument
-  of <literal>makeWrapper</literal>:
+Note the use of <literal>jre</literal>, which is the part of the
+OpenJDK package that contains the Java Runtime Environment.  By using
+<literal>${jre}/bin/java</literal> instead of
+<literal>${jdk}/bin/java</literal>, you prevent your package from
+depending on the JDK at runtime.</para>
+
+<para>It is possible to use a different Java compiler than
+<command>javac</command> from the OpenJDK.  For instance, to use the
+Eclipse Java Compiler:
+
 <programlisting>
-  --set JAVA_HOME ${jdk.home}
+buildInputs = [ jre ant ecj ];
 </programlisting>
- </para>

- <para>
-  It is possible to use a different Java compiler than <command>javac</command>
-  from the OpenJDK. For instance, to use the GNU Java Compiler:
+(Note that here you don’t need the full JDK as an input, but just the
+JRE.)  The ECJ has a stdenv setup hook that sets some environment
+variables to cause Ant to use ECJ, but this doesn’t work with all Ant
+files.  Similarly, you can use the GNU Java Compiler:
+
 <programlisting>
 buildInputs = [ gcj ant ];
 </programlisting>
-  Here, Ant will automatically use <command>gij</command> (the GNU Java
-  Runtime) instead of the OpenJRE.
- </para>
+
+Here, Ant will automatically use <command>gij</command> (the GNU Java
+Runtime) instead of the OpenJRE.</para>
+
 </section>
+
--- a/doc/languages-frameworks/lua.xml
+++ b/doc/languages-frameworks/lua.xml
@@ -1,22 +1,24 @@
 <section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="sec-language-lua">
- <title>Lua</title>

- <para>
-  Lua packages are built by the <varname>buildLuaPackage</varname> function.
-  This function is implemented in
-  <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/lua-modules/generic/default.nix">
+<title>Lua</title>
+
+<para>
+  Lua packages are built by the <varname>buildLuaPackage</varname> function.  This function is
+  implemented
+  in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/lua-modules/generic/default.nix">
  <filename>pkgs/development/lua-modules/generic/default.nix</filename></link>
  and works similarly to <varname>buildPerlPackage</varname>. (See
  <xref linkend="sec-language-perl"/> for details.)
- </para>
+</para>

- <para>
-  Lua packages are defined in
-  <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/lua-packages.nix"><filename>pkgs/top-level/lua-packages.nix</filename></link>.
+<para>
+  Lua packages are defined
+  in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/lua-packages.nix"><filename>pkgs/top-level/lua-packages.nix</filename></link>.
  Most of them are simple. For example:
-<programlisting>
+
+  <programlisting>
 fileSystem = buildLuaPackage {
  name = "filesystem-1.6.2";
  src = fetchurl {
@@ -30,19 +32,20 @@ fileSystem = buildLuaPackage {
  };
 };
  </programlisting>
- </para>
+</para>

- <para>
+<para>
  Though, more complicated package should be placed in a seperate file in
  <link
  xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/lua-modules"><filename>pkgs/development/lua-modules</filename></link>.
- </para>
+</para>
+<para>
+  Lua packages accept additional parameter <varname>disabled</varname>, which defines
+  the condition of disabling package from luaPackages. For example, if package has
+  <varname>disabled</varname> assigned to <literal>lua.luaversion != "5.1"</literal>,
+  it will not be included in any luaPackages except lua51Packages, making it
+  only be built for lua 5.1.
+</para>

- <para>
-  Lua packages accept additional parameter <varname>disabled</varname>, which
-  defines the condition of disabling package from luaPackages. For example, if
-  package has <varname>disabled</varname> assigned to <literal>lua.luaversion
-  != "5.1"</literal>, it will not be included in any luaPackages except
-  lua51Packages, making it only be built for lua 5.1.
- </para>
 </section>
+
--- a/doc/languages-frameworks/node.section.md
+++ b/doc/languages-frameworks/node.section.md
@@ -1,51 +0,0 @@
-Node.js packages
-================
-The `pkgs/development/node-packages` folder contains a generated collection of
-[NPM packages](https://npmjs.com/) that can be installed with the Nix package
-manager.
-
-As a rule of thumb, the package set should only provide *end user* software
-packages, such as command-line utilities. Libraries should only be added to the
-package set if there is a non-NPM package that requires it.
-
-When it is desired to use NPM libraries in a development project, use the
-`node2nix` generator directly on the `package.json` configuration file of the
-project.
-
-The package set also provides support for multiple Node.js versions. The policy
-is that a new package should be added to the collection for the latest stable LTS
-release (which is currently 8.x), unless there is an explicit reason to support
-a different release.
-
-If your package uses native addons, you need to examine what kind of native
-build system it uses. Here are some examples:
-
-* `node-gyp`
-* `node-gyp-builder`
-* `node-pre-gyp`
-
-After you have identified the correct system, you need to override your package
-expression while adding in build system as a build input. For example, `dat`
-requires `node-gyp-build`, so we override its expression in `default-v8.nix`:
-
-```nix
-dat = nodePackages.dat.override (oldAttrs: {
-  buildInputs = oldAttrs.buildInputs ++ [ nodePackages.node-gyp-build ];
-});
-```
-
-To add a package from NPM to nixpkgs:
-
- 1. Modify `pkgs/development/node-packages/node-packages-v8.json` to add, update
-    or remove package entries. (Or `pkgs/development/node-packages/node-packages-v10.json`
-    for packages depending on Node.js 10.x)
- 2. Run the script: `(cd pkgs/development/node-packages && ./generate.sh)`.
- 3. Build your new package to test your changes:
-    `cd /path/to/nixpkgs && nix-build -A nodePackages.<new-or-updated-package>`.
-    To build against a specific Node.js version (e.g. 10.x):
-    `nix-build -A nodePackages_10_x.<new-or-updated-package>`
- 4. Add and commit all modified and generated files.
-
-For more information about the generation process, consult the
-[README.md](https://github.com/svanderburg/node2nix) file of the `node2nix`
-tool.
--- a/doc/languages-frameworks/perl.xml
+++ b/doc/languages-frameworks/perl.xml
@@ -1,27 +1,24 @@
 <section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="sec-language-perl">
- <title>Perl</title>

- <para>
-  Nixpkgs provides a function <varname>buildPerlPackage</varname>, a generic
-  package builder function for any Perl package that has a standard
-  <varname>Makefile.PL</varname>. It’s implemented in
-  <link
-xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/perl-modules/generic"><filename>pkgs/development/perl-modules/generic</filename></link>.
- </para>
+<title>Perl</title>

- <para>
-  Perl packages from CPAN are defined in
-  <link
+<para>Nixpkgs provides a function <varname>buildPerlPackage</varname>,
+a generic package builder function for any Perl package that has a
+standard <varname>Makefile.PL</varname>.  It’s implemented in <link
+xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/perl-modules/generic"><filename>pkgs/development/perl-modules/generic</filename></link>.</para>
+
+<para>Perl packages from CPAN are defined in <link
 xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/perl-packages.nix"><filename>pkgs/top-level/perl-packages.nix</filename></link>,
-  rather than <filename>pkgs/all-packages.nix</filename>. Most Perl packages
-  are so straight-forward to build that they are defined here directly, rather
-  than having a separate function for each package called from
-  <filename>perl-packages.nix</filename>. However, more complicated packages
-  should be put in a separate file, typically in
-  <filename>pkgs/development/perl-modules</filename>. Here is an example of the
-  former:
+rather than <filename>pkgs/all-packages.nix</filename>.  Most Perl
+packages are so straight-forward to build that they are defined here
+directly, rather than having a separate function for each package
+called from <filename>perl-packages.nix</filename>.  However, more
+complicated packages should be put in a separate file, typically in
+<filename>pkgs/development/perl-modules</filename>.  Here is an
+example of the former:
+
 <programlisting>
 ClassC3 = buildPerlPackage rec {
  name = "Class-C3-0.21";
@@ -31,72 +28,74 @@ ClassC3 = buildPerlPackage rec {
  };
 };
 </programlisting>
-  Note the use of <literal>mirror://cpan/</literal>, and the
-  <literal>${name}</literal> in the URL definition to ensure that the name
-  attribute is consistent with the source that we’re actually downloading.
-  Perl packages are made available in <filename>all-packages.nix</filename>
-  through the variable <varname>perlPackages</varname>. For instance, if you
-  have a package that needs <varname>ClassC3</varname>, you would typically
-  write
+
+Note the use of <literal>mirror://cpan/</literal>, and the
+<literal>${name}</literal> in the URL definition to ensure that the
+name attribute is consistent with the source that we’re actually
+downloading.  Perl packages are made available in
+<filename>all-packages.nix</filename> through the variable
+<varname>perlPackages</varname>.  For instance, if you have a package
+that needs <varname>ClassC3</varname>, you would typically write
+
 <programlisting>
 foo = import ../path/to/foo.nix {
  inherit stdenv fetchurl ...;
  inherit (perlPackages) ClassC3;
 };
 </programlisting>
-  in <filename>all-packages.nix</filename>. You can test building a Perl
-  package as follows:
+
+in <filename>all-packages.nix</filename>.  You can test building a
+Perl package as follows:
+
 <screen>
 $ nix-build -A perlPackages.ClassC3
 </screen>
-  <varname>buildPerlPackage</varname> adds <literal>perl-</literal> to the
-  start of the name attribute, so the package above is actually called
-  <literal>perl-Class-C3-0.21</literal>. So to install it, you can say:
+
+<varname>buildPerlPackage</varname> adds <literal>perl-</literal> to
+the start of the name attribute, so the package above is actually
+called <literal>perl-Class-C3-0.21</literal>.  So to install it, you
+can say:
+
 <screen>
 $ nix-env -i perl-Class-C3
 </screen>
-  (Of course you can also install using the attribute name: <literal>nix-env -i
-  -A perlPackages.ClassC3</literal>.)
- </para>

- <para>
-  So what does <varname>buildPerlPackage</varname> do? It does the following:
-  <orderedlist>
-   <listitem>
-    <para>
-     In the configure phase, it calls <literal>perl Makefile.PL</literal> to
-     generate a Makefile. You can set the variable
-     <varname>makeMakerFlags</varname> to pass flags to
-     <filename>Makefile.PL</filename>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It adds the contents of the <envar>PERL5LIB</envar> environment variable
-     to <literal>#! .../bin/perl</literal> line of Perl scripts as
-     <literal>-I<replaceable>dir</replaceable></literal> flags. This ensures
-     that a script can find its dependencies.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     In the fixup phase, it writes the propagated build inputs
-     (<varname>propagatedBuildInputs</varname>) to the file
-     <filename>$out/nix-support/propagated-user-env-packages</filename>.
-     <command>nix-env</command> recursively installs all packages listed in
-     this file when you install a package that has it. This ensures that a Perl
-     package can find its dependencies.
-    </para>
-   </listitem>
-  </orderedlist>
- </para>
+(Of course you can also install using the attribute name:
+<literal>nix-env -i -A perlPackages.ClassC3</literal>.)</para>
+
+<para>So what does <varname>buildPerlPackage</varname> do?  It does
+the following:
+
+<orderedlist>
+
+  <listitem><para>In the configure phase, it calls <literal>perl
+  Makefile.PL</literal> to generate a Makefile.  You can set the
+  variable <varname>makeMakerFlags</varname> to pass flags to
+  <filename>Makefile.PL</filename></para></listitem>
+
+  <listitem><para>It adds the contents of the <envar>PERL5LIB</envar>
+  environment variable to <literal>#! .../bin/perl</literal> line of
+  Perl scripts as <literal>-I<replaceable>dir</replaceable></literal>
+  flags.  This ensures that a script can find its
+  dependencies.</para></listitem>
+
+  <listitem><para>In the fixup phase, it writes the propagated build
+  inputs (<varname>propagatedBuildInputs</varname>) to the file
+  <filename>$out/nix-support/propagated-user-env-packages</filename>.
+  <command>nix-env</command> recursively installs all packages listed
+  in this file when you install a package that has it.  This ensures
+  that a Perl package can find its dependencies.</para></listitem>
+
+</orderedlist>
+
+</para>
+
+<para><varname>buildPerlPackage</varname> is built on top of
+<varname>stdenv</varname>, so everything can be customised in the
+usual way.  For instance, the <literal>BerkeleyDB</literal> module has
+a <varname>preConfigure</varname> hook to generate a configuration
+file used by <filename>Makefile.PL</filename>:

- <para>
-  <varname>buildPerlPackage</varname> is built on top of
-  <varname>stdenv</varname>, so everything can be customised in the usual way.
-  For instance, the <literal>BerkeleyDB</literal> module has a
-  <varname>preConfigure</varname> hook to generate a configuration file used by
-  <filename>Makefile.PL</filename>:
 <programlisting>
 { buildPerlPackage, fetchurl, db }:

@@ -109,20 +108,23 @@ buildPerlPackage rec {
  };

  preConfigure = ''
-    echo "LIB = ${db.out}/lib" > config.in
-    echo "INCLUDE = ${db.dev}/include" >> config.in
+    echo "LIB = ${db}/lib" > config.in
+    echo "INCLUDE = ${db}/include" >> config.in
  '';
 }
 </programlisting>
- </para>

- <para>
-  Dependencies on other Perl packages can be specified in the
-  <varname>buildInputs</varname> and <varname>propagatedBuildInputs</varname>
-  attributes. If something is exclusively a build-time dependency, use
-  <varname>buildInputs</varname>; if it’s (also) a runtime dependency, use
-  <varname>propagatedBuildInputs</varname>. For instance, this builds a Perl
-  module that has runtime dependencies on a bunch of other modules:
+</para>
+
+<para>Dependencies on other Perl packages can be specified in the
+<varname>buildInputs</varname> and
+<varname>propagatedBuildInputs</varname> attributes.  If something is
+exclusively a build-time dependency, use
+<varname>buildInputs</varname>; if it’s (also) a runtime dependency,
+use <varname>propagatedBuildInputs</varname>.  For instance, this
+builds a Perl module that has runtime dependencies on a bunch of other
+modules:
+
 <programlisting>
 ClassC3Componentised = buildPerlPackage rec {
  name = "Class-C3-Componentised-1.0004";
@@ -135,58 +137,45 @@ ClassC3Componentised = buildPerlPackage rec {
  ];
 };
 </programlisting>
- </para>

- <section xml:id="ssec-generation-from-CPAN">
-  <title>Generation from CPAN</title>
+</para>

-  <para>
-   Nix expressions for Perl packages can be generated (almost) automatically
-   from CPAN. This is done by the program
-   <command>nix-generate-from-cpan</command>, which can be installed as
-   follows:
-  </para>
+<section xml:id="ssec-generation-from-CPAN"><title>Generation from CPAN</title>
+
+<para>Nix expressions for Perl packages can be generated (almost)
+automatically from CPAN.  This is done by the program
+<command>nix-generate-from-cpan</command>, which can be installed
+as follows:</para>

 <screen>
 $ nix-env -i nix-generate-from-cpan
 </screen>

-  <para>
-   This program takes a Perl module name, looks it up on CPAN, fetches and
-   unpacks the corresponding package, and prints a Nix expression on standard
-   output. For example:
+<para>This program takes a Perl module name, looks it up on CPAN,
+fetches and unpacks the corresponding package, and prints a Nix
+expression on standard output.  For example:
+
 <screen>
 $ nix-generate-from-cpan XML::Simple
-  XMLSimple = buildPerlPackage rec {
-    name = "XML-Simple-2.22";
+  XMLSimple = buildPerlPackage {
+    name = "XML-Simple-2.20";
    src = fetchurl {
-      url = "mirror://cpan/authors/id/G/GR/GRANTM/${name}.tar.gz";
-      sha256 = "b9450ef22ea9644ae5d6ada086dc4300fa105be050a2030ebd4efd28c198eb49";
+      url = mirror://cpan/authors/id/G/GR/GRANTM/XML-Simple-2.20.tar.gz;
+      sha256 = "5cff13d0802792da1eb45895ce1be461903d98ec97c9c953bc8406af7294434a";
    };
    propagatedBuildInputs = [ XMLNamespaceSupport XMLSAX XMLSAXExpat ];
    meta = {
-      description = "An API for simple XML files";
-      license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
+      description = "Easily read/write XML (esp config files)";
+      license = "perl";
    };
  };
 </screen>
-   The output can be pasted into
-   <filename>pkgs/top-level/perl-packages.nix</filename> or wherever else you
-   need it.
-  </para>
- </section>

- <section xml:id="ssec-perl-cross-compilation">
-  <title>Cross-compiling modules</title>
+The output can be pasted into
+<filename>pkgs/top-level/perl-packages.nix</filename> or wherever else
+you need it.</para>

-  <para>
-   Nixpkgs has experimental support for cross-compiling Perl modules. In many
-   cases, it will just work out of the box, even for modules with native
-   extensions. Sometimes, however, the Makefile.PL for a module may
-   (indirectly) import a native module. In that case, you will need to make a
-   stub for that module that will satisfy the Makefile.PL and install it into
-   <filename>lib/perl5/site_perl/cross_perl/${perl.version}</filename>. See the
-   <varname>postInstall</varname> for <varname>DBI</varname> for an example.
-  </para>
- </section>
 </section>
+
+</section>
+
--- a/doc/languages-frameworks/python.section.md
+++ b/doc/languages-frameworks/python.section.md
--- a/doc/languages-frameworks/python.xml
+++ b/doc/languages-frameworks/python.xml
@@ -0,0 +1,447 @@
+<section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xml:id="sec-python">
+
+<title>Python</title>
+
+<para>
+  Currently supported interpreters are <varname>python26</varname>, <varname>python27</varname>,
+  <varname>python33</varname>, <varname>python34</varname>, <varname>python35</varname>
+  and <varname>pypy</varname>.
+</para>
+
+<para>
+  <varname>python</varname> is an alias to <varname>python27</varname> and <varname>python3</varname> is an alias to <varname>python34</varname>.
+</para>
+
+<para>
+  <varname>python26</varname> and <varname>python27</varname> do not include modules that require
+  external dependencies (to reduce dependency bloat). Following modules need to be added as
+  <varname>buildInput</varname> explicitly:
+</para>
+
+<itemizedlist>
+  <listitem><para><varname>python.modules.bsddb</varname></para></listitem>
+  <listitem><para><varname>python.modules.curses</varname></para></listitem>
+  <listitem><para><varname>python.modules.curses_panel</varname></para></listitem>
+  <listitem><para><varname>python.modules.crypt</varname></para></listitem>
+  <listitem><para><varname>python.modules.gdbm</varname></para></listitem>
+  <listitem><para><varname>python.modules.sqlite3</varname></para></listitem>
+  <listitem><para><varname>python.modules.tkinter</varname></para></listitem>
+  <listitem><para><varname>python.modules.readline</varname></para></listitem>
+</itemizedlist>
+
+<para>For convenience <varname>python27Full</varname> and <varname>python26Full</varname>
+are provided with all modules included.</para>
+
+<para>
+  Python packages that
+  use <link xlink:href="http://pypi.python.org/pypi/setuptools/"><literal>setuptools</literal></link> or <literal>distutils</literal>,
+  can be built using the <varname>buildPythonPackage</varname> function as documented below.
+</para>
+
+<para>
+ All packages depending on any Python interpreter get appended <varname>$out/${python.sitePackages}</varname>
+ to <literal>$PYTHONPATH</literal> if such directory exists.
+</para>
+
+<variablelist>
+  <title>
+     Useful attributes on interpreters packages:
+  </title>
+
+  <varlistentry>
+    <term><varname>libPrefix</varname></term>
+    <listitem><para>
+        Name of the folder in <literal>${python}/lib/</literal> for corresponding interpreter.
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>interpreter</varname></term>
+    <listitem><para>
+        Alias for <literal>${python}/bin/${executable}.</literal>
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>buildEnv</varname></term>
+    <listitem><para>
+        Function to build python interpreter environments with extra packages bundled together.
+        See <xref linkend="ssec-python-build-env" /> for usage and documentation.
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>sitePackages</varname></term>
+    <listitem><para>
+      Alias for <literal>lib/${libPrefix}/site-packages</literal>.
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>executable</varname></term>
+    <listitem><para>
+      Name of the interpreter executable, ie <literal>python3.4</literal>.
+    </para></listitem>
+  </varlistentry>
+
+</variablelist>
+<section xml:id="ssec-build-python-package"><title><varname>buildPythonPackage</varname> function</title>
+
+  <para>
+  The function is implemented in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/python-modules/generic/default.nix">
+  <filename>pkgs/development/python-modules/generic/default.nix</filename></link>.
+  Example usage:
+
+<programlisting language="nix">
+twisted = buildPythonPackage {
+  name = "twisted-8.1.0";
+
+  src = pkgs.fetchurl {
+    url = http://tmrc.mit.edu/mirror/twisted/Twisted/8.1/Twisted-8.1.0.tar.bz2;
+    sha256 = "0q25zbr4xzknaghha72mq57kh53qw1bf8csgp63pm9sfi72qhirl";
+  };
+
+  propagatedBuildInputs = [ self.ZopeInterface ];
+
+  meta = {
+    homepage = http://twistedmatrix.com/;
+    description = "Twisted, an event-driven networking engine written in Python";
+    license = stdenv.lib.licenses.mit;
+  };
+};
+</programlisting>
+
+  Most of Python packages that use <varname>buildPythonPackage</varname> are defined
+  in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/python-packages.nix"><filename>pkgs/top-level/python-packages.nix</filename></link>
+  and generated for each python interpreter separately into attribute sets <varname>python26Packages</varname>,
+  <varname>python27Packages</varname>, <varname>python35Packages</varname>, <varname>python33Packages</varname>,
+  <varname>python34Packages</varname> and <varname>pypyPackages</varname>.
+  </para>
+
+  <para>
+    <function>buildPythonPackage</function> mainly does four things:
+
+    <orderedlist>
+      <listitem><para>
+        In the <varname>buildPhase</varname>, it calls
+        <literal>${python.interpreter} setup.py bdist_wheel</literal> to build a wheel binary zipfile.
+      </para></listitem>
+
+      <listitem><para>
+        In the <varname>installPhase</varname>, it installs the wheel file using
+        <literal>pip install *.whl</literal>.
+      </para></listitem>
+
+      <listitem><para>
+        In the <varname>postFixup</varname> phase, <literal>wrapPythonPrograms</literal>
+        bash function is called to wrap all programs in <filename>$out/bin/*</filename>
+        directory to include <literal>$PYTHONPATH</literal> and <literal>$PATH</literal>
+        environment variables.
+      </para></listitem>
+
+      <listitem><para>
+        In the <varname>installCheck</varname> phase, <literal>${python.interpreter} setup.py test</literal>
+        is ran.
+      </para></listitem>
+    </orderedlist>
+  </para>
+
+  <para>By default <varname>doCheck = true</varname> is set</para>
+
+  <para>
+    As in Perl, dependencies on other Python packages can be specified in the
+    <varname>buildInputs</varname> and
+    <varname>propagatedBuildInputs</varname> attributes.  If something is
+    exclusively a build-time dependency, use
+    <varname>buildInputs</varname>; if it’s (also) a runtime dependency,
+    use <varname>propagatedBuildInputs</varname>.
+  </para>
+
+  <para>
+    By default <varname>meta.platforms</varname> is set to the same value
+    as the interpreter unless overriden otherwise.
+  </para>
+
+  <variablelist>
+    <title>
+      <varname>buildPythonPackage</varname> parameters
+      (all parameters from <varname>mkDerivation</varname> function are still supported)
+    </title>
+
+    <varlistentry>
+      <term><varname>namePrefix</varname></term>
+      <listitem><para>
+        Prepended text to <varname>${name}</varname> parameter.
+        Defaults to <literal>"python3.3-"</literal> for Python 3.3, etc. Set it to
+        <literal>""</literal>
+        if you're packaging an application or a command line tool.
+      </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+      <term><varname>disabled</varname></term>
+      <listitem><para>
+        If <varname>true</varname>, package is not build for
+        particular python interpreter version. Grep around
+        <filename>pkgs/top-level/python-packages.nix</filename>
+        for examples.
+      </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+      <term><varname>setupPyBuildFlags</varname></term>
+      <listitem><para>
+        List of flags passed to <command>setup.py build_ext</command> command.
+      </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+      <term><varname>pythonPath</varname></term>
+      <listitem><para>
+        List of packages to be added into <literal>$PYTHONPATH</literal>.
+        Packages in <varname>pythonPath</varname> are not propagated
+        (contrary to <varname>propagatedBuildInputs</varname>).
+      </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+      <term><varname>preShellHook</varname></term>
+      <listitem><para>
+        Hook to execute commands before <varname>shellHook</varname>.
+      </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+      <term><varname>postShellHook</varname></term>
+      <listitem><para>
+        Hook to execute commands after <varname>shellHook</varname>.
+      </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+      <term><varname>makeWrapperArgs</varname></term>
+      <listitem><para>
+        A list of strings. Arguments to be passed to
+        <varname>makeWrapper</varname>, which wraps generated binaries. By
+        default, the arguments to <varname>makeWrapper</varname> set
+        <varname>PATH</varname> and <varname>PYTHONPATH</varname> environment
+        variables before calling the binary. Additional arguments here can
+        allow a developer to set environment variables which will be
+        available when the binary is run. For example,
+        <varname>makeWrapperArgs = ["--set FOO BAR" "--set BAZ QUX"]</varname>.
+      </para></listitem>
+    </varlistentry>
+
+  </variablelist>
+
+</section>
+
+<section xml:id="ssec-python-build-env"><title><function>python.buildEnv</function> function</title>
+  <para>
+    Create Python environments using low-level <function>pkgs.buildEnv</function> function. Example <filename>default.nix</filename>:
+
+<programlisting language="nix">
+<![CDATA[with import <nixpkgs> {};
+
+python.buildEnv.override {
+  extraLibs = [ pkgs.pythonPackages.pyramid ];
+  ignoreCollisions = true;
+}]]>
+</programlisting>
+
+    Running <command>nix-build</command> will create
+    <filename>/nix/store/cf1xhjwzmdki7fasgr4kz6di72ykicl5-python-2.7.8-env</filename>
+    with wrapped binaries in <filename>bin/</filename>.
+  </para>
+
+  <para>
+  You can also use <varname>env</varname> attribute to create local
+  environments with needed packages installed (somewhat comparable to
+  <literal>virtualenv</literal>). For example, with the following
+  <filename>shell.nix</filename>:
+
+<programlisting language="nix">
+<![CDATA[with import <nixpkgs> {};
+
+(python3.buildEnv.override {
+  extraLibs = with python3Packages;
+    [ numpy
+      requests
+    ];
+}).env]]>
+</programlisting>
+
+  Running <command>nix-shell</command> will drop you into a shell where
+  <command>python</command> will have specified packages in its path.
+  </para>
+
+  <variablelist>
+    <title>
+      <function>python.buildEnv</function> arguments
+    </title>
+
+    <varlistentry>
+      <term><varname>extraLibs</varname></term>
+      <listitem><para>
+        List of packages installed inside the environment.
+      </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+      <term><varname>postBuild</varname></term>
+      <listitem><para>
+        Shell command executed after the build of environment.
+      </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+      <term><varname>ignoreCollisions</varname></term>
+      <listitem><para>
+         Ignore file collisions inside the environment (default is <varname>false</varname>).
+      </para></listitem>
+    </varlistentry>
+  </variablelist>
+</section>
+
+<section xml:id="ssec-python-tools"><title>Tools</title>
+
+<para>Packages inside nixpkgs are written by hand. However many tools
+exist in community to help save time. No tool is preferred at the moment.
+</para>
+
+<itemizedlist>
+
+  <listitem><para>
+    <link xlink:href="https://github.com/proger/python2nix">python2nix</link>
+    by Vladimir Kirillov
+  </para></listitem>
+
+  <listitem><para>
+    <link xlink:href="https://github.com/garbas/pypi2nix">pypi2nix</link>
+    by Rok Garbas
+  </para></listitem>
+
+  <listitem><para>
+    <link xlink:href="https://github.com/offlinehacker/pypi2nix">pypi2nix</link>
+    by Jaka Hudoklin
+  </para></listitem>
+
+</itemizedlist>
+
+</section>
+
+<section xml:id="ssec-python-development"><title>Development</title>
+
+  <para>
+    To develop Python packages <function>buildPythonPackage</function> has
+    additional logic inside <varname>shellPhase</varname> to run
+    <command>pip install -e . --prefix $TMPDIR/</command> for the package.
+  </para>
+
+  <warning><para><varname>shellPhase</varname> is executed only if <filename>setup.py</filename>
+  exists.</para></warning>
+
+  <para>
+    Given a <filename>default.nix</filename>:
+
+<programlisting language="nix">
+<![CDATA[with import <nixpkgs> {};
+
+buildPythonPackage {
+  name = "myproject";
+
+  buildInputs = with pkgs.pythonPackages; [ pyramid ];
+
+  src = ./.;
+}]]>
+</programlisting>
+
+    Running <command>nix-shell</command> with no arguments should give you
+    the environment in which the package would be build with
+    <command>nix-build</command>.
+  </para>
+
+  <para>
+    Shortcut to setup environments with C headers/libraries and python packages:
+
+    <programlisting language="bash">$ nix-shell -p pythonPackages.pyramid zlib libjpeg git</programlisting>
+  </para>
+
+  <note><para>
+    There is a boolean value <varname>lib.inNixShell</varname> set to
+    <varname>true</varname> if nix-shell is invoked.
+  </para></note>
+
+</section>
+
+<section xml:id="ssec-python-faq"><title>FAQ</title>
+
+<variablelist>
+
+  <varlistentry>
+    <term>How to solve circular dependencies?</term>
+    <listitem><para>
+      If you have packages <varname>A</varname> and <varname>B</varname> that
+      depend on each other, when packaging <varname>B</varname> override package
+      <varname>A</varname> not to depend on <varname>B</varname> as input
+      (and also the other way around).
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>install_data / data_files</varname> problems resulting into <literal>error: could not create '/nix/store/6l1bvljpy8gazlsw2aw9skwwp4pmvyxw-python-2.7.8/etc': Permission denied</literal></term>
+    <listitem><para>
+      <link xlink:href="https://bitbucket.org/pypa/setuptools/issue/130/install_data-doesnt-respect-prefix">
+      Known bug in setuptools <varname>install_data</varname> does not respect --prefix</link>. Example of
+      such package using the feature is <filename>pkgs/tools/X11/xpra/default.nix</filename>. As workaround
+      install it as an extra <varname>preInstall</varname> step:
+
+      <programlisting>${python.interpreter} setup.py install_data --install-dir=$out --root=$out
+sed -i '/ = data_files/d' setup.py</programlisting>
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term>Rationale of non-existent global site-packages</term>
+    <listitem><para>
+      There is no need to have global site-packages in Nix. Each package has isolated
+      dependency tree and installing any python package will only populate <varname>$PATH</varname>
+      inside user environment. See <xref linkend="ssec-python-build-env" /> to create self-contained
+      interpreter with a set of packages.
+    </para></listitem>
+  </varlistentry>
+
+</variablelist>
+
+</section>
+
+
+<section xml:id="ssec-python-contrib"><title>Contributing guidelines</title>
+<para>
+  Following rules are desired to be respected:
+</para>
+
+<itemizedlist>
+
+  <listitem><para>
+    Make sure package builds for all python interpreters. Use <varname>disabled</varname> argument to
+    <function>buildPythonPackage</function> to set unsupported interpreters.
+  </para></listitem>
+
+  <listitem><para>
+    If tests need to be disabled for a package, make sure you leave a comment about reasoning.
+  </para></listitem>
+
+  <listitem><para>
+    Packages in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/python-packages.nix"><filename>pkgs/top-level/python-packages.nix</filename></link>
+    are sorted quasi-alphabetically to avoid merge conflicts.
+  </para></listitem>
+
+</itemizedlist>
+
+</section>
+
+</section>
+
--- a/doc/languages-frameworks/qt.xml
+++ b/doc/languages-frameworks/qt.xml
@@ -1,74 +1,70 @@
 <section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="sec-language-qt">
- <title>Qt</title>

- <para>
-  Qt is a comprehensive desktop and mobile application development toolkit for
-  C++. Legacy support is available for Qt 3 and Qt 4, but all current
-  development uses Qt 5. The Qt 5 packages in Nixpkgs are updated frequently to
-  take advantage of new features, but older versions are typically retained
-  until their support window ends. The most important consideration in
-  packaging Qt-based software is ensuring that each package and all its
-  dependencies use the same version of Qt 5; this consideration motivates most
-  of the tools described below.
- </para>
+<title>Qt</title>

- <section xml:id="ssec-qt-libraries">
-  <title>Packaging Libraries for Nixpkgs</title>
+<para>The information in this section applies to Qt 5.5 and later.</para>

-  <para>
-   Whenever possible, libraries that use Qt 5 should be built with each
-   available version. Packages providing libraries should be added to the
-   top-level function <varname>mkLibsForQt5</varname>, which is used to build a
-   set of libraries for every Qt 5 version. A special
-   <varname>callPackage</varname> function is used in this scope to ensure that
-   the entire dependency tree uses the same Qt 5 version. Import dependencies
-   unqualified, i.e., <literal>qtbase</literal> not
-   <literal>qt5.qtbase</literal>. <emphasis>Do not</emphasis> import a package
-   set such as <literal>qt5</literal> or <literal>libsForQt5</literal>.
-  </para>
+<para>Qt is an application development toolkit for C++. Although it is
+not a distinct programming language, there are special considerations
+for packaging Qt-based programs and libraries. A small set of tools
+and conventions has grown out of these considerations.</para>

-  <para>
-   If a library does not support a particular version of Qt 5, it is best to
-   mark it as broken by setting its <literal>meta.broken</literal> attribute. A
-   package may be marked broken for certain versions by testing the
-   <literal>qtbase.version</literal> attribute, which will always give the
-   current Qt 5 version.
-  </para>
- </section>
+<section xml:id="ssec-qt-libraries"><title>Libraries</title>

- <section xml:id="ssec-qt-applications">
-  <title>Packaging Applications for Nixpkgs</title>
+<para>Packages that provide libraries should be listed in
+<varname>qt5LibsFun</varname> so that the library is built with each
+Qt version. A set of packages is provided for each version of Qt; for
+example, <varname>qt5Libs</varname> always provides libraries built
+with the latest version, <varname>qt55Libs</varname> provides
+libraries built with Qt 5.5, and so on. To avoid version conflicts, no
+top-level attributes are created for these packages.</para>

-  <para>
-   Call your application expression using
-   <literal>libsForQt5.callPackage</literal> instead of
-   <literal>callPackage</literal>. Import dependencies unqualified, i.e.,
-   <literal>qtbase</literal> not <literal>qt5.qtbase</literal>. <emphasis>Do
-   not</emphasis> import a package set such as <literal>qt5</literal> or
-   <literal>libsForQt5</literal>.
-  </para>
-
-  <para>
-   Qt 5 maintains strict backward compatibility, so it is generally best to
-   build an application package against the latest version using the
-   <varname>libsForQt5</varname> library set. In case a package does not build
-   with the latest Qt version, it is possible to pick a set pinned to a
-   particular version, e.g. <varname>libsForQt55</varname> for Qt 5.5, if that
-   is the latest version the package supports. If a package must be pinned to
-   an older Qt version, be sure to file a bug upstream; because Qt is strictly
-   backwards-compatible, any incompatibility is by definition a bug in the
-   application.
-  </para>
-
-  <para>
-   When testing applications in Nixpkgs, it is a common practice to build the
-   package with <literal>nix-build</literal> and run it using the created
-   symbolic link. This will not work with Qt applications, however, because
-   they have many hard runtime requirements that can only be guaranteed if the
-   package is actually installed. To test a Qt application, install it with
-   <literal>nix-env</literal> or run it inside <literal>nix-shell</literal>.
-  </para>
- </section>
 </section>
+
+<section xml:id="ssec-qt-programs"><title>Programs</title>
+
+<para>Application packages do not need to be built with every Qt
+version. To ensure consistency between the package's dependencies,
+call the package with <literal>qt5Libs.callPackage</literal> instead
+of the usual <literal>callPackage</literal>. An older version may be
+selected in case of incompatibility. For example, to build with Qt
+5.5, call the package with
+<literal>qt55Libs.callPackage</literal>.</para>
+
+<para>Several environment variables must be set at runtime for Qt
+applications to function correctly, including:</para>
+
+<itemizedlist>
+  <listitem><para><envar>QT_PLUGIN_PATH</envar></para></listitem>
+  <listitem><para><envar>QML_IMPORT_PATH</envar></para></listitem>
+  <listitem><para><envar>QML2_IMPORT_PATH</envar></para></listitem>
+  <listitem><para><envar>XDG_DATA_DIRS</envar></para></listitem>
+</itemizedlist>
+
+<para>To ensure that these are set correctly, the program must be wrapped by
+invoking <literal>wrapQtProgram <replaceable>program</replaceable></literal>
+during installation (for example, during
+<literal>fixupPhase</literal>). <literal>wrapQtProgram</literal>
+accepts the same options as <literal>makeWrapper</literal>.
+</para>
+
+</section>
+
+<section xml:id="ssec-qt-kde"><title>KDE</title>
+
+<para>Many of the considerations above also apply to KDE packages,
+especially the need to set the correct environment variables at
+runtime. To ensure that this is done, invoke <literal>wrapKDEProgram
+<replaceable>program</replaceable></literal> during
+installation. <literal>wrapKDEProgram</literal> also generates a
+<literal>ksycoca</literal> database so that required data and services
+can be found. Like its Qt counterpart,
+<literal>wrapKDEProgram</literal> accepts the same options as
+<literal>makeWrapper</literal>.</para>
+
+</section>
+
+</section>
+
--- a/doc/languages-frameworks/r.section.md
+++ b/doc/languages-frameworks/r.section.md
@@ -1,120 +0,0 @@
-R packages
-==========
-
-## Installation
-
-Define an environment for R that contains all the libraries that you'd like to
-use by adding the following snippet to your $HOME/.config/nixpkgs/config.nix file:
-
-```nix
-{
-    packageOverrides = super: let self = super.pkgs; in
-    {
-
-        rEnv = super.rWrapper.override {
-            packages = with self.rPackages; [
-                devtools
-                ggplot2
-                reshape2
-                yaml
-                optparse
-                ];
-        };
-    };
-}
-```
-
-Then you can use `nix-env -f "<nixpkgs>" -iA rEnv` to install it into your user
-profile. The set of available libraries can be discovered by running the
-command `nix-env -f "<nixpkgs>" -qaP -A rPackages`. The first column from that
-output is the name that has to be passed to rWrapper in the code snipped above.
-
-However, if you'd like to add a file to your project source to make the
-environment available for other contributors, you can create a `default.nix`
-file like so:
-```nix
-let
-  pkgs = import <nixpkgs> {};
-  stdenv = pkgs.stdenv;
-in with pkgs; {
-  myProject = stdenv.mkDerivation {
-    name = "myProject";
-    version = "1";
-    src = if pkgs.lib.inNixShell then null else nix;
-
-    buildInputs = with rPackages; [
-      R
-      ggplot2
-      knitr
-    ];
-  };
-}
-```
-and then run `nix-shell .` to be dropped into a shell with those packages
-available.
-
-## RStudio
-
-RStudio uses a standard set of packages and ignores any custom R
-environments or installed packages you may have.  To create a custom
-environment, see `rstudioWrapper`, which functions similarly to
-`rWrapper`:
-
-```nix
-{
-    packageOverrides = super: let self = super.pkgs; in
-    {
-
-        rstudioEnv = super.rstudioWrapper.override {
-            packages = with self.rPackages; [
-                dplyr
-                ggplot2
-                reshape2
-                ];
-        };
-    };
-}
-```
-
-Then like above, `nix-env -f "<nixpkgs>" -iA rstudioEnv` will install
-this into your user profile.
-
-Alternatively, you can create a self-contained `shell.nix` without the need to
-modify any configuration files:
-
-```nix
-{ pkgs ? import <nixpkgs> {}
-}:
-
-pkgs.rstudioWrapper.override {
-  packages = with pkgs.rPackages; [ dplyr ggplot2 reshape2 ];
-}
-
-```
-
-Executing `nix-shell` will then drop you into an environment equivalent to the
-one above. If you need additional packages just add them to the list and
-re-enter the shell.
-
-## Updating the package set
-
-```bash
-nix-shell generate-shell.nix
-
-Rscript generate-r-packages.R cran  > cran-packages.nix.new
-mv cran-packages.nix.new cran-packages.nix
-
-Rscript generate-r-packages.R bioc  > bioc-packages.nix.new
-mv bioc-packages.nix.new bioc-packages.nix
-```
-
-`generate-r-packages.R <repo>` reads  `<repo>-packages.nix`, therefor the renaming.
-
-
-## Testing if the Nix-expression could be evaluated
-
-```bash
-nix-build test-evaluation.nix --dry-run
-```
-
-If this exits fine, the expression is ok. If not, you have to edit `default.nix`
--- a/doc/languages-frameworks/ruby.xml
+++ b/doc/languages-frameworks/ruby.xml
@@ -1,41 +1,36 @@
 <section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="sec-language-ruby">
- <title>Ruby</title>

- <para>
-  There currently is support to bundle applications that are packaged as Ruby
-  gems. The utility "bundix" allows you to write a
-  <filename>Gemfile</filename>, let bundler create a
-  <filename>Gemfile.lock</filename>, and then convert this into a nix
-  expression that contains all Gem dependencies automatically.
- </para>
+<title>Ruby</title>

- <para>
-  For example, to package sensu, we did:
- </para>
+  <para>There currently is support to bundle applications that are packaged as Ruby gems. The utility "bundix" allows you to write a <filename>Gemfile</filename>, let bundler create a <filename>Gemfile.lock</filename>, and then convert
+  this into a nix expression that contains all Gem dependencies automatically.</para>
+
+  <para>For example, to package sensu, we did:</para>

 <screen>
 <![CDATA[$ cd pkgs/servers/monitoring
 $ mkdir sensu
-$ cd sensu
 $ cat > Gemfile
 source 'https://rubygems.org'
 gem 'sensu'
-$ $(nix-build '<nixpkgs>' -A bundix --no-out-link)/bin/bundix --magic
+$ bundler package --path /tmp/vendor/bundle
+$ $(nix-build '<nixpkgs>' -A bundix)/bin/bundix
 $ cat > default.nix
 { lib, bundlerEnv, ruby }:

-bundlerEnv rec {
-  name = "sensu-${version}";
+bundlerEnv {
+  name = "sensu-0.17.1";

-  version = (import gemset).sensu.version;
  inherit ruby;
-  # expects Gemfile, Gemfile.lock and gemset.nix in the same directory
-  gemdir = ./.;
+  gemfile = ./Gemfile;
+  lockfile = ./Gemfile.lock;
+  gemset = ./gemset.nix;

  meta = with lib; {
-    description = "A monitoring framework that aims to be simple, malleable, and scalable";
+    description = "A monitoring framework that aims to be simple, malleable,
+and scalable";
    homepage    = http://sensuapp.org/;
    license     = with licenses; mit;
    maintainers = with maintainers; [ theuni ];
@@ -44,62 +39,15 @@ bundlerEnv rec {
 }]]>
 </screen>

- <para>
-  Please check in the <filename>Gemfile</filename>,
-  <filename>Gemfile.lock</filename> and the <filename>gemset.nix</filename> so
-  future updates can be run easily.
- </para>
+<para>Please check in the <filename>Gemfile</filename>, <filename>Gemfile.lock</filename> and the <filename>gemset.nix</filename> so future updates can be run easily.
+</para>

- <para>
-  For tools written in Ruby - i.e. where the desire is to install a package and
-  then execute e.g. <command>rake</command> at the command line, there is an
-  alternative builder called <literal>bundlerApp</literal>. Set up the
-  <filename>gemset.nix</filename> the same way, and then, for example:
- </para>
-
-<screen>
-<![CDATA[{ lib, bundlerApp }:
-
-bundlerApp {
-  pname = "corundum";
-  gemdir = ./.;
-  exes = [ "corundum-skel" ];
-
-  meta = with lib; {
-    description = "Tool and libraries for maintaining Ruby gems.";
-    homepage    = https://github.com/nyarly/corundum;
-    license     = licenses.mit;
-    maintainers = [ maintainers.nyarly ];
-    platforms   = platforms.unix;
-  };
-}]]>
-</screen>
-
- <para>
-  The chief advantage of <literal>bundlerApp</literal> over
-  <literal>bundlerEnv</literal> is the executables introduced in the
-  environment are precisely those selected in the <literal>exes</literal> list,
-  as opposed to <literal>bundlerEnv</literal> which adds all the executables
-  made available by gems in the gemset, which can mean e.g.
-  <command>rspec</command> or <command>rake</command> in unpredictable versions
-  available from various packages.
- </para>
-
- <para>
-  Resulting derivations for both builders also have two helpful attributes,
-  <literal>env</literal> and <literal>wrappedRuby</literal>. The first one
-  allows one to quickly drop into <command>nix-shell</command> with the
-  specified environment present. E.g. <command>nix-shell -A sensu.env</command>
-  would give you an environment with Ruby preset so it has all the libraries
-  necessary for <literal>sensu</literal> in its paths. The second one can be
-  used to make derivations from custom Ruby scripts which have
-  <filename>Gemfile</filename>s with their dependencies specified. It is a
-  derivation with <command>ruby</command> wrapped so it can find all the needed
-  dependencies. For example, to make a derivation <literal>my-script</literal>
-  for a <filename>my-script.rb</filename> (which should be placed in
-  <filename>bin</filename>) you should run <command>bundix</command> as
-  specified above and then use <literal>bundlerEnv</literal> like this:
- </para>
+<para>Resulting derivations also have two helpful items, <literal>env</literal> and <literal>wrapper</literal>. The first one allows one to quickly drop into
+<command>nix-shell</command> with the specified environment present. E.g. <command>nix-shell -A sensu.env</command> would give you an environment with Ruby preset
+so it has all the libraries necessary for <literal>sensu</literal> in its paths. The second one can be used to make derivations from custom Ruby scripts which have
+<filename>Gemfile</filename>s with their dependencies specified. It is a derivation with <command>ruby</command> wrapped so it can find all the needed dependencies.
+For example, to make a derivation <literal>my-script</literal> for a <filename>my-script.rb</filename> (which should be placed in <filename>bin</filename>) you should
+run <command>bundix</command> as specified above and then use <literal>bundlerEnv</literal> lile this:</para>

 <programlisting>
 <![CDATA[let env = bundlerEnv {
@@ -113,12 +61,18 @@ bundlerApp {

 in stdenv.mkDerivation {
  name = "my-script";
-  buildInputs = [ env.wrappedRuby ];
+
+  buildInputs = [ env.wrapper ];
+
  script = ./my-script.rb;
+
  buildCommand = ''
+    mkdir -p $out/bin
    install -D -m755 $script $out/bin/my-script
    patchShebangs $out/bin/my-script
  '';
 }]]>
 </programlisting>
+
 </section>
+
--- a/doc/languages-frameworks/rust.section.md
+++ b/doc/languages-frameworks/rust.section.md
@@ -1,395 +0,0 @@
---
-title: Rust
-author: Matthias Beyer
-date: 2017-03-05
---
-
-# User's Guide to the Rust Infrastructure
-
-To install the rust compiler and cargo put
-
-```
-rustc
-cargo
-```
-
-into the `environment.systemPackages` or bring them into
-scope with `nix-shell -p rustc cargo`.
-
-> If you are using NixOS and you want to use rust without a nix expression you
-> probably want to add the following in your `configuration.nix` to build
-> crates with C dependencies.
->
->     environment.systemPackages = [binutils gcc gnumake openssl pkgconfig]
-
-For daily builds (beta and nightly) use either rustup from
-nixpkgs or use the [Rust nightlies
-overlay](#using-the-rust-nightlies-overlay).
-
-## Compiling Rust applications with Cargo
-
-Rust applications are packaged by using the `buildRustPackage` helper from `rustPlatform`:
-
-```
-rustPlatform.buildRustPackage rec {
-  name = "ripgrep-${version}";
-  version = "0.4.0";
-
-  src = fetchFromGitHub {
-    owner = "BurntSushi";
-    repo = "ripgrep";
-    rev = "${version}";
-    sha256 = "0y5d1n6hkw85jb3rblcxqas2fp82h3nghssa4xqrhqnz25l799pj";
-  };
-
-  cargoSha256 = "0q68qyl2h6i0qsz82z840myxlnjay8p1w5z7hfyr8fqp7wgwa9cx";
-
-  meta = with stdenv.lib; {
-    description = "A fast line-oriented regex search tool, similar to ag and ack";
-    homepage = https://github.com/BurntSushi/ripgrep;
-    license = licenses.unlicense;
-    maintainers = [ maintainers.tailhook ];
-    platforms = platforms.all;
-  };
-}
-```
-
-`buildRustPackage` requires a `cargoSha256` attribute which is computed over
-all crate sources of this package. Currently it is obtained by inserting a
-fake checksum into the expression and building the package once. The correct
-checksum can be then take from the failed build.
-
-When the `Cargo.lock`, provided by upstream, is not in sync with the
-`Cargo.toml`, it is possible to use `cargoPatches` to update it. All patches
-added in `cargoPatches` will also be prepended to the patches in `patches` at
-build-time.
-
-## Compiling Rust crates using Nix instead of Cargo
-
-### Simple operation
-
-When run, `cargo build` produces a file called `Cargo.lock`,
-containing pinned versions of all dependencies. Nixpkgs contains a
-tool called `carnix` (`nix-env -iA nixos.carnix`), which can be used
-to turn a `Cargo.lock` into a Nix expression.
-
-That Nix expression calls `rustc` directly (hence bypassing Cargo),
-and can be used to compile a crate and all its dependencies. Here is
-an example for a minimal `hello` crate:
-
-
-    $ cargo new hello
-    $ cd hello
-    $ cargo build
-     Compiling hello v0.1.0 (file:///tmp/hello)
-      Finished dev [unoptimized + debuginfo] target(s) in 0.20 secs
-    $ carnix -o hello.nix --src ./. Cargo.lock --standalone
-    $ nix-build hello.nix -A hello_0_1_0
-
-Now, the file produced by the call to `carnix`, called `hello.nix`, looks like:
-
-```
-# Generated by carnix 0.6.5: carnix -o hello.nix --src ./. Cargo.lock --standalone
-{ lib, stdenv, buildRustCrate, fetchgit }:
-let kernel = stdenv.buildPlatform.parsed.kernel.name;
-    # ... (content skipped)
-in
-rec {
-  hello = f: hello_0_1_0 { features = hello_0_1_0_features { hello_0_1_0 = f; }; };
-  hello_0_1_0_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
-    crateName = "hello";
-    version = "0.1.0";
-    authors = [ "pe@pijul.org <pe@pijul.org>" ];
-    src = ./.;
-    inherit dependencies buildDependencies features;
-  };
-  hello_0_1_0 = { features?(hello_0_1_0_features {}) }: hello_0_1_0_ {};
-  hello_0_1_0_features = f: updateFeatures f (rec {
-        hello_0_1_0.default = (f.hello_0_1_0.default or true);
-    }) [ ];
-}
-```
-
-In particular, note that the argument given as `--src` is copied
-verbatim to the source. If we look at a more complicated
-dependencies, for instance by adding a single line `libc="*"` to our
-`Cargo.toml`, we first need to run `cargo build` to update the
-`Cargo.lock`. Then, `carnix` needs to be run again, and produces the
-following nix file:
-
-```
-# Generated by carnix 0.6.5: carnix -o hello.nix --src ./. Cargo.lock --standalone
-{ lib, stdenv, buildRustCrate, fetchgit }:
-let kernel = stdenv.buildPlatform.parsed.kernel.name;
-    # ... (content skipped)
-in
-rec {
-  hello = f: hello_0_1_0 { features = hello_0_1_0_features { hello_0_1_0 = f; }; };
-  hello_0_1_0_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
-    crateName = "hello";
-    version = "0.1.0";
-    authors = [ "pe@pijul.org <pe@pijul.org>" ];
-    src = ./.;
-    inherit dependencies buildDependencies features;
-  };
-  libc_0_2_36_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
-    crateName = "libc";
-    version = "0.2.36";
-    authors = [ "The Rust Project Developers" ];
-    sha256 = "01633h4yfqm0s302fm0dlba469bx8y6cs4nqc8bqrmjqxfxn515l";
-    inherit dependencies buildDependencies features;
-  };
-  hello_0_1_0 = { features?(hello_0_1_0_features {}) }: hello_0_1_0_ {
-    dependencies = mapFeatures features ([ libc_0_2_36 ]);
-  };
-  hello_0_1_0_features = f: updateFeatures f (rec {
-    hello_0_1_0.default = (f.hello_0_1_0.default or true);
-    libc_0_2_36.default = true;
-  }) [ libc_0_2_36_features ];
-  libc_0_2_36 = { features?(libc_0_2_36_features {}) }: libc_0_2_36_ {
-    features = mkFeatures (features.libc_0_2_36 or {});
-  };
-  libc_0_2_36_features = f: updateFeatures f (rec {
-    libc_0_2_36.default = (f.libc_0_2_36.default or true);
-    libc_0_2_36.use_std =
-      (f.libc_0_2_36.use_std or false) ||
-      (f.libc_0_2_36.default or false) ||
-      (libc_0_2_36.default or false);
-  }) [];
-}
-```
-
-Here, the `libc` crate has no `src` attribute, so `buildRustCrate`
-will fetch it from [crates.io](https://crates.io). A `sha256`
-attribute is still needed for Nix purity.
-
-### Handling external dependencies
-
-Some crates require external libraries. For crates from
-[crates.io](https://crates.io), such libraries can be specified in
-`defaultCrateOverrides` package in nixpkgs itself.
-
-Starting from that file, one can add more overrides, to add features
-or build inputs by overriding the hello crate in a seperate file.
-
-```
-with import <nixpkgs> {};
-((import ./hello.nix).hello {}).override {
-  crateOverrides = defaultCrateOverrides // {
-    hello = attrs: { buildInputs = [ openssl ]; };
-  };
-}
-```
-
-Here, `crateOverrides` is expected to be a attribute set, where the
-key is the crate name without version number and the value a function.
-The function gets all attributes passed to `buildRustCrate` as first
-argument and returns a set that contains all attribute that should be
-overwritten.
-
-For more complicated cases, such as when parts of the crate's
-derivation depend on the the crate's version, the `attrs` argument of
-the override above can be read, as in the following example, which
-patches the derivation:
-
-```
-with import <nixpkgs> {};
-((import ./hello.nix).hello {}).override {
-  crateOverrides = defaultCrateOverrides // {
-    hello = attrs: lib.optionalAttrs (lib.versionAtLeast attrs.version "1.0")  {
-      postPatch = ''
-        substituteInPlace lib/zoneinfo.rs \
-          --replace "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo"
-      '';
-    };
-  };
-}
-```
-
-Another situation is when we want to override a nested
-dependency. This actually works in the exact same way, since the
-`crateOverrides` parameter is forwarded to the crate's
-dependencies. For instance, to override the build inputs for crate
-`libc` in the example above, where `libc` is a dependency of the main
-crate, we could do:
-
-```
-with import <nixpkgs> {};
-((import hello.nix).hello {}).override {
-  crateOverrides = defaultCrateOverrides // {
-    libc = attrs: { buildInputs = []; };
-  };
-}
-```
-
-### Options and phases configuration
-
-Actually, the overrides introduced in the previous section are more
-general. A number of other parameters can be overridden:
-
- The version of rustc used to compile the crate:
-
-  ```
-  (hello {}).override { rust = pkgs.rust; };
-  ```
-
- Whether to build in release mode or debug mode (release mode by
-  default):
-
-  ```
-  (hello {}).override { release = false; };
-  ```
-
- Whether to print the commands sent to rustc when building
-  (equivalent to `--verbose` in cargo:
-
-  ```
-  (hello {}).override { verbose = false; };
-  ```
-
- Extra arguments to be passed to `rustc`:
-
-  ```
-  (hello {}).override { extraRustcOpts = "-Z debuginfo=2"; };
-  ```
-
- Phases, just like in any other derivation, can be specified using
-  the following attributes: `preUnpack`, `postUnpack`, `prePatch`,
-  `patches`, `postPatch`, `preConfigure` (in the case of a Rust crate,
-  this is run before calling the "build" script), `postConfigure`
-  (after the "build" script),`preBuild`, `postBuild`, `preInstall` and
-  `postInstall`. As an example, here is how to create a new module
-  before running the build script:
-
-  ```
-  (hello {}).override {
-    preConfigure = ''
-       echo "pub const PATH=\"${hi.out}\";" >> src/path.rs"
-    '';
-  };
-  ```
-
-### Features
-
-One can also supply features switches. For example, if we want to
-compile `diesel_cli` only with the `postgres` feature, and no default
-features, we would write:
-
-```
-(callPackage ./diesel.nix {}).diesel {
-  default = false;
-  postgres = true;
-}
-```
-
-Where `diesel.nix` is the file generated by Carnix, as explained above.
-
-
-## Setting Up `nix-shell`
-Oftentimes you want to develop code from within `nix-shell`. Unfortunately
-`buildRustCrate` does not support common `nix-shell` operations directly
-(see [this issue](https://github.com/NixOS/nixpkgs/issues/37945))
-so we will use `stdenv.mkDerivation` instead.
-
-Using the example `hello` project above, we want to do the following:
- Have access to `cargo` and `rustc`
- Have the `openssl` library available to a crate through it's _normal_
-  compilation mechanism (`pkg-config`).
-
-A typical `shell.nix` might look like:
-
-```
-with import <nixpkgs> {};
-
-stdenv.mkDerivation {
-  name = "rust-env";
-  buildInputs = [
-    rustc cargo
-
-    # Example Additional Dependencies
-    pkgconfig openssl
-  ];
-
-  # Set Environment Variables
-  RUST_BACKTRACE = 1;
-}
-```
-
-You should now be able to run the following:
-```
-$ nix-shell --pure
-$ cargo build
-$ cargo test
-```
-
-### Controlling Rust Version Inside `nix-shell`
-To control your rust version (i.e. use nightly) from within `shell.nix` (or
-other nix expressions) you can use the following `shell.nix`
-
-```
-# Latest Nightly
-with import <nixpkgs> {};
-let src = fetchFromGitHub {
-      owner = "mozilla";
-      repo = "nixpkgs-mozilla";
-      # commit from: 2018-03-27
-      rev = "2945b0b6b2fd19e7d23bac695afd65e320efcebe";
-      sha256 = "034m1dryrzh2lmjvk3c0krgip652dql46w5yfwpvh7gavd3iypyw";
-   };
-in
-with import "${src.out}/rust-overlay.nix" pkgs pkgs;
-stdenv.mkDerivation {
-  name = "rust-env";
-  buildInputs = [
-    # Note: to use use stable, just replace `nightly` with `stable`
-    latest.rustChannels.nightly.rust
-
-    # Add some extra dependencies from `pkgs`
-    pkgconfig openssl
-  ];
-
-  # Set Environment Variables
-  RUST_BACKTRACE = 1;
-}
-```
-
-Now run:
-```
-$ rustc --version
-rustc 1.26.0-nightly (188e693b3 2018-03-26)
-```
-
-To see that you are using nightly.
-
-
-## Using the Rust nightlies overlay
-
-Mozilla provides an overlay for nixpkgs to bring a nightly version of Rust into scope.
-This overlay can _also_ be used to install recent unstable or stable versions
-of Rust, if desired.
-
-To use this overlay, clone
-[nixpkgs-mozilla](https://github.com/mozilla/nixpkgs-mozilla),
-and create a symbolic link to the file
-[rust-overlay.nix](https://github.com/mozilla/nixpkgs-mozilla/blob/master/rust-overlay.nix)
-in the `~/.config/nixpkgs/overlays` directory.
-
-    $ git clone https://github.com/mozilla/nixpkgs-mozilla.git
-    $ mkdir -p ~/.config/nixpkgs/overlays
-    $ ln -s $(pwd)/nixpkgs-mozilla/rust-overlay.nix ~/.config/nixpkgs/overlays/rust-overlay.nix
-
-The latest version can be installed with the following command:
-
-    $ nix-env -Ai nixos.latest.rustChannels.stable.rust
-
-Or using the attribute with nix-shell:
-
-    $ nix-shell -p nixos.latest.rustChannels.stable.rust
-
-To install the beta or nightly channel, "stable" should be substituted by
-"nightly" or "beta", or
-use the function provided by this overlay to pull a version based on a
-build date.
-
-The overlay automatically updates itself as it uses the same source as
-[rustup](https://www.rustup.rs/).
--- a/doc/languages-frameworks/texlive.xml
+++ b/doc/languages-frameworks/texlive.xml
@@ -1,42 +1,27 @@
 <section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="sec-language-texlive">
- <title>TeX Live</title>

- <para>
-  Since release 15.09 there is a new TeX Live packaging that lives entirely
-  under attribute <varname>texlive</varname>.
- </para>
-
- <section xml:id="sec-language-texlive-users-guide">
-  <title>User's guide</title>
+<title>TeX Live</title>

+<para>Since release 15.09 there is a new TeX Live packaging that lives entirely under attribute <varname>texlive</varname>.</para>
+<section><title>User's guide</title>
  <itemizedlist>
-   <listitem>
-    <para>
-     For basic usage just pull <varname>texlive.combined.scheme-basic</varname>
-     for an environment with basic LaTeX support.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It typically won't work to use separately installed packages together.
-     Instead, you can build a custom set of packages like this:
-<programlisting>
+    <listitem><para>
+      For basic usage just pull <varname>texlive.combined.scheme-basic</varname> for an environment with basic LaTeX support.</para></listitem>
+    <listitem><para>
+      It typically won't work to use separately installed packages together.
+      Instead, you can build a custom set of packages like this:
+      <programlisting>
 texlive.combine {
  inherit (texlive) scheme-small collection-langkorean algorithms cm-super;
 }
      </programlisting>
-     There are all the schemes, collections and a few thousand packages, as
-     defined upstream (perhaps with tiny differences).
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     By default you only get executables and files needed during runtime, and a
-     little documentation for the core packages. To change that, you need to
-     add <varname>pkgFilter</varname> function to <varname>combine</varname>.
-<programlisting>
+      There are all the schemes, collections and a few thousand packages, as defined upstream (perhaps with tiny differences).
+    </para></listitem>
+    <listitem><para>
+      By default you only get executables and files needed during runtime, and a little documentation for the core packages.  To change that, you need to add <varname>pkgFilter</varname> function to <varname>combine</varname>.
+      <programlisting>
 texlive.combine {
  # inherit (texlive) whatever-you-want;
  pkgFilter = pkg:
@@ -45,55 +30,30 @@ texlive.combine {
  # there are also other attributes: version, name
 }
      </programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     You can list packages e.g. by <command>nix repl</command>.
-<programlisting><![CDATA[
-$ nix repl
-nix-repl> :l <nixpkgs>
-nix-repl> texlive.collection-<TAB>
-]]></programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Note that the wrapper assumes that the result has a chance to be useful.
-     For example, the core executables should be present, as well as some core
-     data files. The supported way of ensuring this is by including some
-     scheme, for example <varname>scheme-basic</varname>, into the combination.
-    </para>
-   </listitem>
+    </para></listitem>
+    <listitem><para>
+      You can list packages e.g. by <command>nix-repl</command>.
+      <programlisting>
+$ nix-repl
+nix-repl> texlive.collection-&lt;TAB>
+      </programlisting>
+    </para></listitem>
  </itemizedlist>
- </section>
-
- <section xml:id="sec-language-texlive-known-problems">
-  <title>Known problems</title>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Some tools are still missing, e.g. luajittex;
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     some apps aren't packaged/tested yet (asymptote, biber, etc.);
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     feature/bug: when a package is rejected by <varname>pkgFilter</varname>,
-     its dependencies are still propagated;
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     in case of any bugs or feature requests, file a github issue or better a
-     pull request and /cc @vcunat.
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
 </section>
+
+<section><title>Known problems</title>
+  <itemizedlist>
+    <listitem><para>
+      Some tools are still missing, e.g. luajittex;</para></listitem>
+    <listitem><para>
+      some apps aren't packaged/tested yet (asymptote, biber, etc.);</para></listitem>
+    <listitem><para>
+      feature/bug: when a package is rejected by <varname>pkgFilter</varname>, its dependencies are still propagated;</para></listitem>
+    <listitem><para>
+      in case of any bugs or feature requests, file a github issue or better a pull request and /cc @vcunat.</para></listitem>
+  </itemizedlist>
+</section>
+
+
+</section>
+
--- a/doc/languages-frameworks/vim.section.md
+++ b/doc/languages-frameworks/vim.section.md
@@ -1,193 +0,0 @@
---
-title: User's Guide for Vim in Nixpkgs
-author: Marc Weber
-date: 2016-06-25
---
-# User's Guide to Vim Plugins/Addons/Bundles/Scripts in Nixpkgs
-
-Both Neovim and Vim can be configured to include your favorite plugins
-and additional libraries.
-
-Loading can be deferred; see examples.
-
-At the moment we support three different methods for managing plugins:
-
- Vim packages (*recommend*)
- VAM (=vim-addon-manager)
- Pathogen
-
-## Custom configuration
-
-Adding custom .vimrc lines can be done using the following code:
-
-```
-vim_configurable.customize {
-  # `name` specifies the name of the executable and package
-  name = "vim-with-plugins";
-
-  vimrcConfig.customRC = ''
-    set hidden
-  '';
-}
-```
-
-This configuration is used when vim is invoked with the command specified as name, in this case `vim-with-plugins`.
-
-For Neovim the `configure` argument can be overridden to achieve the same:
-
-```
-neovim.override {
-  configure = {
-    customRC = ''
-      # here your custom configuration goes!
-    '';
-  };
-}
-```
-
-## Managing plugins with Vim packages
-
-To store you plugins in Vim packages the following example can be used:
-
-```
-vim_configurable.customize {
-  vimrcConfig.packages.myVimPackage = with pkgs.vimPlugins; {
-    # loaded on launch
-    start = [ youcompleteme fugitive ];
-    # manually loadable by calling `:packadd $plugin-name`
-    opt = [ phpCompletion elm-vim ];
-    # To automatically load a plugin when opening a filetype, add vimrc lines like:
-    # autocmd FileType php :packadd phpCompletion
-  };
-}
-```
-
-For Neovim the syntax is
-
-```
-neovim.override {
-  configure = {
-    customRC = ''
-      # here your custom configuration goes!
-    '';
-    packages.myVimPackage = with pkgs.vimPlugins; {
-      # see examples below how to use custom packages
-      start = [ ];
-      opt = [ ];
-    };
-  };
-}
-```
-
-The resulting package can be added to `packageOverrides` in `~/.nixpkgs/config.nix` to make it installable:
-
-```
-{
-  packageOverrides = pkgs: with pkgs; {
-    myVim = vim_configurable.customize {
-      # `name` specifies the name of the executable and package
-      name = "vim-with-plugins";
-      # add here code from the example section
-    };
-    myNeovim = neovim.override {
-      configure = {
-      # add here code from the example section
-      };
-    };
-  };
-}
-```
-
-After that you can install your special grafted `myVim` or `myNeovim` packages.
-
-## Managing plugins with VAM
-
-### Handling dependencies of Vim plugins
-
-VAM introduced .json files supporting dependencies without versioning
-assuming that "using latest version" is ok most of the time.
-
-### Example
-
-First create a vim-scripts file having one plugin name per line. Example:
-
-    "tlib"
-    {'name': 'vim-addon-sql'}
-    {'filetype_regex': '\%(vim)$', 'names': ['reload', 'vim-dev-plugin']}
-
-Such vim-scripts file can be read by VAM as well like this:
-
-    call vam#Scripts(expand('~/.vim-scripts'), {})
-
-Create a default.nix file:
-
-    { nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }:
-    nixpkgs.vim_configurable.customize { name = "vim"; vimrcConfig.vam.pluginDictionaries = [ "vim-addon-vim2nix" ]; }
-
-Create a generate.vim file:
-
-    ActivateAddons vim-addon-vim2nix
-    let vim_scripts = "vim-scripts"
-    call nix#ExportPluginsForNix({
-    \  'path_to_nixpkgs': eval('{"'.substitute(substitute(substitute($NIX_PATH, ':', ',', 'g'), '=',':', 'g'), '\([:,]\)', '"\1"',"g").'"}')["nixpkgs"],
-    \  'cache_file': '/tmp/vim2nix-cache',
-    \  'try_catch': 0,
-    \  'plugin_dictionaries': ["vim-addon-manager"]+map(readfile(vim_scripts), 'eval(v:val)')
-    \ })
-
-Then run
-
-    nix-shell -p vimUtils.vim_with_vim2nix --command "vim -c 'source generate.vim'"
-
-You should get a Vim buffer with the nix derivations (output1) and vam.pluginDictionaries (output2).
-You can add your vim to your system's configuration file like this and start it by "vim-my":
-
-    my-vim =
-     let plugins = let inherit (vimUtils) buildVimPluginFrom2Nix; in {
-          copy paste output1 here
-     }; in vim_configurable.customize {
-       name = "vim-my";
-
-       vimrcConfig.vam.knownPlugins = plugins; # optional
-       vimrcConfig.vam.pluginDictionaries = [
-          copy paste output2 here
-       ];
-
-       # Pathogen would be
-       # vimrcConfig.pathogen.knownPlugins = plugins; # plugins
-       # vimrcConfig.pathogen.pluginNames = ["tlib"];
-     };
-
-
-Sample output1:
-
-    "reload" = buildVimPluginFrom2Nix { # created by nix#NixDerivation
-      name = "reload";
-      src = fetchgit {
-        url = "git://github.com/xolox/vim-reload";
-        rev = "0a601a668727f5b675cb1ddc19f6861f3f7ab9e1";
-        sha256 = "0vb832l9yxj919f5hfg6qj6bn9ni57gnjd3bj7zpq7d4iv2s4wdh";
-      };
-      dependencies = ["nim-misc"];
-
-    };
-    [...]
-
-Sample output2:
-
-    [
-      ''vim-addon-manager''
-      ''tlib''
-      { "name" = ''vim-addon-sql''; }
-      { "filetype_regex" = ''\%(vim)$$''; "names" = [ ''reload'' ''vim-dev-plugin'' ]; }
-    ]
-
-
-## Important repositories
-
- [vim-pi](https://bitbucket.org/vimcommunity/vim-pi) is a plugin repository
-  from VAM plugin manager meant to be used by others as well used by
-
- [vim2nix](http://github.com/MarcWeber/vim-addon-vim2nix) which generates the
-  .nix code
-
--- a/doc/lib-function-locations.nix
+++ b/doc/lib-function-locations.nix
@@ -1,85 +0,0 @@
-{ pkgs ? (import ./.. { }), nixpkgs ? { }}:
-let
-  revision = pkgs.lib.trivial.revisionWithDefault (nixpkgs.revision or "master");
-
-  libDefPos = set:
-    builtins.map
-      (name: {
-        name = name;
-        location = builtins.unsafeGetAttrPos name set;
-      })
-      (builtins.attrNames set);
-
-  libset = toplib:
-    builtins.map
-      (subsetname: {
-        subsetname = subsetname;
-        functions = libDefPos toplib."${subsetname}";
-      })
-      (builtins.filter
-        (name: builtins.isAttrs toplib."${name}")
-        (builtins.attrNames toplib));
-
-  nixpkgsLib = pkgs.lib;
-
-  flattenedLibSubset = { subsetname, functions }:
-  builtins.map
-    (fn: {
-      name = "lib.${subsetname}.${fn.name}";
-      value = fn.location;
-    })
-    functions;
-
-  locatedlibsets = libs: builtins.map flattenedLibSubset (libset libs);
-  removeFilenamePrefix = prefix: filename:
-    let
-    prefixLen = (builtins.stringLength prefix) + 1; # +1 to remove the leading /
-      filenameLen = builtins.stringLength filename;
-      substr = builtins.substring prefixLen filenameLen filename;
-      in substr;
-
-  removeNixpkgs = removeFilenamePrefix (builtins.toString pkgs.path);
-
-  liblocations =
-    builtins.filter
-      (elem: elem.value != null)
-      (nixpkgsLib.lists.flatten
-        (locatedlibsets nixpkgsLib));
-
-  fnLocationRelative = { name, value }:
-    {
-      inherit name;
-      value = value // { file = removeNixpkgs value.file; };
-    };
-
-  relativeLocs = (builtins.map fnLocationRelative liblocations);
-  sanitizeId = builtins.replaceStrings
-    [ "'"      ]
-    [ "-prime" ];
-
-  urlPrefix = "https://github.com/NixOS/nixpkgs/blob/${revision}";
-  xmlstrings = (nixpkgsLib.strings.concatMapStrings
-      ({ name, value }:
-      ''
-      <section><title>${name}</title>
-        <para xml:id="${sanitizeId name}">
-        Located at
-        <link
-          xlink:href="${urlPrefix}/${value.file}#L${builtins.toString value.line}">${value.file}:${builtins.toString value.line}</link>
-        in  <literal>&lt;nixpkgs&gt;</literal>.
-        </para>
-        </section>
-      '')
-      relativeLocs);
-
-in pkgs.writeText
-    "locations.xml"
-    ''
-    <section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         version="5">
-         <title>All the locations for every lib function</title>
-         <para>This file is only for inclusion by other files.</para>
-         ${xmlstrings}
-    </section>
-    ''
--- a/doc/manual.xml
+++ b/doc/manual.xml
@@ -1,24 +1,26 @@
 <book xmlns="http://docbook.org/ns/docbook"
      xmlns:xi="http://www.w3.org/2001/XInclude">
- <info>
-  <title>Nixpkgs Contributors Guide</title>
-  <subtitle>Version <xi:include href=".version" parse="text" />
-  </subtitle>
- </info>
- <xi:include href="introduction.chapter.xml" />
- <xi:include href="quick-start.xml" />
- <xi:include href="stdenv.xml" />
- <xi:include href="multiple-output.xml" />
- <xi:include href="cross-compilation.xml" />
- <xi:include href="configuration.xml" />
- <xi:include href="functions.xml" />
- <xi:include href="meta.xml" />
- <xi:include href="languages-frameworks/index.xml" />
- <xi:include href="platform-notes.xml" />
- <xi:include href="package-notes.xml" />
- <xi:include href="overlays.xml" />
- <xi:include href="coding-conventions.xml" />
- <xi:include href="submitting-changes.xml" />
- <xi:include href="reviewing-contributions.xml" />
- <xi:include href="contributing.xml" />
+
+  <info>
+
+    <title>Nixpkgs Contributors Guide</title>
+
+    <subtitle>Version <xi:include href=".version" parse="text" /></subtitle>
+
+  </info>
+
+  <xi:include href="introduction.xml" />
+  <xi:include href="quick-start.xml" />
+  <xi:include href="stdenv.xml" />
+  <xi:include href="configuration.xml" />
+  <xi:include href="functions.xml" />
+  <xi:include href="meta.xml" />
+  <xi:include href="languages-frameworks/index.xml" />
+  <xi:include href="package-notes.xml" />
+  <xi:include href="coding-conventions.xml" />
+  <xi:include href="submitting-changes.xml" />
+  <xi:include href="haskell-users-guide.xml" />
+  <xi:include href="erlang-users-guide.xml" />
+  <xi:include href="contributing.xml" />
+
 </book>
--- a/doc/meta.xml
+++ b/doc/meta.xml
@@ -1,34 +1,37 @@
 <chapter xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="chap-meta">
- <title>Meta-attributes</title>
- <para>
-  Nix packages can declare <emphasis>meta-attributes</emphasis> that contain
-  information about a package such as a description, its homepage, its license,
-  and so on. For instance, the GNU Hello package has a <varname>meta</varname>
-  declaration like this:
+
+<title>Meta-attributes</title>
+
+<para>Nix packages can declare <emphasis>meta-attributes</emphasis>
+that contain information about a package such as a description, its
+homepage, its license, and so on.  For instance, the GNU Hello package
+has a <varname>meta</varname> declaration like this:
+
 <programlisting>
-meta = with stdenv.lib; {
+meta = {
  description = "A program that produces a familiar, friendly greeting";
  longDescription = ''
    GNU Hello is a program that prints "Hello, world!" when you run it.
    It is fully customizable.
  '';
  homepage = http://www.gnu.org/software/hello/manual/;
-  license = licenses.gpl3Plus;
-  maintainers = [ maintainers.eelco ];
-  platforms = platforms.all;
+  license = stdenv.lib.licenses.gpl3Plus;
+  maintainers = [ stdenv.lib.maintainers.eelco ];
+  platforms = stdenv.lib.platforms.all;
 };
 </programlisting>
- </para>
- <para>
-  Meta-attributes are not passed to the builder of the package. Thus, a change
-  to a meta-attribute doesn’t trigger a recompilation of the package. The
-  value of a meta-attribute must be a string.
- </para>
- <para>
-  The meta-attributes of a package can be queried from the command-line using
-  <command>nix-env</command>:
+
+</para>
+
+<para>Meta-attributes are not passed to the builder of the package.
+Thus, a change to a meta-attribute doesn’t trigger a recompilation of
+the package.  The value of a meta-attribute must be a string.</para>
+
+<para>The meta-attributes of a package can be queried from the
+command-line using <command>nix-env</command>:
+
 <screen>
 $ nix-env -qa hello --json
 {
@@ -50,7 +53,7 @@ $ nix-env -qa hello --json
                "x86_64-linux",
                "armv5tel-linux",
                "armv7l-linux",
-                "mips32-linux",
+                "mips64el-linux",
                "x86_64-darwin",
                "i686-cygwin",
                "i686-freebsd",
@@ -67,311 +70,254 @@ $ nix-env -qa hello --json


 </screen>
-  <command>nix-env</command> knows about the <varname>description</varname>
-  field specifically:
+
+<command>nix-env</command> knows about the
+<varname>description</varname> field specifically:
+
 <screen>
 $ nix-env -qa hello --description
 hello-2.3  A program that produces a familiar, friendly greeting
 </screen>
- </para>
- <section xml:id="sec-standard-meta-attributes">
-  <title>Standard meta-attributes</title>

-  <para>
-   It is expected that each meta-attribute is one of the following:
-  </para>
+</para>
+
+
+<section xml:id="sec-standard-meta-attributes"><title>Standard
+meta-attributes</title>
+
+<para>It is expected that each meta-attribute is one of the following:</para>
+
+<variablelist>
+
+  <varlistentry>
+    <term><varname>description</varname></term>
+    <listitem><para>A short (one-line) description of the package.
+    This is shown by <command>nix-env -q --description</command> and
+    also on the Nixpkgs release pages.</para>
+
+    <para>Don’t include a period at the end.  Don’t include newline
+    characters.  Capitalise the first character.  For brevity, don’t
+    repeat the name of package — just describe what it does.</para>
+
+    <para>Wrong: <literal>"libpng is a library that allows you to decode PNG images."</literal></para>
+
+    <para>Right: <literal>"A library for decoding PNG images"</literal></para>

-  <variablelist>
-   <varlistentry>
-    <term>
-     <varname>description</varname>
-    </term>
-    <listitem>
-     <para>
-      A short (one-line) description of the package. This is shown by
-      <command>nix-env -q --description</command> and also on the Nixpkgs
-      release pages.
-     </para>
-     <para>
-      Don’t include a period at the end. Don’t include newline characters.
-      Capitalise the first character. For brevity, don’t repeat the name of
-      package — just describe what it does.
-     </para>
-     <para>
-      Wrong: <literal>"libpng is a library that allows you to decode PNG
-      images."</literal>
-     </para>
-     <para>
-      Right: <literal>"A library for decoding PNG images"</literal>
-     </para>
    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>longDescription</varname>
-    </term>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>longDescription</varname></term>
+    <listitem><para>An arbitrarily long description of the
+    package.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>branch</varname></term>
+    <listitem><para>Release branch. Used to specify that a package is not
+    going to receive updates that are not in this branch; for example, Linux
+    kernel 3.0 is supposed to be updated to 3.0.X, not 3.1.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>homepage</varname></term>
+    <listitem><para>The package’s homepage.  Example:
+    <literal>http://www.gnu.org/software/hello/manual/</literal></para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>downloadPage</varname></term>
+    <listitem><para>The page where a link to the current version can be found.  Example:
+    <literal>http://ftp.gnu.org/gnu/hello/</literal></para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>license</varname></term>
    <listitem>
-     <para>
-      An arbitrarily long description of the package.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>branch</varname>
-    </term>
-    <listitem>
-     <para>
-      Release branch. Used to specify that a package is not going to receive
-      updates that are not in this branch; for example, Linux kernel 3.0 is
-      supposed to be updated to 3.0.X, not 3.1.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>homepage</varname>
-    </term>
-    <listitem>
-     <para>
-      The package’s homepage. Example:
-      <literal>http://www.gnu.org/software/hello/manual/</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>downloadPage</varname>
-    </term>
-    <listitem>
-     <para>
-      The page where a link to the current version can be found. Example:
-      <literal>http://ftp.gnu.org/gnu/hello/</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>license</varname>
-    </term>
-    <listitem>
-     <para>
-      The license, or licenses, for the package. One from the attribute set
-      defined in
-      <link
+      <para>
+        The license, or licenses, for the package. One from the attribute set
+        defined in <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/lib/licenses.nix">
-      <filename>nixpkgs/lib/licenses.nix</filename></link>. At this moment
-      using both a list of licenses and a single license is valid. If the
-      license field is in the form of a list representation, then it means that
-      parts of the package are licensed differently. Each license should
-      preferably be referenced by their attribute. The non-list attribute value
-      can also be a space delimited string representation of the contained
-      attribute shortNames or spdxIds. The following are all valid examples:
-      <itemizedlist>
-       <listitem>
-        <para>
-         Single license referenced by attribute (preferred)
-         <literal>stdenv.lib.licenses.gpl3</literal>.
-        </para>
-       </listitem>
-       <listitem>
-        <para>
-         Single license referenced by its attribute shortName (frowned upon)
-         <literal>"gpl3"</literal>.
-        </para>
-       </listitem>
-       <listitem>
-        <para>
-         Single license referenced by its attribute spdxId (frowned upon)
-         <literal>"GPL-3.0"</literal>.
-        </para>
-       </listitem>
-       <listitem>
-        <para>
-         Multiple licenses referenced by attribute (preferred) <literal>with
-         stdenv.lib.licenses; [ asl20 free ofl ]</literal>.
-        </para>
-       </listitem>
-       <listitem>
-        <para>
-         Multiple licenses referenced as a space delimited string of attribute
-         shortNames (frowned upon) <literal>"asl20 free ofl"</literal>.
-        </para>
-       </listitem>
-      </itemizedlist>
-      For details, see <xref linkend='sec-meta-license'/>.
-     </para>
+          <filename>nixpkgs/lib/licenses.nix</filename></link>. At this moment
+        using both a list of licenses and a single license is valid. If the
+        license field is in the form of a list representation, then it means
+        that parts of the package are licensed differently.  Each license
+        should preferably be referenced by their attribute. The non-list
+        attribute value can also be a space delimited string representation of
+        the contained attribute shortNames or spdxIds. The following are all valid
+        examples:
+        <itemizedlist>
+          <listitem><para>Single license referenced by attribute (preferred)
+              <literal>stdenv.lib.licenses.gpl3</literal>.
+          </para></listitem>
+          <listitem><para>Single license referenced by its attribute shortName (frowned upon)
+              <literal>"gpl3"</literal>.
+          </para></listitem>
+          <listitem><para>Single license referenced by its attribute spdxId (frowned upon)
+              <literal>"GPL-3.0"</literal>.
+          </para></listitem>
+          <listitem><para>Multiple licenses referenced by attribute (preferred)
+              <literal>with stdenv.lib.licenses; [ asl20 free ofl ]</literal>.
+          </para></listitem>
+          <listitem><para>Multiple licenses referenced as a space delimited string of attribute shortNames (frowned upon)
+              <literal>"asl20 free ofl"</literal>.
+          </para></listitem>
+        </itemizedlist>
+        For details, see <xref linkend='sec-meta-license'/>.
+      </para>
    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>maintainers</varname>
-    </term>
-    <listitem>
-     <para>
-      A list of names and e-mail addresses of the maintainers of this Nix
-      expression. If you would like to be a maintainer of a package, you may
-      want to add yourself to
-      <link
-    xlink:href="https://github.com/NixOS/nixpkgs/blob/master/maintainers/maintainer-list.nix"><filename>nixpkgs/maintainers/maintainer-list.nix</filename></link>
-      and write something like <literal>[ stdenv.lib.maintainers.alice
-      stdenv.lib.maintainers.bob ]</literal>.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>priority</varname>
-    </term>
-    <listitem>
-     <para>
-      The <emphasis>priority</emphasis> of the package, used by
-      <command>nix-env</command> to resolve file name conflicts between
-      packages. See the Nix manual page for <command>nix-env</command> for
-      details. Example: <literal>"10"</literal> (a low-priority package).
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>platforms</varname>
-    </term>
-    <listitem>
-     <para>
-      The list of Nix platform types on which the package is supported. Hydra
-      builds packages according to the platform specified. If no platform is
-      specified, the package does not have prebuilt binaries. An example is:
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>maintainers</varname></term>
+    <listitem><para>A list of names and e-mail addresses of the
+    maintainers of this Nix expression. If
+    you would like to be a maintainer of a package, you may want to add
+    yourself to <link
+    xlink:href="https://github.com/NixOS/nixpkgs/blob/master/lib/maintainers.nix"><filename>nixpkgs/lib/maintainers.nix</filename></link>
+    and write something like <literal>[ stdenv.lib.maintainers.alice
+    stdenv.lib.maintainers.bob ]</literal>.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>priority</varname></term>
+    <listitem><para>The <emphasis>priority</emphasis> of the package,
+    used by <command>nix-env</command> to resolve file name conflicts
+    between packages.  See the Nix manual page for
+    <command>nix-env</command> for details.  Example:
+    <literal>"10"</literal> (a low-priority
+    package).</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>platforms</varname></term>
+    <listitem><para>The list of Nix platform types on which the
+    package is supported. Hydra builds packages according to the
+    platform specified. If no platform is specified, the package does
+    not have prebuilt binaries. An example is:
+
 <programlisting>
 meta.platforms = stdenv.lib.platforms.linux;
 </programlisting>
-      Attribute Set <varname>stdenv.lib.platforms</varname> defines
-      <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/lib/systems/doubles.nix">
-      various common lists</link> of platforms types.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>hydraPlatforms</varname>
-    </term>
-    <listitem>
-     <para>
-      The list of Nix platform types for which the Hydra instance at
-      <literal>hydra.nixos.org</literal> will build the package. (Hydra is the
-      Nix-based continuous build system.) It defaults to the value of
-      <varname>meta.platforms</varname>. Thus, the only reason to set
-      <varname>meta.hydraPlatforms</varname> is if you want
-      <literal>hydra.nixos.org</literal> to build the package on a subset of
-      <varname>meta.platforms</varname>, or not at all, e.g.
+
+    Attribute Set <varname>stdenv.lib.platforms</varname> in
+    <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/lib/platforms.nix">
+    <filename>nixpkgs/lib/platforms.nix</filename></link> defines various common
+    lists of platforms types.
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>hydraPlatforms</varname></term>
+    <listitem><para>The list of Nix platform types for which the Hydra
+    instance at <literal>hydra.nixos.org</literal> will build the
+    package.  (Hydra is the Nix-based continuous build system.)  It
+    defaults to the value of <varname>meta.platforms</varname>.  Thus,
+    the only reason to set <varname>meta.hydraPlatforms</varname> is
+    if you want <literal>hydra.nixos.org</literal> to build the
+    package on a subset of <varname>meta.platforms</varname>, or not
+    at all, e.g.
+
 <programlisting>
 meta.platforms = stdenv.lib.platforms.linux;
 meta.hydraPlatforms = [];
 </programlisting>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>broken</varname>
-    </term>
-    <listitem>
-     <para>
-      If set to <literal>true</literal>, the package is marked as “broken”,
-      meaning that it won’t show up in <literal>nix-env -qa</literal>, and
-      cannot be built or installed. Such packages should be removed from
-      Nixpkgs eventually unless they are fixed.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>updateWalker</varname>
-    </term>
-    <listitem>
-     <para>
-      If set to <literal>true</literal>, the package is tested to be updated
-      correctly by the <literal>update-walker.sh</literal> script without
-      additional settings. Such packages have <varname>meta.version</varname>
-      set and their homepage (or the page specified by
-      <varname>meta.downloadPage</varname>) contains a direct link to the
-      package tarball.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
- </section>
- <section xml:id="sec-meta-license">
-  <title>Licenses</title>

-  <para>
-   The <varname>meta.license</varname> attribute should preferrably contain a
-   value from <varname>stdenv.lib.licenses</varname> defined in
-   <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/lib/licenses.nix">
-   <filename>nixpkgs/lib/licenses.nix</filename></link>, or in-place license
-   description of the same format if the license is unlikely to be useful in
-   another expression.
-  </para>
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>broken</varname></term>
+    <listitem><para>If set to <literal>true</literal>, the package is
+    marked as “broken”, meaning that it won’t show up in
+    <literal>nix-env -qa</literal>, and cannot be built or installed.
+    Such packages should be removed from Nixpkgs eventually unless
+    they are fixed.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>updateWalker</varname></term>
+    <listitem><para>If set to <literal>true</literal>, the package is
+    tested to be updated correctly by the <literal>update-walker.sh</literal>
+    script without additional settings. Such packages have
+    <varname>meta.version</varname> set and their homepage (or
+    the page specified by <varname>meta.downloadPage</varname>) contains
+    a direct link to the package tarball.</para></listitem>
+  </varlistentry>
+
+</variablelist>
+
+
+</section>
+
+
+<section xml:id="sec-meta-license"><title>Licenses</title>
+
+<para>The <varname>meta.license</varname> attribute should preferrably contain
+a value from <varname>stdenv.lib.licenses</varname> defined in
+<link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/lib/licenses.nix">
+<filename>nixpkgs/lib/licenses.nix</filename></link>,
+or in-place license description of the same format if the license is
+unlikely to be useful in another expression.</para>
+
+<para>Although it's typically better to indicate the specific license,
+a few generic options are available:
+
+<variablelist>
+
+  <varlistentry>
+    <term><varname>stdenv.lib.licenses.free</varname>,
+    <varname>"free"</varname></term>
+
+    <listitem><para>Catch-all for free software licenses not listed
+    above.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>stdenv.lib.licenses.unfreeRedistributable</varname>,
+    <varname>"unfree-redistributable"</varname></term>
+
+    <listitem><para>Unfree package that can be redistributed in binary
+    form. That is, it’s legal to redistribute the
+    <emphasis>output</emphasis> of the derivation.  This means that
+    the package can be included in the Nixpkgs
+    channel.</para>
+
+    <para>Sometimes proprietary software can only be redistributed
+    unmodified. Make sure the builder doesn’t actually modify the
+    original binaries; otherwise we’re breaking the license.  For
+    instance, the NVIDIA X11 drivers can be redistributed unmodified,
+    but our builder applies <command>patchelf</command> to make them
+    work. Thus, its license is <varname>"unfree"</varname> and it
+    cannot be included in the Nixpkgs channel.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>stdenv.lib.licenses.unfree</varname>,
+    <varname>"unfree"</varname></term>
+
+    <listitem><para>Unfree package that cannot be redistributed. You
+    can build it yourself, but you cannot redistribute the output of
+    the derivation. Thus it cannot be included in the Nixpkgs
+    channel.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>stdenv.lib.licenses.unfreeRedistributableFirmware</varname>,
+    <varname>"unfree-redistributable-firmware"</varname></term>
+
+    <listitem><para>This package supplies unfree, redistributable
+    firmware.  This is a separate value from
+    <varname>unfree-redistributable</varname> because not everybody
+    cares whether firmware is free.</para></listitem>
+  </varlistentry>
+
+</variablelist>
+
+</para>
+
+
+</section>
+

-  <para>
-   Although it's typically better to indicate the specific license, a few
-   generic options are available:
-   <variablelist>
-    <varlistentry>
-     <term>
-      <varname>stdenv.lib.licenses.free</varname>, <varname>"free"</varname>
-     </term>
-     <listitem>
-      <para>
-       Catch-all for free software licenses not listed above.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>stdenv.lib.licenses.unfreeRedistributable</varname>, <varname>"unfree-redistributable"</varname>
-     </term>
-     <listitem>
-      <para>
-       Unfree package that can be redistributed in binary form. That is, it’s
-       legal to redistribute the <emphasis>output</emphasis> of the derivation.
-       This means that the package can be included in the Nixpkgs channel.
-      </para>
-      <para>
-       Sometimes proprietary software can only be redistributed unmodified.
-       Make sure the builder doesn’t actually modify the original binaries;
-       otherwise we’re breaking the license. For instance, the NVIDIA X11
-       drivers can be redistributed unmodified, but our builder applies
-       <command>patchelf</command> to make them work. Thus, its license is
-       <varname>"unfree"</varname> and it cannot be included in the Nixpkgs
-       channel.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>stdenv.lib.licenses.unfree</varname>, <varname>"unfree"</varname>
-     </term>
-     <listitem>
-      <para>
-       Unfree package that cannot be redistributed. You can build it yourself,
-       but you cannot redistribute the output of the derivation. Thus it cannot
-       be included in the Nixpkgs channel.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname>stdenv.lib.licenses.unfreeRedistributableFirmware</varname>, <varname>"unfree-redistributable-firmware"</varname>
-     </term>
-     <listitem>
-      <para>
-       This package supplies unfree, redistributable firmware. This is a
-       separate value from <varname>unfree-redistributable</varname> because
-       not everybody cares whether firmware is free.
-      </para>
-     </listitem>
-    </varlistentry>
-   </variablelist>
-  </para>
- </section>
 </chapter>
--- a/doc/multiple-output.xml
+++ b/doc/multiple-output.xml
@@ -1,323 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter [
-  <!ENTITY ndash "&#x2013;"> <!-- @vcunat likes to use this one ;-) -->
-]>
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="chap-multiple-output">
- <title>Multiple-output packages</title>
- <section xml:id="sec-multiple-outputs-introduction">
-  <title>Introduction</title>
-
-  <para>
-   The Nix language allows a derivation to produce multiple outputs, which is
-   similar to what is utilized by other Linux distribution packaging systems.
-   The outputs reside in separate nix store paths, so they can be mostly
-   handled independently of each other, including passing to build inputs,
-   garbage collection or binary substitution. The exception is that building
-   from source always produces all the outputs.
-  </para>
-
-  <para>
-   The main motivation is to save disk space by reducing runtime closure sizes;
-   consequently also sizes of substituted binaries get reduced. Splitting can
-   be used to have more granular runtime dependencies, for example the typical
-   reduction is to split away development-only files, as those are typically
-   not needed during runtime. As a result, closure sizes of many packages can
-   get reduced to a half or even much less.
-  </para>
-
-  <note>
-   <para>
-    The reduction effects could be instead achieved by building the parts in
-    completely separate derivations. That would often additionally reduce
-    build-time closures, but it tends to be much harder to write such
-    derivations, as build systems typically assume all parts are being built at
-    once. This compromise approach of single source package producing multiple
-    binary packages is also utilized often by rpm and deb.
-   </para>
-  </note>
- </section>
- <section xml:id="sec-multiple-outputs-installing">
-  <title>Installing a split package</title>
-
-  <para>
-   When installing a package via <varname>systemPackages</varname> or
-   <command>nix-env</command> you have several options:
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     You can install particular outputs explicitly, as each is available in the
-     Nix language as an attribute of the package. The
-     <varname>outputs</varname> attribute contains a list of output names.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     You can let it use the default outputs. These are handled by
-     <varname>meta.outputsToInstall</varname> attribute that contains a list of
-     output names.
-    </para>
-    <para>
-     TODO: more about tweaking the attribute, etc.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     NixOS provides configuration option
-     <varname>environment.extraOutputsToInstall</varname> that allows adding
-     extra outputs of <varname>environment.systemPackages</varname> atop the
-     default ones. It's mainly meant for documentation and debug symbols, and
-     it's also modified by specific options.
-    </para>
-    <note>
-     <para>
-      At this moment there is no similar configurability for packages installed
-      by <command>nix-env</command>. You can still use approach from
-      <xref linkend="sec-modify-via-packageOverrides" /> to override
-      <varname>meta.outputsToInstall</varname> attributes, but that's a rather
-      inconvenient way.
-     </para>
-    </note>
-   </listitem>
-  </itemizedlist>
- </section>
- <section xml:id="sec-multiple-outputs-using-split-packages">
-  <title>Using a split package</title>
-
-  <para>
-   In the Nix language the individual outputs can be reached explicitly as
-   attributes, e.g. <varname>coreutils.info</varname>, but the typical case is
-   just using packages as build inputs.
-  </para>
-
-  <para>
-   When a multiple-output derivation gets into a build input of another
-   derivation, the <varname>dev</varname> output is added if it exists,
-   otherwise the first output is added. In addition to that,
-   <varname>propagatedBuildOutputs</varname> of that package which by default
-   contain <varname>$outputBin</varname> and <varname>$outputLib</varname> are
-   also added. (See <xref linkend="multiple-output-file-type-groups" />.)
-  </para>
- </section>
- <section xml:id="sec-multiple-outputs-">
-  <title>Writing a split derivation</title>
-
-  <para>
-   Here you find how to write a derivation that produces multiple outputs.
-  </para>
-
-  <para>
-   In nixpkgs there is a framework supporting multiple-output derivations. It
-   tries to cover most cases by default behavior. You can find the source
-   separated in
-   &lt;<filename>nixpkgs/pkgs/build-support/setup-hooks/multiple-outputs.sh</filename>&gt;;
-   it's relatively well-readable. The whole machinery is triggered by defining
-   the <varname>outputs</varname> attribute to contain the list of desired
-   output names (strings).
-  </para>
-
-<programlisting>outputs = [ "bin" "dev" "out" "doc" ];</programlisting>
-
-  <para>
-   Often such a single line is enough. For each output an equally named
-   environment variable is passed to the builder and contains the path in nix
-   store for that output. Typically you also want to have the main
-   <varname>out</varname> output, as it catches any files that didn't get
-   elsewhere.
-  </para>
-
-  <note>
-   <para>
-    There is a special handling of the <varname>debug</varname> output,
-    described at <xref linkend="stdenv-separateDebugInfo" />.
-   </para>
-  </note>
-
-  <section xml:id="multiple-output-file-binaries-first-convention">
-   <title><quote>Binaries first</quote></title>
-
-   <para>
-    A commonly adopted convention in <literal>nixpkgs</literal> is that
-    executables provided by the package are contained within its first output.
-    This convention allows the dependent packages to reference the executables
-    provided by packages in a uniform manner. For instance, provided with the
-    knowledge that the <literal>perl</literal> package contains a
-    <literal>perl</literal> executable it can be referenced as
-    <literal>${pkgs.perl}/bin/perl</literal> within a Nix derivation that needs
-    to execute a Perl script.
-   </para>
-
-   <para>
-    The <literal>glibc</literal> package is a deliberate single exception to
-    the <quote>binaries first</quote> convention. The <literal>glibc</literal>
-    has <literal>libs</literal> as its first output allowing the libraries
-    provided by <literal>glibc</literal> to be referenced directly (e.g.
-    <literal>${stdenv.glibc}/lib/ld-linux-x86-64.so.2</literal>). The
-    executables provided by <literal>glibc</literal> can be accessed via its
-    <literal>bin</literal> attribute (e.g.
-    <literal>${stdenv.glibc.bin}/bin/ldd</literal>).
-   </para>
-
-   <para>
-    The reason for why <literal>glibc</literal> deviates from the convention is
-    because referencing a library provided by <literal>glibc</literal> is a
-    very common operation among Nix packages. For instance, third-party
-    executables packaged by Nix are typically patched and relinked with the
-    relevant version of <literal>glibc</literal> libraries from Nix packages
-    (please see the documentation on
-    <link xlink:href="https://nixos.org/patchelf.html">patchelf</link> for more
-    details).
-   </para>
-  </section>
-
-  <section xml:id="multiple-output-file-type-groups">
-   <title>File type groups</title>
-
-   <para>
-    The support code currently recognizes some particular kinds of outputs and
-    either instructs the build system of the package to put files into their
-    desired outputs or it moves the files during the fixup phase. Each group of
-    file types has an <varname>outputFoo</varname> variable specifying the
-    output name where they should go. If that variable isn't defined by the
-    derivation writer, it is guessed &ndash; a default output name is defined,
-    falling back to other possibilities if the output isn't defined.
-   </para>
-
-   <variablelist>
-    <varlistentry>
-     <term>
-      <varname> $outputDev</varname>
-     </term>
-     <listitem>
-      <para>
-       is for development-only files. These include C(++) headers, pkg-config,
-       cmake and aclocal files. They go to <varname>dev</varname> or
-       <varname>out</varname> by default.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname> $outputBin</varname>
-     </term>
-     <listitem>
-      <para>
-       is meant for user-facing binaries, typically residing in bin/. They go
-       to <varname>bin</varname> or <varname>out</varname> by default.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname> $outputLib</varname>
-     </term>
-     <listitem>
-      <para>
-       is meant for libraries, typically residing in <filename>lib/</filename>
-       and <filename>libexec/</filename>. They go to <varname>lib</varname> or
-       <varname>out</varname> by default.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname> $outputDoc</varname>
-     </term>
-     <listitem>
-      <para>
-       is for user documentation, typically residing in
-       <filename>share/doc/</filename>. It goes to <varname>doc</varname> or
-       <varname>out</varname> by default.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname> $outputDevdoc</varname>
-     </term>
-     <listitem>
-      <para>
-       is for <emphasis>developer</emphasis> documentation. Currently we count
-       gtk-doc and devhelp books in there. It goes to <varname>devdoc</varname>
-       or is removed (!) by default. This is because e.g. gtk-doc tends to be
-       rather large and completely unused by nixpkgs users.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname> $outputMan</varname>
-     </term>
-     <listitem>
-      <para>
-       is for man pages (except for section 3). They go to
-       <varname>man</varname> or <varname>$outputBin</varname> by default.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname> $outputDevman</varname>
-     </term>
-     <listitem>
-      <para>
-       is for section 3 man pages. They go to <varname>devman</varname> or
-       <varname>$outputMan</varname> by default.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <varname> $outputInfo</varname>
-     </term>
-     <listitem>
-      <para>
-       is for info pages. They go to <varname>info</varname> or
-       <varname>$outputBin</varname> by default.
-      </para>
-     </listitem>
-    </varlistentry>
-   </variablelist>
-  </section>
-
-  <section xml:id="sec-multiple-outputs-caveats">
-   <title>Common caveats</title>
-
-   <itemizedlist>
-    <listitem>
-     <para>
-      Some configure scripts don't like some of the parameters passed by
-      default by the framework, e.g. <literal>--docdir=/foo/bar</literal>. You
-      can disable this by setting <literal>setOutputFlags = false;</literal>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      The outputs of a single derivation can retain references to each other,
-      but note that circular references are not allowed. (And each
-      strongly-connected component would act as a single output anyway.)
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Most of split packages contain their core functionality in libraries.
-      These libraries tend to refer to various kind of data that typically gets
-      into <varname>out</varname>, e.g. locale strings, so there is often no
-      advantage in separating the libraries into <varname>lib</varname>, as
-      keeping them in <varname>out</varname> is easier.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Some packages have hidden assumptions on install paths, which complicates
-      splitting.
-     </para>
-    </listitem>
-   </itemizedlist>
-  </section>
- </section>
-<!--Writing a split derivation-->
-</chapter>
--- a/doc/old/cross.txt
+++ b/doc/old/cross.txt
@@ -61,10 +61,10 @@ stdenv.mkDerivation {
  builder = ./builder.sh;
  src = fetchurl {
    url = http://ftp.nluug.nl/gnu/binutils/binutils-2.16.1.tar.bz2;
-    sha256 = "1ian3kwh2vg6hr3ymrv48s04gijs539vzrq62xr76bxbhbwnz2np";
+    md5 = "6a9d529efb285071dad10e1f3d2b2967";
  };
  inherit noSysDirs;
-  configureFlags = [ "--target=arm-linux" ];
+  configureFlags = "--target=arm-linux";
 }
 ---

@@ -78,14 +78,14 @@ Step 2: build kernel headers for the target architecture
 ---
 {stdenv, fetchurl}:

-assert stdenv.buildPlatform.system == "i686-linux";
+assert stdenv.system == "i686-linux";

 stdenv.mkDerivation {
-  name = "linux-headers-2.6.13.1-arm";
+  name = "linux-headers-2.6.13.4-arm";
  builder = ./builder.sh;
  src = fetchurl {
-    url = http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.13.1.tar.bz2;
-    sha256 = "12qxmc827fjhaz53kjy7vyrzsaqcg78amiqsb3qm20z26w705lma";
+    url = http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.13.4.tar.bz2;
+    md5 = "94768d7eef90a9d8174639b2a7d3f58d";
  };
 }
 ---
@@ -152,7 +152,9 @@ stdenv.mkDerivation {
  builder = ./builder.sh;
  src = fetchurl {
    url = ftp://ftp.nluug.nl/pub/gnu/gcc/gcc-4.0.2/gcc-core-4.0.2.tar.bz2;
-    sha256 = "02fxh0asflm8825w23l2jq1wvs7hbnam0jayrivg7zdv2ifnc0rc";
+    md5 = "f7781398ada62ba255486673e6274b26";
+    #url = ftp://ftp.nluug.nl/pub/gnu/gcc/gcc-4.0.2/gcc-4.0.2.tar.bz2;
+    #md5 = "a659b8388cac9db2b13e056e574ceeb0";
  };
  # !!! apply only if noSysDirs is set
  patches = [./no-sys-dirs.patch ./gcc-inhibit.patch];
--- a/doc/old/update-upstream-data.txt
+++ b/doc/old/update-upstream-data.txt
@@ -0,0 +1,14 @@
+Semi-automatic source information updating using "update-upstream-data.sh" script and "src-{,info-}for-*.nix"
+
+1. Recognizing when a pre-existing package uses this mechanism.
+
+Packages using this automatical update mechanism have src-info-for-default.nix and src-for-default.nix next to default.nix. src-info-for-default.nix describes getting the freshest source from upstream web site; src-for-default.nix is a generated file with the current data about used source. Both files define a simple attrSet. 
+
+src-info-for-default.nix (for a file grabbed via http) contains at least downloadPage attribute - it is the page we need to look at to find out the latest version. It also contains baseName that is used for automatical generation of package name containing version. It can contain extra data for trickier cases.
+
+src-for-default.nix will contain advertisedUrl (raw URL chosen on the site; its change prompts regeneration of source data), url for fetchurl, hash, version retrieved from the download URL and suggested package name.
+
+2. Updating a package
+
+nixpkgs/pkgs/build-support/upstream-updater directory contains some scripts. The worker script is called update-upstream-data.sh. This script requires main expression name (e.g. default.nix). It can optionally accpet a second parameter, URL which will be used instead of getting one by parsing the downloadPage (version extraction, mirror URL creation etc. will still be run). After running the script, check src-for-default.nix (or replace default.nix with expression name, if there are seceral expressions in the directory) for new version information.
+
--- a/doc/overlays.xml
+++ b/doc/overlays.xml
@@ -1,164 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="chap-overlays">
- <title>Overlays</title>
- <para>
-  This chapter describes how to extend and change Nixpkgs packages using
-  overlays. Overlays are used to add layers in the fix-point used by Nixpkgs to
-  compose the set of all packages.
- </para>
- <para>
-  Nixpkgs can be configured with a list of overlays, which are applied in
-  order. This means that the order of the overlays can be significant if
-  multiple layers override the same package.
- </para>
-<!--============================================================-->
- <section xml:id="sec-overlays-install">
-  <title>Installing overlays</title>
-
-  <para>
-   The list of overlays is determined as follows.
-  </para>
-
-  <para>
-   If the <varname>overlays</varname> argument is not provided explicitly, we
-   look for overlays in a path. The path is determined as follows:
-   <orderedlist>
-    <listitem>
-     <para>
-      First, if an <varname>overlays</varname> argument to the nixpkgs function
-      itself is given, then that is used.
-     </para>
-     <para>
-      This can be passed explicitly when importing nipxkgs, for example
-      <literal>import &lt;nixpkgs> { overlays = [ overlay1 overlay2 ];
-      }</literal>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Otherwise, if the Nix path entry <literal>&lt;nixpkgs-overlays></literal>
-      exists, we look for overlays at that path, as described below.
-     </para>
-     <para>
-      See the section on <literal>NIX_PATH</literal> in the Nix manual for more
-      details on how to set a value for
-      <literal>&lt;nixpkgs-overlays>.</literal>
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      If one of <filename>~/.config/nixpkgs/overlays.nix</filename> and
-      <filename>~/.config/nixpkgs/overlays/</filename> exists, then we look for
-      overlays at that path, as described below. It is an error if both exist.
-     </para>
-    </listitem>
-   </orderedlist>
-  </para>
-
-  <para>
-   If we are looking for overlays at a path, then there are two cases:
-   <itemizedlist>
-    <listitem>
-     <para>
-      If the path is a file, then the file is imported as a Nix expression and
-      used as the list of overlays.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      If the path is a directory, then we take the content of the directory,
-      order it lexicographically, and attempt to interpret each as an overlay
-      by:
-      <itemizedlist>
-       <listitem>
-        <para>
-         Importing the file, if it is a <literal>.nix</literal> file.
-        </para>
-       </listitem>
-       <listitem>
-        <para>
-         Importing a top-level <filename>default.nix</filename> file, if it is
-         a directory.
-        </para>
-       </listitem>
-      </itemizedlist>
-     </para>
-    </listitem>
-   </itemizedlist>
-  </para>
-
-  <para>
-   On a NixOS system the value of the <literal>nixpkgs.overlays</literal>
-   option, if present, is passed to the system Nixpkgs directly as an argument.
-   Note that this does not affect the overlays for non-NixOS operations (e.g.
-   <literal>nix-env</literal>), which are looked up independently.
-  </para>
-
-  <para>
-   The <filename>overlays.nix</filename> option therefore provides a convenient
-   way to use the same overlays for a NixOS system configuration and user
-   configuration: the same file can be used as
-   <filename>overlays.nix</filename> and imported as the value of
-   <literal>nixpkgs.overlays</literal>.
-  </para>
- </section>
-<!--============================================================-->
- <section xml:id="sec-overlays-definition">
-  <title>Defining overlays</title>
-
-  <para>
-   Overlays are Nix functions which accept two arguments, conventionally called
-   <varname>self</varname> and <varname>super</varname>, and return a set of
-   packages. For example, the following is a valid overlay.
-  </para>
-
-<programlisting>
-self: super:
-
-{
-  boost = super.boost.override {
-    python = self.python3;
-  };
-  rr = super.callPackage ./pkgs/rr {
-    stdenv = self.stdenv_32bit;
-  };
-}
-</programlisting>
-
-  <para>
-   The first argument (<varname>self</varname>) corresponds to the final
-   package set. You should use this set for the dependencies of all packages
-   specified in your overlay. For example, all the dependencies of
-   <varname>rr</varname> in the example above come from
-   <varname>self</varname>, as well as the overridden dependencies used in the
-   <varname>boost</varname> override.
-  </para>
-
-  <para>
-   The second argument (<varname>super</varname>) corresponds to the result of
-   the evaluation of the previous stages of Nixpkgs. It does not contain any of
-   the packages added by the current overlay, nor any of the following
-   overlays. This set should be used either to refer to packages you wish to
-   override, or to access functions defined in Nixpkgs. For example, the
-   original recipe of <varname>boost</varname> in the above example, comes from
-   <varname>super</varname>, as well as the <varname>callPackage</varname>
-   function.
-  </para>
-
-  <para>
-   The value returned by this function should be a set similar to
-   <filename>pkgs/top-level/all-packages.nix</filename>, containing overridden
-   and/or new packages.
-  </para>
-
-  <para>
-   Overlays are similar to other methods for customizing Nixpkgs, in particular
-   the <literal>packageOverrides</literal> attribute described in
-   <xref linkend="sec-modify-via-packageOverrides"/>. Indeed,
-   <literal>packageOverrides</literal> acts as an overlay with only the
-   <varname>super</varname> argument. It is therefore appropriate for basic
-   use, but overlays are more powerful and easier to distribute.
-  </para>
- </section>
-</chapter>
--- a/doc/overrides.css
+++ b/doc/overrides.css
@@ -1,9 +0,0 @@
-.docbook .xref img[src^=images\/callouts\/],
-.screen img,
-.programlisting img {
-    width: 1em;
-}
-
-.calloutlist img {
-    width: 1.5em;
-}
--- a/doc/package-notes.xml
+++ b/doc/package-notes.xml
--- a/doc/platform-notes.xml
+++ b/doc/platform-notes.xml
@@ -1,105 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="chap-platform-nodes">
- <title>Platform Notes</title>
- <section xml:id="sec-darwin">
-  <title>Darwin (macOS)</title>
-
-  <para>
-   Some common issues when packaging software for darwin:
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     The darwin <literal>stdenv</literal> uses clang instead of gcc. When
-     referring to the compiler <varname>$CC</varname> or <command>cc</command>
-     will work in both cases. Some builds hardcode gcc/g++ in their build
-     scripts, that can usually be fixed with using something like
-     <literal>makeFlags = [ "CC=cc" ];</literal> or by patching the build
-     scripts.
-    </para>
-<programlisting>
-      stdenv.mkDerivation {
-        name = "libfoo-1.2.3";
-        # ...
-        buildPhase = ''
-          $CC -o hello hello.c
-        '';
-      }
-    </programlisting>
-   </listitem>
-   <listitem>
-    <para>
-     On darwin libraries are linked using absolute paths, libraries are
-     resolved by their <literal>install_name</literal> at link time. Sometimes
-     packages won't set this correctly causing the library lookups to fail at
-     runtime. This can be fixed by adding extra linker flags or by running
-     <command>install_name_tool -id</command> during the
-     <function>fixupPhase</function>.
-    </para>
-<programlisting>
-      stdenv.mkDerivation {
-        name = "libfoo-1.2.3";
-        # ...
-        makeFlags = stdenv.lib.optional stdenv.isDarwin "LDFLAGS=-Wl,-install_name,$(out)/lib/libfoo.dylib";
-      }
-    </programlisting>
-   </listitem>
-   <listitem>
-    <para>
-     Even if the libraries are linked using absolute paths and resolved via
-     their <literal>install_name</literal> correctly, tests can sometimes fail
-     to run binaries. This happens because the <varname>checkPhase</varname>
-     runs before the libraries are installed.
-    </para>
-    <para>
-     This can usually be solved by running the tests after the
-     <varname>installPhase</varname> or alternatively by using
-     <varname>DYLD_LIBRARY_PATH</varname>. More information about this variable
-     can be found in the <citerefentry>
-     <refentrytitle>dyld</refentrytitle>
-     <manvolnum>1</manvolnum></citerefentry> manpage.
-    </para>
-<programlisting>
-      dyld: Library not loaded: /nix/store/7hnmbscpayxzxrixrgxvvlifzlxdsdir-jq-1.5-lib/lib/libjq.1.dylib
-      Referenced from: /private/tmp/nix-build-jq-1.5.drv-0/jq-1.5/tests/../jq
-      Reason: image not found
-      ./tests/jqtest: line 5: 75779 Abort trap: 6
-    </programlisting>
-<programlisting>
-      stdenv.mkDerivation {
-        name = "libfoo-1.2.3";
-        # ...
-        doInstallCheck = true;
-        installCheckTarget = "check";
-      }
-    </programlisting>
-   </listitem>
-   <listitem>
-    <para>
-     Some packages assume xcode is available and use <command>xcrun</command>
-     to resolve build tools like <command>clang</command>, etc. This causes
-     errors like <code>xcode-select: error: no developer tools were found at
-     '/Applications/Xcode.app'</code> while the build doesn't actually depend
-     on xcode.
-    </para>
-<programlisting>
-      stdenv.mkDerivation {
-        name = "libfoo-1.2.3";
-        # ...
-        prePatch = ''
-          substituteInPlace Makefile \
-              --replace '/usr/bin/xcrun clang' clang
-        '';
-      }
-    </programlisting>
-    <para>
-     The package <literal>xcbuild</literal> can be used to build projects that
-     really depend on Xcode, however projects that build some kind of graphical
-     interface won't work without using Xcode in an impure way.
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
-</chapter>
--- a/doc/quick-start.xml
+++ b/doc/quick-start.xml
@@ -1,219 +1,223 @@
 <chapter xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="chap-quick-start">
- <title>Quick Start to Adding a Package</title>
- <para>
-  To add a package to Nixpkgs:
-  <orderedlist>
-   <listitem>
-    <para>
-     Checkout the Nixpkgs source tree:
+
+<title>Quick Start to Adding a Package</title>
+
+<para>To add a package to Nixpkgs:
+
+<orderedlist>
+
+  <listitem>
+    <para>Checkout the Nixpkgs source tree:
+
 <screen>
-$ git clone https://github.com/NixOS/nixpkgs
+$ git clone git://github.com/NixOS/nixpkgs.git 
 $ cd nixpkgs</screen>
+
    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Find a good place in the Nixpkgs tree to add the Nix expression for your
-     package. For instance, a library package typically goes into
-     <filename>pkgs/development/libraries/<replaceable>pkgname</replaceable></filename>,
-     while a web browser goes into
-     <filename>pkgs/applications/networking/browsers/<replaceable>pkgname</replaceable></filename>.
-     See <xref linkend="sec-organisation" /> for some hints on the tree
-     organisation. Create a directory for your package, e.g.
+  </listitem>
+
+  <listitem>
+    <para>Find a good place in the Nixpkgs tree to add the Nix
+    expression for your package.  For instance, a library package
+    typically goes into
+    <filename>pkgs/development/libraries/<replaceable>pkgname</replaceable></filename>,
+    while a web browser goes into
+    <filename>pkgs/applications/networking/browsers/<replaceable>pkgname</replaceable></filename>.
+    See <xref linkend="sec-organisation" /> for some hints on the tree
+    organisation.  Create a directory for your package, e.g.
+
 <screen>
 $ mkdir pkgs/development/libraries/libfoo</screen>
+  
    </para>
-   </listitem>
-   <listitem>
-    <para>
-     In the package directory, create a Nix expression — a piece of code that
-     describes how to build the package. In this case, it should be a
-     <emphasis>function</emphasis> that is called with the package dependencies
-     as arguments, and returns a build of the package in the Nix store. The
-     expression should usually be called <filename>default.nix</filename>.
+  </listitem>
+
+  <listitem>
+    <para>In the package directory, create a Nix expression — a piece
+    of code that describes how to build the package.  In this case, it
+    should be a <emphasis>function</emphasis> that is called with the
+    package dependencies as arguments, and returns a build of the
+    package in the Nix store.  The expression should usually be called
+    <filename>default.nix</filename>.
+
 <screen>
 $ emacs pkgs/development/libraries/libfoo/default.nix
 $ git add pkgs/development/libraries/libfoo/default.nix</screen>
+
    </para>
-    <para>
-     You can have a look at the existing Nix expressions under
-     <filename>pkgs/</filename> to see how it’s done. Here are some good
-     ones:
-     <itemizedlist>
-      <listitem>
-       <para>
-        GNU Hello:
-        <link
+
+    <para>You can have a look at the existing Nix expressions under
+    <filename>pkgs/</filename> to see how it’s done.  Here are some
+    good ones:
+
+      <itemizedlist>
+
+        <listitem>
+          <para>GNU Hello: <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/misc/hello/default.nix"><filename>pkgs/applications/misc/hello/default.nix</filename></link>.
-        Trivial package, which specifies some <varname>meta</varname>
-        attributes which is good practice.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        GNU cpio:
-        <link
+          Trivial package, which specifies some <varname>meta</varname>
+          attributes which is good practice.</para>
+        </listitem>
+
+        <listitem>
+          <para>GNU cpio: <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/archivers/cpio/default.nix"><filename>pkgs/tools/archivers/cpio/default.nix</filename></link>.
-        Also a simple package. The generic builder in <varname>stdenv</varname>
-        does everything for you. It has no dependencies beyond
-        <varname>stdenv</varname>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        GNU Multiple Precision arithmetic library (GMP):
-        <link
+          Also a simple package. The generic builder in
+          <varname>stdenv</varname> does everything for you. It has
+          no dependencies beyond <varname>stdenv</varname>.</para>
+        </listitem>
+
+        <listitem>
+          <para>GNU Multiple Precision arithmetic library (GMP): <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/libraries/gmp/5.1.x.nix"><filename>pkgs/development/libraries/gmp/5.1.x.nix</filename></link>.
-        Also done by the generic builder, but has a dependency on
-        <varname>m4</varname>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Pan, a GTK-based newsreader:
-        <link
+          Also done by the generic builder, but has a dependency on
+          <varname>m4</varname>.</para>
+        </listitem>
+
+        <listitem>
+          <para>Pan, a GTK-based newsreader: <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/newsreaders/pan/default.nix"><filename>pkgs/applications/networking/newsreaders/pan/default.nix</filename></link>.
-        Has an optional dependency on <varname>gtkspell</varname>, which is
-        only built if <varname>spellCheck</varname> is <literal>true</literal>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Apache HTTPD:
-        <link
+          Has an optional dependency on <varname>gtkspell</varname>,
+          which is only built if <varname>spellCheck</varname> is
+          <literal>true</literal>.</para>
+        </listitem>
+
+        <listitem>
+          <para>Apache HTTPD: <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/servers/http/apache-httpd/2.4.nix"><filename>pkgs/servers/http/apache-httpd/2.4.nix</filename></link>.
-        A bunch of optional features, variable substitutions in the configure
-        flags, a post-install hook, and miscellaneous hackery.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Thunderbird:
-        <link
+          A bunch of optional features, variable substitutions in the
+          configure flags, a post-install hook, and miscellaneous
+          hackery.</para>
+        </listitem>
+
+        <listitem>
+          <para>Thunderbird: <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/mailreaders/thunderbird/default.nix"><filename>pkgs/applications/networking/mailreaders/thunderbird/default.nix</filename></link>.
-        Lots of dependencies.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        JDiskReport, a Java utility:
-        <link
+          Lots of dependencies.</para>
+        </listitem>
+
+        <listitem>
+          <para>JDiskReport, a Java utility: <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/misc/jdiskreport/default.nix"><filename>pkgs/tools/misc/jdiskreport/default.nix</filename></link>
-        (and the
-        <link
+          (and the <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/misc/jdiskreport/builder.sh">builder</link>).
-        Nixpkgs doesn’t have a decent <varname>stdenv</varname> for Java yet
-        so this is pretty ad-hoc.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        XML::Simple, a Perl module:
-        <link
+          Nixpkgs doesn’t have a decent <varname>stdenv</varname> for
+          Java yet so this is pretty ad-hoc.</para>
+        </listitem>
+
+        <listitem>
+          <para>XML::Simple, a Perl module: <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/perl-packages.nix"><filename>pkgs/top-level/perl-packages.nix</filename></link>
-        (search for the <varname>XMLSimple</varname> attribute). Most Perl
-        modules are so simple to build that they are defined directly in
-        <filename>perl-packages.nix</filename>; no need to make a separate file
-        for them.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Adobe Reader:
-        <link
+          (search for the <varname>XMLSimple</varname> attribute).
+          Most Perl modules are so simple to build that they are
+          defined directly in <filename>perl-packages.nix</filename>;
+          no need to make a separate file for them.</para>
+        </listitem>
+
+        <listitem>
+          <para>Adobe Reader: <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/misc/adobe-reader/default.nix"><filename>pkgs/applications/misc/adobe-reader/default.nix</filename></link>.
-        Shows how binary-only packages can be supported. In particular the
-        <link
+          Shows how binary-only packages can be supported.  In
+          particular the <link
          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/misc/adobe-reader/builder.sh">builder</link>
-        uses <command>patchelf</command> to set the RUNPATH and ELF interpreter
-        of the executables so that the right libraries are found at runtime.
-       </para>
-      </listitem>
-     </itemizedlist>
+          uses <command>patchelf</command> to set the RUNPATH and ELF
+          interpreter of the executables so that the right libraries
+          are found at runtime.</para>
+        </listitem>
+
+      </itemizedlist>
+
    </para>
-    <para>
-     Some notes:
-     <itemizedlist>
-      <listitem>
-       <para>
-        All <varname linkend="chap-meta">meta</varname> attributes are
-        optional, but it’s still a good idea to provide at least the
-        <varname>description</varname>, <varname>homepage</varname> and
-        <varname
-          linkend="sec-meta-license">license</varname>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        You can use <command>nix-prefetch-url</command> (or similar
-        nix-prefetch-git, etc) <replaceable>url</replaceable> to get the
-        SHA-256 hash of source distributions. There are similar commands as
-        <command>nix-prefetch-git</command> and
-        <command>nix-prefetch-hg</command> available in
-        <literal>nix-prefetch-scripts</literal> package.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        A list of schemes for <literal>mirror://</literal> URLs can be found in
-        <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/fetchurl/mirrors.nix"><filename>pkgs/build-support/fetchurl/mirrors.nix</filename></link>.
-       </para>
-      </listitem>
-     </itemizedlist>
+
+    <para>Some notes:
+
+      <itemizedlist>
+
+        <listitem>
+          <para>All <varname linkend="chap-meta">meta</varname>
+          attributes are optional, but it’s still a good idea to
+          provide at least the <varname>description</varname>,
+          <varname>homepage</varname> and <varname
+          linkend="sec-meta-license">license</varname>.</para>
+        </listitem>
+
+        <listitem>
+          <para>You can use <command>nix-prefetch-url</command> (or similar nix-prefetch-git, etc)
+          <replaceable>url</replaceable> to get the SHA-256 hash of
+          source distributions. There are similar commands as <command>nix-prefetch-git</command> and
+          <command>nix-prefetch-hg</command> available in <literal>nix-prefetch-scripts</literal> package.</para>
+        </listitem>
+
+        <listitem>
+          <para>A list of schemes for <literal>mirror://</literal>
+          URLs can be found in <link
+          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/fetchurl/mirrors.nix"><filename>pkgs/build-support/fetchurl/mirrors.nix</filename></link>.</para>
+        </listitem>
+
+      </itemizedlist>
+
    </para>
-    <para>
-     The exact syntax and semantics of the Nix expression language, including
-     the built-in function, are described in the Nix manual in the
-     <link
+
+    <para>The exact syntax and semantics of the Nix expression
+    language, including the built-in function, are described in the
+    Nix manual in the <link
    xlink:href="http://hydra.nixos.org/job/nix/trunk/tarball/latest/download-by-type/doc/manual/#chap-writing-nix-expressions">chapter
-     on writing Nix expressions</link>.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Add a call to the function defined in the previous step to
-     <link
+    on writing Nix expressions</link>.</para>
+    
+  </listitem>
+
+  <listitem>
+    <para>Add a call to the function defined in the previous step to
+    <link
    xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/all-packages.nix"><filename>pkgs/top-level/all-packages.nix</filename></link>
-     with some descriptive name for the variable, e.g.
-     <varname>libfoo</varname>.
-<screen>
+    with some descriptive name for the variable,
+    e.g. <varname>libfoo</varname>.
+
+    <screen>
 $ emacs pkgs/top-level/all-packages.nix</screen>
+      
    </para>
-    <para>
-     The attributes in that file are sorted by category (like “Development /
-     Libraries”) that more-or-less correspond to the directory structure of
-     Nixpkgs, and then by attribute name.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     To test whether the package builds, run the following command from the
-     root of the nixpkgs source tree:
-<screen>
+
+    <para>The attributes in that file are sorted by category (like
+    “Development / Libraries”) that more-or-less correspond to the
+    directory structure of Nixpkgs, and then by attribute name.</para>
+  </listitem>
+
+  <listitem>
+    <para>To test whether the package builds, run the following command
+    from the root of the nixpkgs source tree:
+
+    <screen>
 $ nix-build -A libfoo</screen>
-     where <varname>libfoo</varname> should be the variable name defined in the
-     previous step. You may want to add the flag <option>-K</option> to keep
-     the temporary build directory in case something fails. If the build
-     succeeds, a symlink <filename>./result</filename> to the package in the
-     Nix store is created.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     If you want to install the package into your profile (optional), do
-<screen>
+
+    where <varname>libfoo</varname> should be the variable name
+    defined in the previous step.  You may want to add the flag
+    <option>-K</option> to keep the temporary build directory in case
+    something fails.  If the build succeeds, a symlink
+    <filename>./result</filename> to the package in the Nix store is
+    created.</para>
+  </listitem>
+
+  <listitem>
+    <para>If you want to install the package into your profile
+    (optional), do
+
+    <screen>
 $ nix-env -f . -iA libfoo</screen>
+
    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Optionally commit the new package and open a pull request, or send a patch
-     to <literal>https://groups.google.com/forum/#!forum/nix-devel</literal>.
-    </para>
-   </listitem>
-  </orderedlist>
- </para>
+  </listitem>
+
+  <listitem>
+    <para>Optionally commit the new package and open a pull request, or send a patch to
+    <literal>nix-dev@cs.uu.nl</literal>.</para>
+  </listitem>
+
+
+</orderedlist>
+
+</para>
+
 </chapter>
--- a/doc/release-notes.xml
+++ b/doc/release-notes.xml
--- a/doc/reviewing-contributions.xml
+++ b/doc/reviewing-contributions.xml
@@ -1,618 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-        xmlns:xlink="http://www.w3.org/1999/xlink"
-        xmlns:xi="http://www.w3.org/2001/XInclude"
-        version="5.0"
-        xml:id="sec-reviewing-contributions">
- <title>Reviewing contributions</title>
- <warning>
-  <para>
-   The following section is a draft, and the policy for reviewing is still
-   being discussed in issues such as
-   <link
-	   xlink:href="https://github.com/NixOS/nixpkgs/issues/11166">#11166
-   </link> and
-   <link
-	   xlink:href="https://github.com/NixOS/nixpkgs/issues/20836">#20836
-   </link>.
-  </para>
- </warning>
- <para>
-  The nixpkgs project receives a fairly high number of contributions via GitHub
-  pull-requests. Reviewing and approving these is an important task and a way
-  to contribute to the project.
- </para>
- <para>
-  The high change rate of nixpkgs makes any pull request that remains open for
-  too long subject to conflicts that will require extra work from the submitter
-  or the merger. Reviewing pull requests in a timely manner and being
-  responsive to the comments is the key to avoid these. GitHub provides sort
-  filters that can be used to see the
-  <link
-    xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-desc">most
-  recently</link> and the
-  <link
-    xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-asc">least
-  recently</link> updated pull-requests. We highly encourage looking at
-  <link xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+review%3Anone+status%3Asuccess+-label%3A%222.status%3A+work-in-progress%22+no%3Aproject+no%3Aassignee+no%3Amilestone">
-  this list of ready to merge, unreviewed pull requests</link>.
- </para>
- <para>
-  When reviewing a pull request, please always be nice and polite.
-  Controversial changes can lead to controversial opinions, but it is important
-  to respect every community member and their work.
- </para>
- <para>
-  GitHub provides reactions as a simple and quick way to provide feedback to
-  pull-requests or any comments. The thumb-down reaction should be used with
-  care and if possible accompanied with some explanation so the submitter has
-  directions to improve their contribution.
- </para>
- <para>
-  Pull-request reviews should include a list of what has been reviewed in a
-  comment, so other reviewers and mergers can know the state of the review.
- </para>
- <para>
-  All the review template samples provided in this section are generic and
-  meant as examples. Their usage is optional and the reviewer is free to adapt
-  them to their liking.
- </para>
- <section xml:id="reviewing-contributions-package-updates">
-  <title>Package updates</title>
-
-  <para>
-   A package update is the most trivial and common type of pull-request. These
-   pull-requests mainly consist of updating the version part of the package
-   name and the source hash.
-  </para>
-
-  <para>
-   It can happen that non-trivial updates include patches or more complex
-   changes.
-  </para>
-
-  <para>
-   Reviewing process:
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Add labels to the pull-request. (Requires commit rights)
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>8.has: package (update)</literal> and any topic label that fit
-       the updated package.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the package versioning fits the guidelines.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the commit text fits the guidelines.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the package maintainers are notified.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <link xlink:href="https://help.github.com/articles/about-codeowners/">CODEOWNERS</link>
-       will make GitHub notify users based on the submitted changes, but it can
-       happen that it misses some of the package maintainers.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the meta field information is correct.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       License can change with version updates, so it should be checked to
-       match the upstream license.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       If the package has no maintainer, a maintainer must be set. This can be
-       the update submitter or a community member that accepts to take
-       maintainership of the package.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the code contains no typos.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Building the package locally.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Pull-requests are often targeted to the master or staging branch, and
-       building the pull-request locally when it is submitted can trigger many
-       source builds.
-      </para>
-      <para>
-       It is possible to rebase the changes on nixos-unstable or
-       nixpkgs-unstable for easier review by running the following commands
-       from a nixpkgs clone.
-<screen>
-$ git remote add channels https://github.com/NixOS/nixpkgs-channels.git <co
-  xml:id='reviewing-rebase-1' />
-$ git fetch channels nixos-unstable <co xml:id='reviewing-rebase-2' />
-$ git fetch origin pull/PRNUMBER/head <co xml:id='reviewing-rebase-3' />
-$ git rebase --onto nixos-unstable BASEBRANCH FETCH_HEAD <co
-  xml:id='reviewing-rebase-4' />
-</screen>
-       <calloutlist>
-        <callout arearefs='reviewing-rebase-1'>
-         <para>
-          This should be done only once to be able to fetch channel branches
-          from the nixpkgs-channels repository.
-         </para>
-        </callout>
-        <callout arearefs='reviewing-rebase-2'>
-         <para>
-          Fetching the nixos-unstable branch.
-         </para>
-        </callout>
-        <callout arearefs='reviewing-rebase-3'>
-         <para>
-          Fetching the pull-request changes, <varname>PRNUMBER</varname> is the
-          number at the end of the pull-request title and
-          <varname>BASEBRANCH</varname> the base branch of the pull-request.
-         </para>
-        </callout>
-        <callout arearefs='reviewing-rebase-4'>
-         <para>
-          Rebasing the pull-request changes to the nixos-unstable branch.
-         </para>
-        </callout>
-       </calloutlist>
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       The <link xlink:href="https://github.com/madjar/nox">nox</link> tool can
-       be used to review a pull-request content in a single command. It doesn't
-       rebase on a channel branch so it might trigger multiple source builds.
-       <varname>PRNUMBER</varname> should be replaced by the number at the end
-       of the pull-request title.
-      </para>
-<screen>
-$ nix-shell -p nox --run "nox-review -k pr PRNUMBER"
-</screen>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Running every binary.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <example xml:id="reviewing-contributions-sample-package-update">
-   <title>Sample template for a package update review</title>
-<screen>
-##### Reviewed points
-
- [ ] package name fits guidelines
- [ ] package version fits guidelines
- [ ] package build on ARCHITECTURE
- [ ] executables tested on ARCHITECTURE
- [ ] all depending packages build
-
-##### Possible improvements
-
-##### Comments
-
-</screen>
-  </example>
- </section>
- <section xml:id="reviewing-contributions-new-packages">
-  <title>New packages</title>
-
-  <para>
-   New packages are a common type of pull-requests. These pull requests
-   consists in adding a new nix-expression for a package.
-  </para>
-
-  <para>
-   Reviewing process:
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Add labels to the pull-request. (Requires commit rights)
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>8.has: package (new)</literal> and any topic label that fit the
-       new package.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the package versioning is fitting the guidelines.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the commit name is fitting the guidelines.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the meta field contains correct information.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       License must be checked to be fitting upstream license.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       Platforms should be set or the package will not get binary substitutes.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       A maintainer must be set, this can be the package submitter or a
-       community member that accepts to take maintainership of the package.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the code contains no typos.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure the package source.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Mirrors urls should be used when available.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       The most appropriate function should be used (e.g. packages from GitHub
-       should use <literal>fetchFromGitHub</literal>).
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Building the package locally.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Running every binary.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <example xml:id="reviewing-contributions-sample-new-package">
-   <title>Sample template for a new package review</title>
-<screen>
-##### Reviewed points
-
- [ ] package path fits guidelines
- [ ] package name fits guidelines
- [ ] package version fits guidelines
- [ ] package build on ARCHITECTURE
- [ ] executables tested on ARCHITECTURE
- [ ] `meta.description` is set and fits guidelines
- [ ] `meta.license` fits upstream license
- [ ] `meta.platforms` is set
- [ ] `meta.maintainers` is set
- [ ] build time only dependencies are declared in `nativeBuildInputs`
- [ ] source is fetched using the appropriate function
- [ ] phases are respected
- [ ] patches that are remotely available are fetched with `fetchpatch`
-
-##### Possible improvements
-
-##### Comments
-
-</screen>
-  </example>
- </section>
- <section xml:id="reviewing-contributions-module-updates">
-  <title>Module updates</title>
-
-  <para>
-   Module updates are submissions changing modules in some ways. These often
-   contains changes to the options or introduce new options.
-  </para>
-
-  <para>
-   Reviewing process
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Add labels to the pull-request. (Requires commit rights)
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>8.has: module (update)</literal> and any topic label that fit
-       the module.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the module maintainers are notified.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <link xlink:href="https://help.github.com/articles/about-codeowners/">CODEOWNERS</link>
-       will make GitHub notify users based on the submitted changes, but it can
-       happen that it misses some of the package maintainers.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the module tests, if any, are succeeding.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the introduced options are correct.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Type should be appropriate (string related types differs in their
-       merging capabilities, <literal>optionSet</literal> and
-       <literal>string</literal> types are deprecated).
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       Description, default and example should be provided.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that option changes are backward compatible.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>mkRenamedOptionModule</literal> and
-       <literal>mkAliasOptionModule</literal> functions provide way to make
-       option changes backward compatible.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that removed options are declared with
-     <literal>mkRemovedOptionModule</literal>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that changes that are not backward compatible are mentioned in
-     release notes.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that documentations affected by the change is updated.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <example xml:id="reviewing-contributions-sample-module-update">
-   <title>Sample template for a module update review</title>
-<screen>
-##### Reviewed points
-
- [ ] changes are backward compatible
- [ ] removed options are declared with `mkRemovedOptionModule`
- [ ] changes that are not backward compatible are documented in release notes
- [ ] module tests succeed on ARCHITECTURE
- [ ] options types are appropriate
- [ ] options description is set
- [ ] options example is provided
- [ ] documentation affected by the changes is updated
-
-##### Possible improvements
-
-##### Comments
-
-</screen>
-  </example>
- </section>
- <section xml:id="reviewing-contributions-new-modules">
-  <title>New modules</title>
-
-  <para>
-   New modules submissions introduce a new module to NixOS.
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Add labels to the pull-request. (Requires commit rights)
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>8.has: module (new)</literal> and any topic label that fit the
-       module.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the module tests, if any, are succeeding.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the introduced options are correct.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Type should be appropriate (string related types differs in their
-       merging capabilities, <literal>optionSet</literal> and
-       <literal>string</literal> types are deprecated).
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       Description, default and example should be provided.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that module <literal>meta</literal> field is present
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Maintainers should be declared in <literal>meta.maintainers</literal>.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       Module documentation should be declared with
-       <literal>meta.doc</literal>.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the module respect other modules functionality.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       For example, enabling a module should not open firewall ports by
-       default.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-  </itemizedlist>
-
-  <example xml:id="reviewing-contributions-sample-new-module">
-   <title>Sample template for a new module review</title>
-<screen>
-##### Reviewed points
-
- [ ] module path fits the guidelines
- [ ] module tests succeed on ARCHITECTURE
- [ ] options have appropriate types
- [ ] options have default
- [ ] options have example
- [ ] options have descriptions
- [ ] No unneeded package is added to environment.systemPackages
- [ ] meta.maintainers is set
- [ ] module documentation is declared in meta.doc
-
-##### Possible improvements
-
-##### Comments
-
-</screen>
-  </example>
- </section>
- <section xml:id="reviewing-contributions-other-submissions">
-  <title>Other submissions</title>
-
-  <para>
-   Other type of submissions requires different reviewing steps.
-  </para>
-
-  <para>
-   If you consider having enough knowledge and experience in a topic and would
-   like to be a long-term reviewer for related submissions, please contact the
-   current reviewers for that topic. They will give you information about the
-   reviewing process. The main reviewers for a topic can be hard to find as
-   there is no list, but checking past pull-requests to see who reviewed or
-   git-blaming the code to see who committed to that topic can give some hints.
-  </para>
-
-  <para>
-   Container system, boot system and library changes are some examples of the
-   pull requests fitting this category.
-  </para>
- </section>
- <section xml:id="reviewing-contributions--merging-pull-requests">
-  <title>Merging pull-requests</title>
-
-  <para>
-   It is possible for community members that have enough knowledge and
-   experience on a special topic to contribute by merging pull requests.
-  </para>
-
-  <para>
-   TODO: add the procedure to request merging rights.
-  </para>
-
-<!--
-The following paragraph about how to deal with unactive contributors is just a
-proposition and should be modified to what the community agrees to be the right
-policy.
-
-<para>Please note that contributors with commit rights unactive for more than
-  three months will have their commit rights revoked.</para>
-->
-
-  <para>
-   In a case a contributor leaves definitively the Nix community, he should
-   create an issue or post on
-   <link
-   xlink:href="https://discourse.nixos.org">Discourse</link> with
-   references of packages and modules he maintains so the maintainership can be
-   taken over by other contributors.
-  </para>
- </section>
-</chapter>
--- a/doc/shell.nix
+++ b/doc/shell.nix
@@ -1,5 +0,0 @@
-{ pkgs ? import ../. {} }:
-(import ./default.nix {}).overrideAttrs (x: {
-  buildInputs = x.buildInputs ++ [ pkgs.xmloscopy pkgs.ruby ];
-
-})
--- a/doc/stdenv.xml
+++ b/doc/stdenv.xml
--- a/doc/style.css
+++ b/doc/style.css
@@ -29,8 +29,8 @@ h2 /* chapters, appendices, subtitle */
 }

 /* Extra space between chapters, appendices. */
-div.chapter > div.titlepage h2, div.appendix > div.titlepage h2
-{
+div.chapter > div.titlepage h2, div.appendix > div.titlepage h2 
+{ 
    margin-top: 1.5em;
 }

@@ -104,7 +104,7 @@ pre.screen, pre.programlisting
    padding: 3px 3px;
    margin-left: 1.5em;
    margin-right: 1.5em;
-
+    color: #600000;
    background: #f4f4f8;
    font-family: monospace;
    border-radius: 0.4em;
@@ -118,6 +118,7 @@ div.example pre.programlisting
    margin: 0 0 0 0;
 }

+
 /***************************************************************************
                               Notes, warnings etc:
 ***************************************************************************/
@@ -171,7 +172,7 @@ div.navfooter *


 /***************************************************************************
-                        Links colors and highlighting:
+                        Links colors and highlighting: 
 ***************************************************************************/

 a { text-decoration: none; }
@@ -208,7 +209,7 @@ tt, code
 .term
 {
    font-weight: bold;
-
+    
 }

 div.variablelist dd p, div.glosslist dd p
@@ -248,24 +249,7 @@ table
    box-shadow: 0.4em 0.4em 0.5em #e0e0e0;
 }

-table.simplelist
-{
-    text-align: left;
-    color: #005aa0;
-    border: 0;
-    padding: 5px;
-    background: #fffff5;
-    font-weight: normal;
-    font-style: italic;
-    box-shadow: none;
-    margin-bottom: 1em;
-}
-
-div.navheader table, div.navfooter table {
-    box-shadow: none;
-}
-
 div.affiliation
 {
    font-style: italic;
-}
+}
--- a/doc/submitting-changes.xml
+++ b/doc/submitting-changes.xml
@@ -1,513 +1,320 @@
 <chapter xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xml:id="chap-submitting-changes">
- <title>Submitting changes</title>
- <section xml:id="submitting-changes-making-patches">
-  <title>Making patches</title>

-  <itemizedlist>
-   <listitem>
-    <para>
-     Read <link xlink:href="https://nixos.org/nixpkgs/manual/">Manual (How to
-     write packages for Nix)</link>.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Fork the repository on GitHub.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Create a branch for your future fix.
-     <itemizedlist>
-      <listitem>
-       <para>
-        You can make branch from a commit of your local
-        <command>nixos-version</command>. That will help you to avoid
-        additional local compilations. Because you will receive packages from
-        binary cache.
-        <itemizedlist>
-         <listitem>
-          <para>
-           For example: <command>nixos-version</command> returns
-           <command>15.05.git.0998212 (Dingo)</command>. So you can do:
-          </para>
-         </listitem>
-        </itemizedlist>
+<title>Submitting changes</title>
+
+<section>
+<title>Making patches</title>
+
+<itemizedlist>
+<listitem>
+<para>Read <link xlink:href="https://nixos.org/nixpkgs/manual/">Manual (How to write packages for Nix)</link>.</para>
+</listitem>
+
+<listitem>
+<para>Fork the repository on GitHub.</para>
+</listitem>
+
+<listitem>
+<para>Create a branch for your future fix.
+
+<itemizedlist>
+<listitem>
+<para>You can make branch from a commit of your local <command>nixos-version</command>. That will help you to avoid additional local compilations. Because you will receive packages from binary cache.
+
+<itemizedlist>
+<listitem>
+<para>For example: <command>nixos-version</command> returns <command>15.05.git.0998212 (Dingo)</command>. So you can do:</para>
+</listitem>
+</itemizedlist>
+
 <screen>
 $ git checkout 0998212
 $ git checkout -b 'fix/pkg-name-update'
 </screen>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Please avoid working directly on the <command>master</command> branch.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Make commits of logical units.
-     <itemizedlist>
-      <listitem>
-       <para>
-        If you removed pkgs, made some major NixOS changes etc., write about
-        them in
-        <command>nixos/doc/manual/release-notes/rl-unstable.xml</command>.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Check for unnecessary whitespace with <command>git diff --check</command>
-     before committing.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Format the commit in a following way:
-    </para>
+</para>
+</listitem>
+
+<listitem>
+<para>Please avoid working directly on the <command>master</command> branch.</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+<listitem>
+<para>Make commits of logical units.
+
+<itemizedlist>
+<listitem>
+<para>If you removed pkgs, made some major NixOS changes etc., write about them in <command>nixos/doc/manual/release-notes/rl-unstable.xml</command>.</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+<listitem>
+<para>Check for unnecessary whitespace with <command>git diff --check</command> before committing.</para>
+</listitem>
+
+<listitem>
+<para>Format the commit in a following way:</para>
 <programlisting>
-(pkg-name | nixos/&lt;module>): (from -> to | init at version | refactor | etc)
+(pkg-name | service-name): (from -> to | init at version | refactor | etc)
 Additional information.
 </programlisting>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Examples:
-       <itemizedlist>
-        <listitem>
-         <para>
-          <command>nginx: init at 2.0.1</command>
-         </para>
-        </listitem>
-        <listitem>
-         <para>
-          <command>firefox: 54.0.1 -> 55.0</command>
-         </para>
-        </listitem>
-        <listitem>
-         <para>
-          <command>nixos/hydra: add bazBaz option</command>
-         </para>
-        </listitem>
-        <listitem>
-         <para>
-          <command>nixos/nginx: refactor config generation</command>
-         </para>
-        </listitem>
-       </itemizedlist>
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Test your changes. If you work with
-     <itemizedlist>
-      <listitem>
-       <para>
-        nixpkgs:
-        <itemizedlist>
-         <listitem>
-          <para>
-           update pkg ->
-           <itemizedlist>
-            <listitem>
-             <para>
-              <command>nix-env -i pkg-name -f &lt;path to your local nixpkgs
-              folder&gt;</command>
-             </para>
-            </listitem>
-           </itemizedlist>
-          </para>
-         </listitem>
-         <listitem>
-          <para>
-           add pkg ->
-           <itemizedlist>
-            <listitem>
-             <para>
-              Make sure it's in
-              <command>pkgs/top-level/all-packages.nix</command>
-             </para>
-            </listitem>
-            <listitem>
-             <para>
-              <command>nix-env -i pkg-name -f &lt;path to your local nixpkgs
-              folder&gt;</command>
-             </para>
-            </listitem>
-           </itemizedlist>
-          </para>
-         </listitem>
-         <listitem>
-          <para>
-           <emphasis>If you don't want to install pkg in you
-           profile</emphasis>.
-           <itemizedlist>
-            <listitem>
-             <para>
-              <command>nix-build -A pkg-attribute-name &lt;path to your local
-              nixpkgs folder&gt;/default.nix</command> and check results in the
-              folder <command>result</command>. It will appear in the same
-              directory where you did <command>nix-build</command>.
-             </para>
-            </listitem>
-           </itemizedlist>
-          </para>
-         </listitem>
-         <listitem>
-          <para>
-           If you did <command>nix-env -i pkg-name</command> you can do
-           <command>nix-env -e pkg-name</command> to uninstall it from your
-           system.
-          </para>
-         </listitem>
-        </itemizedlist>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        NixOS and its modules:
-        <itemizedlist>
-         <listitem>
-          <para>
-           You can add new module to your NixOS configuration file (usually
-           it's <command>/etc/nixos/configuration.nix</command>). And do
-           <command>sudo nixos-rebuild test -I nixpkgs=&lt;path to your local
-           nixpkgs folder&gt; --fast</command>.
-          </para>
-         </listitem>
-        </itemizedlist>
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     If you have commits <command>pkg-name: oh, forgot to insert
-     whitespace</command>: squash commits in this case. Use <command>git rebase
-     -i</command>.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Rebase you branch against current <command>master</command>.
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
- <section xml:id="submitting-changes-submitting-changes">
-  <title>Submitting changes</title>
+
+<itemizedlist>
+<listitem>
+<para>Examples:
+
+<itemizedlist>
+<listitem>
+<para>
+<command>nginx: init at 2.0.1</command>
+</para>
+</listitem>
+
+<listitem>
+<para>
+<command>firefox: 3.0 -> 3.1.1</command>
+</para>
+</listitem>
+
+<listitem>
+<para>
+<command>hydra service: add bazBaz option</command>
+</para>
+</listitem>
+
+<listitem>
+<para>
+<command>nginx service: refactor config generation</command>
+</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+</itemizedlist>
+</listitem>
+
+<listitem>
+<para>Test your changes. If you work with
+
+<itemizedlist>
+<listitem>
+<para>nixpkgs:
+
+<itemizedlist>
+<listitem>
+<para>update pkg ->
+
+<itemizedlist>
+<listitem>
+<para>
+<command>nix-env -i pkg-name -f &lt;path to your local nixpkgs folder&gt;</command>
+</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+<listitem>
+<para>add pkg ->
+
+<itemizedlist>
+<listitem>
+<para>Make sure it's in <command>pkgs/top-level/all-packages.nix</command>
+</para>
+</listitem>
+
+<listitem>
+<para>
+<command>nix-env -i pkg-name -f &lt;path to your local nixpkgs folder&gt;</command>
+</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+<listitem>
+<para>
+<emphasis>If you don't want to install pkg in you profile</emphasis>.
+
+<itemizedlist>
+<listitem>
+<para>
+<command>nix-build -A pkg-attribute-name &lt;path to your local nixpkgs folder&gt;/default.nix</command> and check results in the folder <command>result</command>. It will appear in the same directory where you did <command>nix-build</command>.</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+<listitem>
+<para>If you did <command>nix-env -i pkg-name</command> you can do <command>nix-env -e pkg-name</command> to uninstall it from your system.</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+<listitem>
+<para>NixOS and its modules:
+
+<itemizedlist>
+<listitem>
+<para>You can add new module to your NixOS configuration file (usually it's <command>/etc/nixos/configuration.nix</command>).
+            And do <command>sudo nixos-rebuild test -I nixpkgs=&lt;path to your local nixpkgs folder&gt; --fast</command>.</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+<listitem>
+<para>If you have commits <command>pkg-name: oh, forgot to insert whitespace</command>: squash commits in this case. Use <command>git rebase -i</command>.</para>
+</listitem>
+
+<listitem>
+<para>Rebase you branch against current <command>master</command>.</para>
+</listitem>
+</itemizedlist>
+</section>
+
+<section>
+<title>Submitting changes</title>
+
+<itemizedlist>
+<listitem>
+<para>Push your changes to your fork of nixpkgs.</para>
+</listitem>
+
+<listitem>
+<para>Create pull request:
+
+<itemizedlist>
+<listitem>
+<para>Write the title in format <command>(pkg-name | service): improvement</command>.
+
+<itemizedlist>
+<listitem>
+<para>If you update the pkg, write versions <command>from -> to</command>.</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+<listitem>
+<para>Write in comment if you have tested your patch. Do not rely much on <command>TravisCI</command>.</para>
+</listitem>
+
+<listitem>
+<para>If you make an improvement, write about your motivation.</para>
+</listitem>
+
+<listitem>
+<para>Notify maintainers of the package. For example add to the message: <command>cc @jagajaga @domenkozar</command>.</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+</itemizedlist>
+</section>
+
+<section>
+<title>Hotfixing pull requests</title>
+
+<itemizedlist>
+<listitem>
+<para>Make the appropriate changes in you branch.</para>
+</listitem>
+
+<listitem>
+<para>Don't create additional commits, do
+
+<itemizedlist>
+<listitem>
+<para><command>git rebase -i</command></para>
+</listitem>
+<listitem>
+<para>
+<command>git push --force</command> to your branch.</para>
+</listitem>
+</itemizedlist>
+</para>
+</listitem>
+
+</itemizedlist>
+</section>
+
+<section>
+<title>Commit policy</title>
+
+<itemizedlist>
+<listitem>
+<para>Commits must be sufficiently tested before being merged, both for the master and staging branches.</para>
+</listitem>
+
+<listitem>
+<para>Hydra builds for master and staging should not be used as testing platform, it's a build farm for changes that have been already tested.</para>
+</listitem>
+
+<listitem>
+<para>When changing the bootloader installation process, extra care must be taken. Grub installations cannot be rolled back, hence changes may break people's installations forever. For any non-trivial change to the bootloader please file a PR asking for review, especially from @edolstra.</para>
+</listitem>
+</itemizedlist>
+
+<section>
+  <title>Master branch</title>

  <itemizedlist>
-   <listitem>
-    <para>
-     Push your changes to your fork of nixpkgs.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Create pull request:
-     <itemizedlist>
-      <listitem>
-       <para>
-        Write the title in format <command>(pkg-name | nixos/&lt;module>):
-        improvement</command>.
-        <itemizedlist>
-         <listitem>
-          <para>
-           If you update the pkg, write versions <command>from -> to</command>.
-          </para>
-         </listitem>
-        </itemizedlist>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Write in comment if you have tested your patch. Do not rely much on
-        <command>TravisCI</command>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        If you make an improvement, write about your motivation.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Notify maintainers of the package. For example add to the message:
-        <command>cc @jagajaga @domenkozar</command>.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </listitem>
+    <listitem>
+      <para>
+        It should only see non-breaking commits that do not cause mass rebuilds.
+      </para>
+    </listitem>
  </itemizedlist>
- </section>
- <section xml:id="submitting-changes-pull-request-template">
-  <title>Pull Request Template</title>
+</section>

-  <para>
-   The pull request template helps determine what steps have been made for a
-   contribution so far, and will help guide maintainers on the status of a
-   change. The motivation section of the PR should include any extra details
-   the title does not address and link any existing issues related to the pull
-   request.
-  </para>
-
-  <para>
-   When a PR is created, it will be pre-populated with some checkboxes detailed
-   below:
-  </para>
-
-  <section xml:id="submitting-changes-tested-with-sandbox">
-   <title>Tested using sandboxing</title>
-
-   <para>
-    When sandbox builds are enabled, Nix will setup an isolated environment for
-    each build process. It is used to remove further hidden dependencies set by
-    the build environment to improve reproducibility. This includes access to
-    the network during the build outside of <function>fetch*</function>
-    functions and files outside the Nix store. Depending on the operating
-    system access to other resources are blocked as well (ex. inter process
-    communication is isolated on Linux); see
-    <link
-      xlink:href="https://nixos.org/nix/manual/#description-45">build-use-sandbox</link>
-    in Nix manual for details.
-   </para>
-
-   <para>
-    Sandboxing is not enabled by default in Nix due to a small performance hit
-    on each build. In pull requests for
-    <link
-        xlink:href="https://github.com/NixOS/nixpkgs/">nixpkgs</link>
-    people are asked to test builds with sandboxing enabled (see
-    <literal>Tested using sandboxing</literal> in the pull request template)
-    because
-    in<link
-        xlink:href="https://nixos.org/hydra/">https://nixos.org/hydra/</link>
-    sandboxing is also used.
-   </para>
-
-   <para>
-    Depending if you use NixOS or other platforms you can use one of the
-    following methods to enable sandboxing
-    <emphasis role="bold">before</emphasis> building the package:
-    <itemizedlist>
-     <listitem>
-      <para>
-       <emphasis role="bold">Globally enable sandboxing on NixOS</emphasis>:
-       add the following to <filename>configuration.nix</filename>
-<screen>nix.useSandbox = true;</screen>
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       <emphasis role="bold">Globally enable sandboxing on non-NixOS
-       platforms</emphasis>: add the following to:
-       <filename>/etc/nix/nix.conf</filename>
-<screen>build-use-sandbox = true</screen>
-      </para>
-     </listitem>
-    </itemizedlist>
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-platform-diversity">
-   <title>Built on platform(s)</title>
-
-   <para>
-    Many Nix packages are designed to run on multiple platforms. As such, it's
-    important to let the maintainer know which platforms your changes have been
-    tested on. It's not always practical to test a change on all platforms, and
-    is not required for a pull request to be merged. Only check the systems you
-    tested the build on in this section.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-nixos-tests">
-   <title>Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)</title>
-
-   <para>
-    Packages with automated tests are much more likely to be merged in a timely
-    fashion because it doesn't require as much manual testing by the maintainer
-    to verify the functionality of the package. If there are existing tests for
-    the package, they should be run to verify your changes do not break the
-    tests. Tests only apply to packages with NixOS modules defined and can only
-    be run on Linux. For more details on writing and running tests, see the
-    <link
-        xlink:href="https://nixos.org/nixos/manual/index.html#sec-nixos-tests">section
-    in the NixOS manual</link>.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-tested-compilation">
-   <title>Tested compilation of all pkgs that depend on this change using <command>nox-review</command></title>
-
-   <para>
-    If you are updating a package's version, you can use nox to make sure all
-    packages that depend on the updated package still compile correctly. This
-    can be done using the nox utility. The <command>nox-review</command>
-    utility can look for and build all dependencies either based on uncommited
-    changes with the <literal>wip</literal> option or specifying a github pull
-    request number.
-   </para>
-
-   <para>
-    review uncommitted changes:
-<screen>nix-shell -p nox --run "nox-review wip"</screen>
-   </para>
-
-   <para>
-    review changes from pull request number 12345:
-<screen>nix-shell -p nox --run "nox-review pr 12345"</screen>
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-tested-execution">
-   <title>Tested execution of all binary files (usually in <filename>./result/bin/</filename>)</title>
-
-   <para>
-    It's important to test any executables generated by a build when you change
-    or create a package in nixpkgs. This can be done by looking in
-    <filename>./result/bin</filename> and running any files in there, or at a
-    minimum, the main executable for the package. For example, if you make a
-    change to <package>texlive</package>, you probably would only check the
-    binaries associated with the change you made rather than testing all of
-    them.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-contribution-standards">
-   <title>Meets Nixpkgs contribution standards</title>
-
-   <para>
-    The last checkbox is fits
-    <link
-        xlink:href="https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md">CONTRIBUTING.md</link>.
-    The contributing document has detailed information on standards the Nix
-    community has for commit messages, reviews, licensing of contributions you
-    make to the project, etc... Everyone should read and understand the
-    standards the community has for contributing before submitting a pull
-    request.
-   </para>
-  </section>
- </section>
- <section xml:id="submitting-changes-hotfixing-pull-requests">
-  <title>Hotfixing pull requests</title>
+<section>
+  <title>Staging branch</title>

  <itemizedlist>
-   <listitem>
-    <para>
-     Make the appropriate changes in you branch.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Don't create additional commits, do
-     <itemizedlist>
-      <listitem>
-       <para>
-        <command>git rebase -i</command>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        <command>git push --force</command> to your branch.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </listitem>
+    <listitem>
+      <para>
+        It's only for non-breaking mass-rebuild commits. That means it's not to
+        be used for testing, and changes must have been well tested already.
+        <link xlink:href="http://comments.gmane.org/gmane.linux.distributions.nixos/13447">Read policy here</link>.
+      </para>
+    </listitem>
+    <listitem>
+      <para>
+        If the branch is already in a broken state, please refrain from adding
+        extra new breakages. Stabilize it for a few days, merge into master,
+        then resume development on staging.
+        <link xlink:href="http://hydra.nixos.org/jobset/nixpkgs/staging#tabs-evaluations">Keep an eye on the staging evaluations here</link>.
+        If any fixes for staging happen to be already in master, then master can
+        be merged into staging.
+      </para>
+    </listitem>
  </itemizedlist>
- </section>
- <section xml:id="submitting-changes-commit-policy">
-  <title>Commit policy</title>
+</section>
+
+<section>
+  <title>Stable release branches</title>

  <itemizedlist>
-   <listitem>
-    <para>
-     Commits must be sufficiently tested before being merged, both for the
-     master and staging branches.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Hydra builds for master and staging should not be used as testing
-     platform, it's a build farm for changes that have been already tested.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     When changing the bootloader installation process, extra care must be
-     taken. Grub installations cannot be rolled back, hence changes may break
-     people's installations forever. For any non-trivial change to the
-     bootloader please file a PR asking for review, especially from @edolstra.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <section xml:id="submitting-changes-master-branch">
-   <title>Master branch</title>
-
-   <itemizedlist>
    <listitem>
-     <para>
-      It should only see non-breaking commits that do not cause mass rebuilds.
-     </para>
-    </listitem>
-   </itemizedlist>
-  </section>
-
-  <section xml:id="submitting-changes-staging-branch">
-   <title>Staging branch</title>
-
-   <itemizedlist>
-    <listitem>
-     <para>
-      It's only for non-breaking mass-rebuild commits. That means it's not to
-      be used for testing, and changes must have been well tested already.
-      <link xlink:href="https://web.archive.org/web/20160528180406/http://comments.gmane.org/gmane.linux.distributions.nixos/13447">Read
-      policy here</link>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      If the branch is already in a broken state, please refrain from adding
-      extra new breakages. Stabilize it for a few days, merge into master, then
-      resume development on staging.
-      <link xlink:href="http://hydra.nixos.org/jobset/nixpkgs/staging#tabs-evaluations">Keep
-      an eye on the staging evaluations here</link>. If any fixes for staging
-      happen to be already in master, then master can be merged into staging.
-     </para>
-    </listitem>
-   </itemizedlist>
-  </section>
-
-  <section xml:id="submitting-changes-stable-release-branches">
-   <title>Stable release branches</title>
-
-   <itemizedlist>
-    <listitem>
-     <para>
-      If you're cherry-picking a commit to a stable release branch, always use
-      <command>git cherry-pick -xe</command> and ensure the message contains a
-      clear description about why this needs to be included in the stable
-      branch.
-     </para>
-     <para>
-      An example of a cherry-picked commit would look like this:
-     </para>
-<screen>
+      <para>
+        If you're cherry-picking a commit to a stable release branch, always use
+        <command>git cherry-pick -xe</command> and ensure the message contains a
+        clear description about why this needs to be included in the stable
+        branch.
+      </para>
+      <para>An example of a cherry-picked commit would look like this:</para>
+      <screen>
 nixos: Refactor the world.

 The original commit message describing the reason why the world was torn apart.
@@ -517,7 +324,9 @@ Reason: I just had a gut feeling that this would also be wanted by people from
 the stone age.
      </screen>
    </listitem>
-   </itemizedlist>
-  </section>
- </section>
+  </itemizedlist>
+</section>
+
+</section>
 </chapter>
+
--- a/lib/attrsets.nix
+++ b/lib/attrsets.nix
@@ -1,26 +1,20 @@
-{ lib }:
 # Operations on attribute sets.

-let
+with {
  inherit (builtins) head tail length;
-  inherit (lib.trivial) and;
-  inherit (lib.strings) concatStringsSep;
-  inherit (lib.lists) fold concatMap concatLists;
-in
+  inherit (import ./trivial.nix) or;
+  inherit (import ./default.nix) fold;
+  inherit (import ./strings.nix) concatStringsSep;
+  inherit (import ./lists.nix) concatMap concatLists all deepSeqList;
+};

 rec {
  inherit (builtins) attrNames listToAttrs hasAttr isAttrs getAttr;


-  /* Return an attribute from nested attribute sets.
-
-     Example:
-       x = { a = { b = 3; }; }
-       attrByPath ["a" "b"] 6 x
-       => 3
-       attrByPath ["z" "z"] 6 x
-       => 6
-  */
+  /* Return an attribute from nested attribute sets.  For instance
+     ["x" "y"] applied to some set e returns e.x.y, if it exists.  The
+     default value is returned otherwise. */
  attrByPath = attrPath: default: e:
    let attr = head attrPath;
    in
@@ -30,15 +24,8 @@ rec {
      else default;

  /* Return if an attribute from nested attribute set exists.
-
-     Example:
-       x = { a = { b = 3; }; }
-       hasAttrByPath ["a" "b"] x
-       => true
-       hasAttrByPath ["z" "z"] x
-       => false
-
-  */
+     For instance ["x" "y"] applied to some set e returns true, if e.x.y exists. False
+     is returned otherwise. */
  hasAttrByPath = attrPath: e:
    let attr = head attrPath;
    in
@@ -48,28 +35,14 @@ rec {
      else false;


-  /* Return nested attribute set in which an attribute is set.
-
-     Example:
-       setAttrByPath ["a" "b"] 3
-       => { a = { b = 3; }; }
-  */
+  /* Return nested attribute set in which an attribute is set.  For instance
+     ["x" "y"] applied with some value v returns `x.y = v;' */
  setAttrByPath = attrPath: value:
    if attrPath == [] then value
    else listToAttrs
      [ { name = head attrPath; value = setAttrByPath (tail attrPath) value; } ];


-  /* Like `getAttrPath' without a default value. If it doesn't find the
-     path it will throw.
-
-     Example:
-       x = { a = { b = 3; }; }
-       getAttrFromPath ["a" "b"] x
-       => 3
-       getAttrFromPath ["z" "z"] x
-       => error: cannot find attribute `z.z'
-  */
  getAttrFromPath = attrPath: set:
    let errorMsg = "cannot find attribute `" + concatStringsSep "." attrPath + "'";
    in attrByPath attrPath (abort errorMsg) set;
@@ -116,7 +89,7 @@ rec {
    listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));


-  /* Filter an attribute set recursively by removing all attributes for
+  /* Filter an attribute set recursivelly by removing all attributes for
     which the given predicate return false.

     Example:
@@ -136,16 +109,14 @@ rec {
      ) (attrNames set)
    );

-  /* Apply fold functions to values grouped by key.
-
-     Example:
-       foldAttrs (n: a: [n] ++ a) [] [{ a = 2; } { a = 3; }]
-       => { a = [ 2 3 ]; }
+  /* foldAttrs: apply fold functions to values grouped by key. Eg accumulate values as list:
+     foldAttrs (n: a: [n] ++ a) [] [{ a = 2; } { a = 3; }]
+     => { a = [ 2 3 ]; }
  */
  foldAttrs = op: nul: list_of_attrs:
    fold (n: a:
        fold (name: o:
-          o // { ${name} = op n.${name} (a.${name} or nul); }
+          o // (listToAttrs [{inherit name; value = op n.${name} (a.${name} or nul); }])
        ) a (attrNames n)
    ) {} list_of_attrs;

@@ -176,12 +147,7 @@ rec {


  /* Utility function that creates a {name, value} pair as expected by
-     builtins.listToAttrs.
-
-     Example:
-       nameValuePair "some" 6
-       => { name = "some"; value = 6; }
-  */
+     builtins.listToAttrs. */
  nameValuePair = name: value: { inherit name value; };


@@ -195,9 +161,8 @@ rec {
          { x = "foo"; y = "bar"; }
       => { x = "x-foo"; y = "y-bar"; }
  */
-  mapAttrs = builtins.mapAttrs or
-    (f: set:
-      listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set)));
+  mapAttrs = f: set:
+    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set));


  /* Like `mapAttrs', but allows the name of each attribute to be
@@ -283,78 +248,48 @@ rec {
    listToAttrs (map (n: nameValuePair n (f n)) names);


-  /* Check whether the argument is a derivation. Any set with
-     { type = "derivation"; } counts as a derivation.
-
-     Example:
-       nixpkgs = import <nixpkgs> {}
-       isDerivation nixpkgs.ruby
-       => true
-       isDerivation "foobar"
-       => false
-  */
+  /* Check whether the argument is a derivation. */
  isDerivation = x: isAttrs x && x ? type && x.type == "derivation";

-  /* Converts a store path to a fake derivation. */
+
+  /* Convert a store path to a fake derivation. */
  toDerivation = path:
-    let
-      path' = builtins.storePath path;
-      res =
-        { type = "derivation";
-          name = builtins.unsafeDiscardStringContext (builtins.substring 33 (-1) (baseNameOf path'));
-          outPath = path';
-          outputs = [ "out" ];
-          out = res;
-          outputName = "out";
-        };
-    in res;
+    let path' = builtins.storePath path; in
+    { type = "derivation";
+      name = builtins.unsafeDiscardStringContext (builtins.substring 33 (-1) (baseNameOf path'));
+      outPath = path';
+      outputs = [ "out" ];
+    };


-  /* If `cond' is true, return the attribute set `as',
-     otherwise an empty attribute set.
-
-     Example:
-       optionalAttrs (true) { my = "set"; }
-       => { my = "set"; }
-       optionalAttrs (false) { my = "set"; }
-       => { }
-  */
+  /* If the Boolean `cond' is true, return the attribute set `as',
+     otherwise an empty attribute set. */
  optionalAttrs = cond: as: if cond then as else {};


  /* Merge sets of attributes and use the function f to merge attributes
-     values.
-
-     Example:
-       zipAttrsWithNames ["a"] (name: vs: vs) [{a = "x";} {a = "y"; b = "z";}]
-       => { a = ["x" "y"]; }
-  */
+     values. */
  zipAttrsWithNames = names: f: sets:
    listToAttrs (map (name: {
      inherit name;
      value = f name (catAttrs name sets);
    }) names);

-  /* Implementation note: Common names  appear multiple times in the list of
-     names, hopefully this does not affect the system because the maximal
-     laziness avoid computing twice the same expression and listToAttrs does
-     not care about duplicated attribute names.
-
-     Example:
-       zipAttrsWith (name: values: values) [{a = "x";} {a = "y"; b = "z";}]
-       => { a = ["x" "y"]; b = ["z"] }
-  */
+  # implentation note: Common names  appear multiple times in the list of
+  # names, hopefully this does not affect the system because the maximal
+  # laziness avoid computing twice the same expression and listToAttrs does
+  # not care about duplicated attribute names.
  zipAttrsWith = f: sets: zipAttrsWithNames (concatMap attrNames sets) f sets;
-  /* Like `zipAttrsWith' with `(name: values: value)' as the function.

-    Example:
-      zipAttrs [{a = "x";} {a = "y"; b = "z";}]
-      => { a = ["x" "y"]; b = ["z"] }
-  */
  zipAttrs = zipAttrsWith (name: values: values);

+  /* backward compatibility */
+  zipWithNames = zipAttrsWithNames;
+  zip = builtins.trace "lib.zip is deprecated, use lib.zipAttrsWith instead" zipAttrsWith;
+
+
  /* Does the same as the update operator '//' except that attributes are
-     merged until the given predicate is verified.  The predicate should
+     merged until the given pedicate is verified.  The predicate should
     accept 3 arguments which are the path to reach the attribute, a part of
     the first attribute set and a part of the second attribute set.  When
     the predicate is verified, the value of the first attribute set is
@@ -384,16 +319,15 @@ rec {
  recursiveUpdateUntil = pred: lhs: rhs:
    let f = attrPath:
      zipAttrsWith (n: values:
-        let here = attrPath ++ [n]; in
        if tail values == []
-        || pred here (head (tail values)) (head values) then
+        || pred attrPath (head (tail values)) (head values) then
          head values
        else
-          f here values
+          f (attrPath ++ [n]) values
      );
    in f [] [rhs lhs];

-  /* A recursive variant of the update operator ‘//’.  The recursion
+  /* A recursive variant of the update operator ‘//’.  The recusion
     stops when one of the attribute values is not an attribute set,
     in which case the right hand side value takes precedence over the
     left hand side value.
@@ -417,54 +351,18 @@ rec {
      !(isAttrs lhs && isAttrs rhs)
    ) lhs rhs;

-  /* Returns true if the pattern is contained in the set. False otherwise.
-
-     Example:
-       matchAttrs { cpu = {}; } { cpu = { bits = 64; }; }
-       => true
-   */
-  matchAttrs = pattern: attrs: assert isAttrs pattern;
-    fold and true (attrValues (zipAttrsWithNames (attrNames pattern) (n: values:
+  matchAttrs = pattern: attrs:
+    fold or false (attrValues (zipAttrsWithNames (attrNames pattern) (n: values:
      let pat = head values; val = head (tail values); in
      if length values == 1 then false
-      else if isAttrs pat then isAttrs val && matchAttrs pat val
+      else if isAttrs pat then isAttrs val && matchAttrs head values
      else pat == val
    ) [pattern attrs]));

-  /* Override only the attributes that are already present in the old set
-    useful for deep-overriding.
-
-    Example:
-      x = { a = { b = 4; c = 3; }; }
-      overrideExisting x { a = { b = 6; d = 2; }; }
-      => { a = { b = 6; d = 2; }; }
-  */
+  # override only the attributes that are already present in the old set
+  # useful for deep-overriding
  overrideExisting = old: new:
    old // listToAttrs (map (attr: nameValuePair attr (attrByPath [attr] old.${attr} new)) (attrNames old));

-  /* Get a package output.
-     If no output is found, fallback to `.out` and then to the default.
-
-     Example:
-       getOutput "dev" pkgs.openssl
-       => "/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev"
-  */
-  getOutput = output: pkg:
-    if pkg.outputUnspecified or false
-      then pkg.${output} or pkg.out or pkg
-      else pkg;
-
-  getBin = getOutput "bin";
-  getLib = getOutput "lib";
-  getDev = getOutput "dev";
-
-  /* Pick the outputs of packages to place in buildInputs */
-  chooseDevOutputs = drvs: builtins.map getDev drvs;
-
-  /*** deprecated stuff ***/
-
-  zipWithNames = zipAttrsWithNames;
-  zip = builtins.trace
-    "lib.zip is deprecated, use lib.zipAttrsWith instead" zipAttrsWith;
-
+  deepSeqAttrs = x: y: deepSeqList (attrValues x) y;
 }
--- a/lib/composable-derivation.nix
+++ b/lib/composable-derivation.nix
@@ -1,5 +1,5 @@
-{lib, pkgs}:
-let inherit (lib) nvs; in
+{lib, pkgs} :
+let inherit (lib) nv nvs; in
 {

  # composableDerivation basically mixes these features:
@@ -19,7 +19,7 @@ let inherit (lib) nvs; in
  # * vim_configurable
  #
  # A minimal example illustrating most features would look like this:
-  # let base = composableDerivation { (fixed: let inherit (fixed.fixed) name in {
+  # let base = composableDerivation { (fixed : let inherit (fixed.fixed) name in {
  #    src = fetchurl {
  #    }
  #    buildInputs = [A];
@@ -39,7 +39,7 @@ let inherit (lib) nvs; in
  #
  # issues:
  # * its complicated to understand
-  # * some "features" such as exact merge behaviour are buried in mergeAttrBy
+  # * some "features" such as exact merge behaviour are burried in mergeAttrBy
  #   and defaultOverridableDelayableArgs assuming the default behaviour does
  #   the right thing in the common case
  # * Eelco once said using such fix style functions are slow to evaluate
@@ -48,9 +48,9 @@ let inherit (lib) nvs; in
  #   / add patches the way you want without having to declare function arguments
  #
  # nice features:
-  # declaring "optional features" is modular. For instance:
+  # declaring "optional featuers" is modular. For instance:
  #   flags.curl = {
-  #     configureFlags = ["--with-curl=${curl.dev}" "--with-curlwrappers"];
+  #     configureFlags = ["--with-curl=${curl}" "--with-curlwrappers"];
  #     buildInputs = [curl openssl];
  #   };
  #   flags.other = { .. }
@@ -79,7 +79,7 @@ let inherit (lib) nvs; in
        # consider adding addtional elements by derivation.merge { removeAttrs = ["elem"]; };
        removeAttrs ? ["cfg" "flags"]

-      }: (lib.defaultOverridableDelayableArgs ( a: mkDerivation a)
+      }: (lib.defaultOverridableDelayableArgs ( a: mkDerivation a) 
         {
           inherit applyPreTidy removeAttrs;
         }).merge;
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -1,19 +1,24 @@
-{ lib }:
+let
+
+  lib = import ./default.nix;
+  inherit (builtins) attrNames isFunction;
+
+in

 rec {


  /* `overrideDerivation drv f' takes a derivation (i.e., the result
     of a call to the builtin function `derivation') and returns a new
-     derivation in which the attributes of the original are overridden
+     derivation in which the attributes of the original are overriden
     according to the function `f'.  The function `f' is called with
     the original derivation attributes.

     `overrideDerivation' allows certain "ad-hoc" customisation
-     scenarios (e.g. in ~/.config/nixpkgs/config.nix).  For instance,
-     if you want to "patch" the derivation returned by a package
-     function in Nixpkgs to build another version than what the
-     function itself provides, you can do something like this:
+     scenarios (e.g. in ~/.nixpkgs/config.nix).  For instance, if you
+     want to "patch" the derivation returned by a package function in
+     Nixpkgs to build another version than what the function itself
+     provides, you can do something like this:

       mySed = overrideDerivation pkgs.gnused (oldAttrs: {
         name = "sed-4.2.2-pre";
@@ -31,7 +36,7 @@ rec {
  overrideDerivation = drv: f:
    let
      newDrv = derivation (drv.drvAttrs // (f drv));
-    in lib.flip (extendDerivation true) newDrv (
+    in addPassthru newDrv (
      { meta = drv.meta or {};
        passthru = if drv ? passthru then drv.passthru else {};
      }
@@ -46,41 +51,21 @@ rec {
       else { }));


-  /* `makeOverridable` takes a function from attribute set to attribute set and
-     injects `override` attibute which can be used to override arguments of
-     the function.
-
-       nix-repl> x = {a, b}: { result = a + b; }
-
-       nix-repl> y = lib.makeOverridable x { a = 1; b = 2; }
-
-       nix-repl> y
-       { override = «lambda»; overrideDerivation = «lambda»; result = 3; }
-
-       nix-repl> y.override { a = 10; }
-       { override = «lambda»; overrideDerivation = «lambda»; result = 12; }
-
-     Please refer to "Nixpkgs Contributors Guide" section
-     "<pkg>.overrideDerivation" to learn about `overrideDerivation` and caveats
-     related to its use.
-  */
  makeOverridable = f: origArgs:
    let
      ff = f origArgs;
-      overrideWith = newArgs: origArgs // (if lib.isFunction newArgs then newArgs origArgs else newArgs);
+      overrideWith = newArgs: origArgs // (if builtins.isFunction newArgs then newArgs origArgs else newArgs);
    in
-      if builtins.isAttrs ff then (ff // {
-        override = newArgs: makeOverridable f (overrideWith newArgs);
-        overrideDerivation = fdrv:
-          makeOverridable (args: overrideDerivation (f args) fdrv) origArgs;
-        ${if ff ? overrideAttrs then "overrideAttrs" else null} = fdrv:
-          makeOverridable (args: (f args).overrideAttrs fdrv) origArgs;
-      })
-      else if lib.isFunction ff then {
-        override = newArgs: makeOverridable f (overrideWith newArgs);
-        __functor = self: ff;
-        overrideDerivation = throw "overrideDerivation not yet supported for functors";
-      }
+      if builtins.isAttrs ff then (ff //
+        { override = newArgs: makeOverridable f (overrideWith newArgs);
+          overrideDerivation = fdrv:
+            makeOverridable (args: overrideDerivation (f args) fdrv) origArgs;
+        })
+      else if builtins.isFunction ff then
+        { override = newArgs: makeOverridable f (overrideWith newArgs);
+          __functor = self: ff;
+          overrideDerivation = throw "overrideDerivation not yet supported for functors";
+        }
      else ff;


@@ -107,8 +92,8 @@ rec {
  */
  callPackageWith = autoArgs: fn: args:
    let
-      f = if lib.isFunction fn then fn else import fn;
-      auto = builtins.intersectAttrs (lib.functionArgs f) autoArgs;
+      f = if builtins.isFunction fn then fn else import fn;
+      auto = builtins.intersectAttrs (builtins.functionArgs f) autoArgs;
    in makeOverridable f (auto // args);


@@ -117,17 +102,19 @@ rec {
     individual attributes. */
  callPackagesWith = autoArgs: fn: args:
    let
-      f = if lib.isFunction fn then fn else import fn;
-      auto = builtins.intersectAttrs (lib.functionArgs f) autoArgs;
-      origArgs = auto // args;
-      pkgs = f origArgs;
-      mkAttrOverridable = name: pkg: makeOverridable (newArgs: (f newArgs).${name}) origArgs;
+      f = if builtins.isFunction fn then fn else import fn;
+      auto = builtins.intersectAttrs (builtins.functionArgs f) autoArgs;
+      finalArgs = auto // args;
+      pkgs = f finalArgs;
+      mkAttrOverridable = name: pkg: pkg // {
+        override = newArgs: mkAttrOverridable name (f (finalArgs // newArgs)).${name};
+      };
    in lib.mapAttrs mkAttrOverridable pkgs;


  /* Add attributes to each output of a derivation without changing
-     the derivation itself and check a given condition when evaluating. */
-  extendDerivation = condition: passthru: drv:
+     the derivation itself. */
+  addPassthru = drv: passthru:
    let
      outputs = drv.outputs or [ "out" ];

@@ -137,18 +124,13 @@ rec {
      outputToAttrListElement = outputName:
        { name = outputName;
          value = commonAttrs // {
-            inherit (drv.${outputName}) type outputName;
-            drvPath = assert condition; drv.${outputName}.drvPath;
-            outPath = assert condition; drv.${outputName}.outPath;
+            inherit (drv.${outputName}) outPath drvPath type outputName;
          };
        };

      outputsList = map outputToAttrListElement outputs;
-    in commonAttrs // {
-      outputUnspecified = true;
-      drvPath = assert condition; drv.drvPath;
-      outPath = assert condition; drv.outPath;
-    };
+  in commonAttrs.${drv.outputName};
+

  /* Strip a derivation of all non-essential attributes, returning
     only those needed by hydra-eval-jobs. Also strictly evaluate the
@@ -185,7 +167,7 @@ rec {
  /* Make a set of packages with a common scope. All packages called
     with the provided `callPackage' will be evaluated with the same
     arguments. Any package in the set may depend on any other. The
-     `overrideScope'` function allows subsequent modification of the package
+     `override' function allows subsequent modification of the package
     set in a consistent way, i.e. all packages in the set will be
     called with the overridden packages. The package sets may be
     hierarchical: the packages in the set are called with the scope
@@ -195,11 +177,9 @@ rec {
    let self = f self // {
          newScope = scope: newScope (self // scope);
          callPackage = self.newScope {};
-          overrideScope = g: lib.warn
-            "`overrideScope` (from `lib.makeScope`) is deprecated. Do `overrideScope' (self: super: { … })` instead of `overrideScope (super: self: { … })`. All other overrides have the parameters in that order, including other definitions of `overrideScope`. This was the only definition violating the pattern."
-            (makeScope newScope (lib.fixedPoints.extends (lib.flip g) f));
-          overrideScope' = g: makeScope newScope (lib.fixedPoints.extends g f);
-          packages = f;
+          override = g: makeScope newScope (self_:
+            let super = f self_;
+            in super // g super self_);
        };
    in self;

--- a/lib/debug.nix
+++ b/lib/debug.nix
@@ -1,155 +1,62 @@
-/* Collection of functions useful for debugging
-   broken nix expressions.
+let lib = import ./default.nix;
+
+inherit (builtins) trace attrNamesToStr isAttrs isFunction isList isInt
+        isString isBool head substring attrNames;
+
+inherit (lib) all id mapAttrsFlatten elem;

-   * `trace`-like functions take two values, print
-     the first to stderr and return the second.
-   * `traceVal`-like functions take one argument
-     which both printed and returned.
-   * `traceSeq`-like functions fully evaluate their
-     traced value before printing (not just to “weak
-     head normal form” like trace does by default).
-   * Functions that end in `-Fn` take an additional
-     function as their first argument, which is applied
-     to the traced value before it is printed.
-*/
-{ lib }:
-let
-  inherit (builtins) trace isAttrs isList isInt
-          head substring attrNames;
-  inherit (lib) id elem isFunction;
 in

 rec {

-  # -- TRACING --
+  inherit (builtins) addErrorContext;

-  /* Conditionally trace the supplied message, based on a predicate.
+  addErrorContextToAttrs = lib.mapAttrs (a: v: lib.addErrorContext "while evaluating ${a}" v);

-     Type: traceIf :: bool -> string -> a -> a
+  traceIf = p: msg: x: if p then trace msg x else x;

-     Example:
-       traceIf true "hello" 3
-       trace: hello
-       => 3
+  traceVal = x: trace x x;
+  traceXMLVal = x: trace (builtins.toXML x) x;
+  traceXMLValMarked = str: x: trace (str + builtins.toXML x) x;
+
+  # this can help debug your code as well - designed to not produce thousands of lines
+  traceShowVal = x : trace (showVal x) x;
+  traceShowValMarked = str: x: trace (str + showVal x) x;
+  attrNamesToStr = a : lib.concatStringsSep "; " (map (x : "${x}=") (attrNames a));
+  showVal = x :
+      if isAttrs x then
+          if x ? outPath then "x is a derivation, name ${if x ? name then x.name else "<no name>"}, { ${attrNamesToStr x} }"
+          else "x is attr set { ${attrNamesToStr x} }"
+      else if isFunction x then "x is a function"
+      else if x == [] then "x is an empty list"
+      else if isList x then "x is a list, first element is: ${showVal (head x)}"
+      else if x == true then "x is boolean true"
+      else if x == false then "x is boolean false"
+      else if x == null then "x is null"
+      else if isInt x then "x is an integer `${toString x}'"
+      else if isString x then "x is a string `${substring 0 50 x}...'"
+      else "x is probably a path `${substring 0 50 (toString x)}...'";
+
+  # trace the arguments passed to function and its result
+  # maybe rewrite these functions in a traceCallXml like style. Then one function is enough
+  traceCall  = n : f : a : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a));
+  traceCall2 = n : f : a : b : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b));
+  traceCall3 = n : f : a : b : c : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b) (t "arg 3" c));
+
+  # FIXME: rename this?
+  traceValIfNot = c: x:
+    if c x then true else trace (showVal x) false;
+
+  /* Evaluate a set of tests.  A test is an attribute set {expr,
+     expected}, denoting an expression and its expected result.  The
+     result is a list of failed tests, each represented as {name,
+     expected, actual}, denoting the attribute name of the failing
+     test and its expected and actual results.  Used for regression
+     testing of the functions in lib; see tests.nix for an example.
+     Only tests having names starting with "test" are run.
+     Add attr { tests = ["testName"]; } to run these test only
  */
-  traceIf =
-    # Predicate to check
-    pred:
-    # Message that should be traced
-    msg:
-    # Value to return
-    x: if pred then trace msg x else x;
-
-  /* Trace the supplied value after applying a function to it, and
-     return the original value.
-
-     Type: traceValFn :: (a -> b) -> a -> a
-
-     Example:
-       traceValFn (v: "mystring ${v}") "foo"
-       trace: mystring foo
-       => "foo"
-  */
-  traceValFn =
-    # Function to apply
-    f:
-    # Value to trace and return
-    x: trace (f x) x;
-
-  /* Trace the supplied value and return it.
-
-     Type: traceVal :: a -> a
-
-     Example:
-       traceVal 42
-       # trace: 42
-       => 42
-  */
-  traceVal = traceValFn id;
-
-  /* `builtins.trace`, but the value is `builtins.deepSeq`ed first.
-
-     Type: traceSeq :: a -> b -> b
-
-     Example:
-       trace { a.b.c = 3; } null
-       trace: { a = <CODE>; }
-       => null
-       traceSeq { a.b.c = 3; } null
-       trace: { a = { b = { c = 3; }; }; }
-       => null
-  */
-  traceSeq =
-    # The value to trace
-    x:
-    # The value to return
-    y: trace (builtins.deepSeq x x) y;
-
-  /* Like `traceSeq`, but only evaluate down to depth n.
-     This is very useful because lots of `traceSeq` usages
-     lead to an infinite recursion.
-
-     Example:
-       traceSeqN 2 { a.b.c = 3; } null
-       trace: { a = { b = {…}; }; }
-       => null
-   */
-  traceSeqN = depth: x: y: with lib;
-    let snip = v: if      isList  v then noQuotes "[…]" v
-                  else if isAttrs v then noQuotes "{…}" v
-                  else v;
-        noQuotes = str: v: { __pretty = const str; val = v; };
-        modify = n: fn: v: if (n == 0) then fn v
-                      else if isList  v then map (modify (n - 1) fn) v
-                      else if isAttrs v then mapAttrs
-                        (const (modify (n - 1) fn)) v
-                      else v;
-    in trace (generators.toPretty { allowPrettyValues = true; }
-               (modify depth snip x)) y;
-
-  /* A combination of `traceVal` and `traceSeq` that applies a
-     provided function to the value to be traced after `deepSeq`ing
-     it.
-  */
-  traceValSeqFn =
-    # Function to apply
-    f:
-    # Value to trace
-    v: traceValFn f (builtins.deepSeq v v);
-
-  /* A combination of `traceVal` and `traceSeq`. */
-  traceValSeq = traceValSeqFn id;
-
-  /* A combination of `traceVal` and `traceSeqN` that applies a
-  provided function to the value to be traced. */
-  traceValSeqNFn =
-    # Function to apply
-    f:
-    depth:
-    # Value to trace
-    v: traceSeqN depth (f v) v;
-
-  /* A combination of `traceVal` and `traceSeqN`. */
-  traceValSeqN = traceValSeqNFn id;
-
-
-  # -- TESTING --
-
-  /* Evaluate a set of tests.  A test is an attribute set `{expr,
-     expected}`, denoting an expression and its expected result.  The
-     result is a list of failed tests, each represented as `{name,
-     expected, actual}`, denoting the attribute name of the failing
-     test and its expected and actual results.
-
-     Used for regression testing of the functions in lib; see
-     tests.nix for an example. Only tests having names starting with
-     "test" are run.
-
-     Add attr { tests = ["testName"]; } to run these tests only.
-  */
-  runTests =
-    # Tests to run
-    tests: lib.concatLists (lib.attrValues (lib.mapAttrs (name: test:
+  runTests = tests: lib.concatLists (lib.attrValues (lib.mapAttrs (name: test:
    let testsToRun = if tests ? tests then tests.tests else [];
    in if (substring 0 4 name == "test" ||  elem name testsToRun)
       && ((testsToRun == []) || elem name tests.tests)
@@ -158,75 +65,31 @@ rec {
      then [ { inherit name; expected = test.expected; result = test.expr; } ]
      else [] ) tests));

-  /* Create a test assuming that list elements are `true`.
+  # create a test assuming that list elements are true
+  # usage: { testX = allTrue [ true ]; }
+  testAllTrue = expr : { inherit expr; expected = map (x: true) expr; };

-     Example:
-       { testX = allTrue [ true ]; }
-  */
-  testAllTrue = expr: { inherit expr; expected = map (x: true) expr; };
-
-
-  # -- DEPRECATED --
-
-  traceShowVal = x: trace (showVal x) x;
-  traceShowValMarked = str: x: trace (str + showVal x) x;
-
-  attrNamesToStr = a:
-    trace ( "Warning: `attrNamesToStr` is deprecated "
-          + "and will be removed in the next release. "
-          + "Please use more specific concatenation "
-          + "for your uses (`lib.concat(Map)StringsSep`)." )
-    (lib.concatStringsSep "; " (map (x: "${x}=") (attrNames a)));
-
-  showVal = with lib;
-    trace ( "Warning: `showVal` is deprecated "
-          + "and will be removed in the next release, "
-          + "please use `traceSeqN`" )
-    (let
-      modify = v:
-        let pr = f: { __pretty = f; val = v; };
-        in   if isDerivation v then pr
-          (drv: "<δ:${drv.name}:${concatStringsSep ","
-                                 (attrNames drv)}>")
-        else if [] ==   v then pr (const "[]")
-        else if isList  v then pr (l: "[ ${go (head l)}, … ]")
-        else if isAttrs v then pr
-          (a: "{ ${ concatStringsSep ", " (attrNames a)} }")
-        else v;
-      go = x: generators.toPretty
-        { allowPrettyValues = true; }
-        (modify x);
-    in go);
-
-  traceXMLVal = x:
-    trace ( "Warning: `traceXMLVal` is deprecated "
-          + "and will be removed in the next release. "
-          + "Please use `traceValFn builtins.toXML`." )
-    (trace (builtins.toXML x) x);
-  traceXMLValMarked = str: x:
-    trace ( "Warning: `traceXMLValMarked` is deprecated "
-          + "and will be removed in the next release. "
-          + "Please use `traceValFn (x: str + builtins.toXML x)`." )
-    (trace (str + builtins.toXML x) x);
-
-  # trace the arguments passed to function and its result
-  # maybe rewrite these functions in a traceCallXml like style. Then one function is enough
-  traceCall  = n: f: a: let t = n2: x: traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a));
-  traceCall2 = n: f: a: b: let t = n2: x: traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b));
-  traceCall3 = n: f: a: b: c: let t = n2: x: traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b) (t "arg 3" c));
-
-  traceValIfNot = c: x:
-    trace ( "Warning: `traceValIfNot` is deprecated "
-          + "and will be removed in the next release. "
-          + "Please use `if/then/else` and `traceValSeq 1`.")
-    (if c x then true else traceSeq (showVal x) false);
-
-
-  addErrorContextToAttrs = attrs:
-    trace ( "Warning: `addErrorContextToAttrs` is deprecated "
-          + "and will be removed in the next release. "
-          + "Please use `builtins.addErrorContext` directly." )
-    (lib.mapAttrs (a: v: lib.addErrorContext "while evaluating ${a}" v) attrs);
+  # evaluate everything once so that errors will occur earlier
+  # hacky: traverse attrs by adding a dummy
+  # ignores functions (should this behavior change?) See strictf
+  #
+  # Note: This should be a primop! Something like seq of haskell would be nice to
+  # have as well. It's used fore debugging only anyway
+  strict = x :
+    let
+        traverse = x :
+          if isString x then true
+          else if isAttrs x then
+            if x ? outPath then true
+            else all id (mapAttrsFlatten (n: traverse) x)
+          else if isList x then
+            all id (map traverse x)
+          else if isBool x then true
+          else if isFunction x then true
+          else if isInt x then true
+          else if x == null then true
+          else true; # a (store) path?
+    in if traverse x then x else throw "else never reached";

  # example: (traceCallXml "myfun" id 3) will output something like
  # calling myfun arg 1: 3 result: 3
@@ -234,20 +97,17 @@ rec {
  # note: if result doesn't evaluate you'll get no trace at all (FIXME)
  #       args should be printed in any case
  traceCallXml = a:
-    trace ( "Warning: `traceCallXml` is deprecated "
-          + "and will be removed in the next release. "
-          + "Please complain if you use the function regularly." )
-    (if !isInt a then
+    if !isInt a then
      traceCallXml 1 "calling ${a}\n"
    else
      let nr = a;
      in (str: expr:
          if isFunction expr then
            (arg:
-              traceCallXml (builtins.add 1 nr) "${str}\n arg ${builtins.toString nr} is \n ${builtins.toXML (builtins.seq arg arg)}" (expr arg)
+              traceCallXml (builtins.add 1 nr) "${str}\n arg ${builtins.toString nr} is \n ${builtins.toXML (strict arg)}" (expr arg)
            )
          else
-            let r = builtins.seq expr expr;
+            let r = strict expr;
            in trace "${str}\n result:\n${builtins.toXML r}" r
-      ));
+      );
 }
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -1,136 +1,31 @@
-/* Library of low-level helper functions for nix expressions.
- *
- * Please implement (mostly) exhaustive unit tests
- * for new functions in `./tests.nix'.
- */
-let
+let 

-  inherit (import ./fixed-points.nix {}) makeExtensible;
+  trivial = import ./trivial.nix;
+  lists = import ./lists.nix;
+  strings = import ./strings.nix;
+  stringsWithDeps = import ./strings-with-deps.nix;
+  attrsets = import ./attrsets.nix;
+  sources = import ./sources.nix;
+  modules = import ./modules.nix;
+  options = import ./options.nix;
+  types = import ./types.nix;
+  meta = import ./meta.nix;
+  debug = import ./debug.nix;
+  misc = import ./deprecated.nix;
+  maintainers = import ./maintainers.nix;
+  platforms = import ./platforms.nix;
+  systems = import ./systems.nix;
+  customisation = import ./customisation.nix;
+  licenses = import ./licenses.nix;
+  sandbox = import ./sandbox.nix;

-  lib = makeExtensible (self: let
-    callLibs = file: import file { lib = self; };
-  in with self; {
-
-    # often used, or depending on very little
-    trivial = callLibs ./trivial.nix;
-    fixedPoints = callLibs ./fixed-points.nix;
-
-    # datatypes
-    attrsets = callLibs ./attrsets.nix;
-    lists = callLibs ./lists.nix;
-    strings = callLibs ./strings.nix;
-    stringsWithDeps = callLibs ./strings-with-deps.nix;
-
-    # packaging
-    customisation = callLibs ./customisation.nix;
-    maintainers = import ../maintainers/maintainer-list.nix;
-    meta = callLibs ./meta.nix;
-    sources = callLibs ./sources.nix;
-    versions = callLibs ./versions.nix;
-
-    # module system
-    modules = callLibs ./modules.nix;
-    options = callLibs ./options.nix;
-    types = callLibs ./types.nix;
-
-    # constants
-    licenses = callLibs ./licenses.nix;
-    systems = callLibs ./systems;
-
-    # misc
-    debug = callLibs ./debug.nix;
-
-    generators = callLibs ./generators.nix;
-    misc = callLibs ./deprecated.nix;
-    # domain-specific
-    fetchers = callLibs ./fetchers.nix;
-
-    # Eval-time filesystem handling
-    filesystem = callLibs ./filesystem.nix;
-
-    # back-compat aliases
-    platforms = systems.forMeta;
-
-    inherit (builtins) add addErrorContext attrNames concatLists
-      deepSeq elem elemAt filter genericClosure genList getAttr
-      hasAttr head isAttrs isBool isInt isList isString length
-      lessThan listToAttrs pathExists readFile replaceStrings seq
-      stringLength sub substring tail;
-    inherit (trivial) id const concat or and bitAnd bitOr bitXor bitNot
-      boolToString mergeAttrs flip mapNullable inNixShell min max
-      importJSON warn info nixpkgsVersion version mod compare
-      splitByAndCompare functionArgs setFunctionArgs isFunction;
-
-    inherit (fixedPoints) fix fix' extends composeExtensions
-      makeExtensible makeExtensibleWithCustomName;
-    inherit (attrsets) attrByPath hasAttrByPath setAttrByPath
-      getAttrFromPath attrVals attrValues catAttrs filterAttrs
-      filterAttrsRecursive foldAttrs collect nameValuePair mapAttrs
-      mapAttrs' mapAttrsToList mapAttrsRecursive mapAttrsRecursiveCond
-      genAttrs isDerivation toDerivation optionalAttrs
-      zipAttrsWithNames zipAttrsWith zipAttrs recursiveUpdateUntil
-      recursiveUpdate matchAttrs overrideExisting getOutput getBin
-      getLib getDev chooseDevOutputs zipWithNames zip;
-    inherit (lists) singleton foldr fold foldl foldl' imap0 imap1
-      concatMap flatten remove findSingle findFirst any all count
-      optional optionals toList range partition zipListsWith zipLists
-      reverseList listDfs toposort sort naturalSort compareLists take
-      drop sublist last init crossLists unique intersectLists
-      subtractLists mutuallyExclusive groupBy groupBy';
-    inherit (strings) concatStrings concatMapStrings concatImapStrings
-      intersperse concatStringsSep concatMapStringsSep
-      concatImapStringsSep makeSearchPath makeSearchPathOutput
-      makeLibraryPath makeBinPath makePerlPath makeFullPerlPath optionalString
-      hasPrefix hasSuffix stringToCharacters stringAsChars escape
-      escapeShellArg escapeShellArgs replaceChars lowerChars
-      upperChars toLower toUpper addContextFrom splitString
-      removePrefix removeSuffix versionOlder versionAtLeast getVersion
-      nameFromURL enableFeature enableFeatureAs withFeature
-      withFeatureAs fixedWidthString fixedWidthNumber isStorePath
-      toInt readPathsFromFile fileContents;
-    inherit (stringsWithDeps) textClosureList textClosureMap
-      noDepEntry fullDepEntry packEntry stringAfter;
-    inherit (customisation) overrideDerivation makeOverridable
-      callPackageWith callPackagesWith extendDerivation hydraJob
-      makeScope;
-    inherit (meta) addMetaAttrs dontDistribute setName updateName
-      appendToName mapDerivationAttrset lowPrio lowPrioSet hiPrio
-      hiPrioSet;
-    inherit (sources) pathType pathIsDirectory cleanSourceFilter
-      cleanSource sourceByRegex sourceFilesBySuffices
-      commitIdFromGitRepo cleanSourceWith pathHasContext
-      canCleanSource;
-    inherit (modules) evalModules closeModules unifyModuleSyntax
-      applyIfFunction unpackSubmodule packSubmodule mergeModules
-      mergeModules' mergeOptionDecls evalOptionValue mergeDefinitions
-      pushDownProperties dischargeProperties filterOverrides
-      sortProperties fixupOptionType mkIf mkAssert mkMerge mkOverride
-      mkOptionDefault mkDefault mkForce mkVMOverride mkStrict
-      mkFixStrictness mkOrder mkBefore mkAfter mkAliasDefinitions
-      mkAliasAndWrapDefinitions fixMergeModules mkRemovedOptionModule
-      mkRenamedOptionModule mkMergedOptionModule mkChangedOptionModule
-      mkAliasOptionModule doRename filterModules;
-    inherit (options) isOption mkEnableOption mkSinkUndeclaredOptions
-      mergeDefaultOption mergeOneOption mergeEqualOption getValues
-      getFiles optionAttrSetToDocList optionAttrSetToDocList'
-      scrubOptionValue literalExample showOption showFiles
-      unknownModule mkOption;
-    inherit (types) isType setType defaultTypeMerge defaultFunctor
-      isOptionType mkOptionType;
-    inherit (debug) addErrorContextToAttrs traceIf traceVal traceValFn
-      traceXMLVal traceXMLValMarked traceSeq traceSeqN traceValSeq
-      traceValSeqFn traceValSeqN traceValSeqNFn traceShowVal
-      traceShowValMarked showVal traceCall traceCall2 traceCall3
-      traceValIfNot runTests testAllTrue traceCallXml attrNamesToStr;
-    inherit (misc) maybeEnv defaultMergeArg defaultMerge foldArgs
-      defaultOverridableDelayableArgs composedArgsAndFun
-      maybeAttrNullable maybeAttr ifEnable checkFlag getValue
-      checkReqs uniqList uniqListExt condConcat lazyGenericClosure
-      innerModifySumArgs modifySumArgs innerClosePropagation
-      closePropagation mapAttrsFlatten nvs setAttr setAttrMerge
-      mergeAttrsWithFunc mergeAttrsConcatenateValues
-      mergeAttrsNoOverride mergeAttrByFunc mergeAttrsByFuncDefaults
-      mergeAttrsByFuncDefaultsClean mergeAttrBy prepareDerivationArgs
-      nixType imap overridableDelayableArgs;
-  });
-in lib
+in
+  { inherit trivial lists strings stringsWithDeps attrsets sources options
+      modules types meta debug maintainers licenses platforms systems sandbox;
+  }
+  # !!! don't include everything at top-level; perhaps only the most
+  # commonly used functions.
+  // trivial // lists // strings // stringsWithDeps // attrsets // sources
+  // options // types // meta // debug // misc // modules
+  // systems
+  // customisation
--- a/lib/deprecated.nix
+++ b/lib/deprecated.nix
@@ -1,12 +1,11 @@
-{ lib }:
-let
-    inherit (builtins) head tail isList isAttrs isInt attrNames;
+let lib = import ./default.nix;
+    inherit (builtins) isFunction head tail isList isAttrs isInt attrNames;

 in

-with lib.lists;
-with lib.attrsets;
-with lib.strings;
+with import ./lists.nix;
+with import ./attrsets.nix;
+with import ./strings.nix;

 rec {

@@ -17,23 +16,23 @@ rec {

  defaultMergeArg = x : y: if builtins.isAttrs y then
    y
-  else
+  else 
    (y x);
  defaultMerge = x: y: x // (defaultMergeArg x y);
-  foldArgs = merger: f: init: x:
-    let arg = (merger init (defaultMergeArg init x));
-        # now add the function with composed args already applied to the final attrs
-        base = (setAttrMerge "passthru" {} (f arg)
-                        ( z: z // rec {
-                            function = foldArgs merger f arg;
-                            args = (lib.attrByPath ["passthru" "args"] {} z) // x;
+  foldArgs = merger: f: init: x: 
+    let arg=(merger init (defaultMergeArg init x));
+      # now add the function with composed args already applied to the final attrs
+        base = (setAttrMerge "passthru" {} (f arg) 
+                        ( z : z // rec { 
+                          function = foldArgs merger f arg; 
+			  args = (lib.attrByPath ["passthru" "args"] {} z) // x;
                          } ));
-        withStdOverrides = base // {
-          override = base.passthru.function;
-        };
+	withStdOverrides = base // {
+	   override = base.passthru.function;
+	   } ;
        in
-          withStdOverrides;
-
+	withStdOverrides;
+    

  # predecessors: proposed replacement for applyAndFun (which has a bug cause it merges twice)
  # the naming "overridableDelayableArgs" tries to express that you can
@@ -50,35 +49,35 @@ rec {
  #
  # examples: see test cases "res" below;
  overridableDelayableArgs =
-          f:        # the function applied to the arguments
-          initial:  # you pass attrs, the functions below are passing a function taking the fix argument
+          f :        # the function applied to the arguments
+          initial :  # you pass attrs, the functions below are passing a function taking the fix argument
    let
-        takeFixed = if lib.isFunction initial then initial else (fixed : initial); # transform initial to an expression always taking the fixed argument
-        tidy = args:
+        takeFixed = if isFunction initial then initial else (fixed : initial); # transform initial to an expression always taking the fixed argument
+        tidy = args : 
            let # apply all functions given in "applyPreTidy" in sequence
-                applyPreTidyFun = fold ( n: a: x: n ( a x ) ) lib.id (maybeAttr "applyPreTidy" [] args);
+                applyPreTidyFun = fold ( n : a : x : n ( a x ) ) lib.id (maybeAttr "applyPreTidy" [] args);
            in removeAttrs (applyPreTidyFun args) ( ["applyPreTidy"] ++ (maybeAttr  "removeAttrs" [] args) ); # tidy up args before applying them
-        fun = n: x:
-            let newArgs = fixed:
-                    let args = takeFixed fixed;
-                        mergeFun = args.${n};
-                    in if isAttrs x then (mergeFun args x)
-                       else assert lib.isFunction x;
-                            mergeFun args (x ( args // { inherit fixed; }));
-            in overridableDelayableArgs f newArgs;
+        fun = n : x :
+             let newArgs = fixed :
+                     let args = takeFixed fixed; 
+                         mergeFun = args.${n};
+                     in if isAttrs x then (mergeFun args x)
+                        else assert isFunction x;
+                             mergeFun args (x ( args // { inherit fixed; }));
+             in overridableDelayableArgs f newArgs;
    in
    (f (tidy (lib.fix takeFixed))) // {
      merge   = fun "mergeFun";
      replace = fun "keepFun";
    };
-  defaultOverridableDelayableArgs = f:
+  defaultOverridableDelayableArgs = f : 
      let defaults = {
            mergeFun = mergeAttrByFunc; # default merge function. merge strategie (concatenate lists, strings) is given by mergeAttrBy
-            keepFun = a: b: { inherit (a) removeAttrs mergeFun keepFun mergeAttrBy; } // b; # even when using replace preserve these values
+            keepFun = a : b : { inherit (a) removeAttrs mergeFun keepFun mergeAttrBy; } // b; # even when using replace preserve these values
            applyPreTidy = []; # list of functions applied to args before args are tidied up (usage case : prepareDerivationArgs)
            mergeAttrBy = mergeAttrBy // {
-              applyPreTidy = a: b: a ++ b;
-              removeAttrs = a: b: a ++ b;
+              applyPreTidy = a : b : a ++ b;
+              removeAttrs = a : b: a ++ b;
            };
            removeAttrs = ["mergeFun" "keepFun" "mergeAttrBy" "removeAttrs" "fixed" ]; # before applying the arguments to the function make sure these names are gone
          };
@@ -87,7 +86,7 @@ rec {


  # rec { # an example of how composedArgsAndFun can be used
-  #  a  = composedArgsAndFun (x: x) { a = ["2"]; meta = { d = "bar";}; };
+  #  a  = composedArgsAndFun (x : x) { a = ["2"]; meta = { d = "bar";}; };
  #  # meta.d will be lost ! It's your task to preserve it (eg using a merge function)
  #  b  = a.passthru.function { a = [ "3" ]; meta = { d2 = "bar2";}; };
  #  # instead of passing/ overriding values you can use a merge function:
@@ -120,7 +119,7 @@ rec {
    else if val == true || val == false then false
    else null;

-
+    
  # Return true only if there is an attribute and it is true.
  checkFlag = attrSet: name:
        if name == "true" then true else
@@ -135,29 +134,29 @@ rec {
  ( attrByPath [name] (if checkFlag attrSet name then true else
        if argList == [] then null else
        let x = builtins.head argList; in
-                if (head x) == name then
+                if (head x) == name then 
                        (head (tail x))
-                else (getValue attrSet
+                else (getValue attrSet 
                        (tail argList) name)) attrSet );

-
+                        
  # Input : attrSet, [[name default] ...], [ [flagname reqs..] ... ]
  # Output : are reqs satisfied? It's asserted.
-  checkReqs = attrSet: argList: condList:
+  checkReqs = attrSet : argList : condList :
  (
-    fold lib.and true
-      (map (x: let name = (head x); in
-
-        ((checkFlag attrSet name) ->
+    fold lib.and true 
+      (map (x: let name = (head x) ; in
+        
+        ((checkFlag attrSet name) -> 
        (fold lib.and true
        (map (y: let val=(getValue attrSet argList y); in
-                (val!=null) && (val!=false))
-        (tail x))))) condList));
-
+                (val!=null) && (val!=false)) 
+        (tail x))))) condList)) ;
+        

  # This function has O(n^2) performance.
-  uniqList = { inputList, acc ? [] }:
-    let go = xs: acc:
+  uniqList = {inputList, acc ? []} :
+    let go = xs : acc :
             if xs == []
             then []
             else let x = head xs;
@@ -165,26 +164,26 @@ rec {
                  in y ++ go (tail xs) (y ++ acc);
    in go inputList acc;

-  uniqListExt = { inputList,
-                  outputList ? [],
-                  getter ? (x: x),
-                  compare ? (x: y: x==y) }:
+  uniqListExt = {inputList, outputList ? [],
+    getter ? (x : x), compare ? (x: y: x==y)}:
        if inputList == [] then outputList else
-        let x = head inputList;
-            isX = y: (compare (getter y) (getter x));
-            newOutputList = outputList ++
-                (if any isX outputList then [] else [x]);
-        in uniqListExt { outputList = newOutputList;
-                         inputList = (tail inputList);
-                         inherit getter compare;
-                       };
+        let x=head inputList; 
+        isX = y: (compare (getter y) (getter x));
+        newOutputList = outputList ++
+         (if any isX outputList then [] else [x]);
+        in uniqListExt {outputList=newOutputList; 
+                inputList = (tail inputList);
+                inherit getter compare;
+                };

+
+                
  condConcat = name: list: checker:
        if list == [] then name else
-        if checker (head list) then
-                condConcat
-                        (name + (head (tail list)))
-                        (tail (tail list))
+        if checker (head list) then 
+                condConcat 
+                        (name + (head (tail list))) 
+                        (tail (tail list)) 
                        checker
        else condConcat
                name (tail (tail list)) checker;
@@ -203,12 +202,12 @@ rec {
    in
      work startSet [] [];

-  innerModifySumArgs = f: x: a: b: if b == null then (f a b) // x else
+  innerModifySumArgs = f: x: a: b: if b == null then (f a b) // x else 
        innerModifySumArgs f x (a // b);
  modifySumArgs = f: x: innerModifySumArgs f x {};


-  innerClosePropagation = acc: xs:
+  innerClosePropagation = acc : xs :
    if xs == []
    then acc
    else let y  = head xs;
@@ -228,45 +227,45 @@ rec {
  closePropagation = list: (uniqList {inputList = (innerClosePropagation [] list);});

  # calls a function (f attr value ) for each record item. returns a list
-  mapAttrsFlatten = f: r: map (attr: f attr r.${attr}) (attrNames r);
+  mapAttrsFlatten = f : r : map (attr: f attr r.${attr}) (attrNames r);

  # attribute set containing one attribute
-  nvs = name: value: listToAttrs [ (nameValuePair name value) ];
+  nvs = name : value : listToAttrs [ (nameValuePair name value) ];
  # adds / replaces an attribute of an attribute set
-  setAttr = set: name: v: set // (nvs name v);
+  setAttr = set : name : v : set // (nvs name v);

  # setAttrMerge (similar to mergeAttrsWithFunc but only merges the values of a particular name)
-  # setAttrMerge "a" [] { a = [2];} (x: x ++ [3]) -> { a = [2 3]; }
-  # setAttrMerge "a" [] {         } (x: x ++ [3]) -> { a = [  3]; }
-  setAttrMerge = name: default: attrs: f:
+  # setAttrMerge "a" [] { a = [2];} (x : x ++ [3]) -> { a = [2 3]; } 
+  # setAttrMerge "a" [] {         } (x : x ++ [3]) -> { a = [  3]; }
+  setAttrMerge = name : default : attrs : f :
    setAttr attrs name (f (maybeAttr name default attrs));

-  # Using f = a: b = b the result is similar to //
+  # Using f = a : b = b the result is similar to //
  # merge attributes with custom function handling the case that the attribute
  # exists in both sets
-  mergeAttrsWithFunc = f: set1: set2:
-    fold (n: set: if set ? ${n}
+  mergeAttrsWithFunc = f : set1 : set2 :
+    fold (n: set : if set ? ${n}
                        then setAttr set n (f set.${n} set2.${n})
                        else set )
           (set2 // set1) (attrNames set2);

  # merging two attribute set concatenating the values of same attribute names
  # eg { a = 7; } {  a = [ 2 3 ]; } becomes { a = [ 7 2 3 ]; }
-  mergeAttrsConcatenateValues = mergeAttrsWithFunc ( a: b: (toList a) ++ (toList b) );
+  mergeAttrsConcatenateValues = mergeAttrsWithFunc ( a : b : (toList a) ++ (toList b) );

-  # merges attributes using //, if a name exists in both attributes
+  # merges attributes using //, if a name exisits in both attributes
  # an error will be triggered unless its listed in mergeLists
  # so you can mergeAttrsNoOverride { buildInputs = [a]; } { buildInputs = [a]; } {} to get
  # { buildInputs = [a b]; }
-  # merging buildPhase doesn't really make sense. The cases will be rare where appending /prefixing will fit your needs?
+  # merging buildPhase does'nt really make sense. The cases will be rare where appending /prefixing will fit your needs?
  # in these cases the first buildPhase will override the second one
  # ! deprecated, use mergeAttrByFunc instead
  mergeAttrsNoOverride = { mergeLists ? ["buildInputs" "propagatedBuildInputs"],
                           overrideSnd ? [ "buildPhase" ]
-                         }: attrs1: attrs2:
-    fold (n: set:
+                         } : attrs1 : attrs2 :
+    fold (n: set : 
        setAttr set n ( if set ? ${n}
-            then # merge
+            then # merge 
              if elem n mergeLists # attribute contains list, merge them by concatenating
                then attrs2.${n} ++ attrs1.${n}
              else if elem n overrideSnd
@@ -287,14 +286,14 @@ rec {
  # { mergeAttrsBy = [...]; buildInputs = [ a b c d ]; }
  # is used by prepareDerivationArgs, defaultOverridableDelayableArgs and can be used when composing using
  # foldArgs, composedArgsAndFun or applyAndFun. Example: composableDerivation in all-packages.nix
-  mergeAttrByFunc = x: y:
+  mergeAttrByFunc = x : y :
    let
-          mergeAttrBy2 = { mergeAttrBy = lib.mergeAttrs; }
+          mergeAttrBy2 = { mergeAttrBy=lib.mergeAttrs; }
                      // (maybeAttr "mergeAttrBy" {} x)
                      // (maybeAttr "mergeAttrBy" {} y); in
    fold lib.mergeAttrs {} [
      x y
-      (mapAttrs ( a: v: # merge special names using given functions
+      (mapAttrs ( a : v : # merge special names using given functions
          if x ? ${a}
             then if y ? ${a}
               then v x.${a} y.${a} # both have attr, use merge func
@@ -310,19 +309,58 @@ rec {
  mergeAttrsByFuncDefaults = foldl mergeAttrByFunc { inherit mergeAttrBy; };
  mergeAttrsByFuncDefaultsClean = list: removeAttrs (mergeAttrsByFuncDefaults list) ["mergeAttrBy"];

+  # merge attrs based on version key into mkDerivation args, see mergeAttrBy to learn about smart merge defaults
+  #
+  # This function is best explained by an example:
+  #
+  #     {version ? "2.x"} :
+  #
+  #     mkDerivation (mergeAttrsByVersion "package-name" version 
+  #       { # version specific settings
+  #         "git" = { src = ..; preConfigre = "autogen.sh"; buildInputs = [automake autoconf libtool];  };
+  #         "2.x" = { src = ..; };
+  #       }
+  #       {  // shared settings
+  #          buildInputs = [ common build inputs ];
+  #          meta = { .. }
+  #       }
+  #     )
+  #
+  # Please note that e.g. Eelco Dolstra usually prefers having one file for
+  # each version. On the other hand there are valuable additional design goals
+  #  - readability
+  #  - do it once only
+  #  - try to avoid duplication
+  #
+  # Marc Weber and Michael Raskin sometimes prefer keeping older
+  # versions around for testing and regression tests - as long as its cheap to
+  # do so.
+  #
+  # Very often it just happens that the "shared" code is the bigger part.
+  # Then using this function might be appropriate.
+  #
+  # Be aware that its easy to cause recompilations in all versions when using
+  # this function - also if derivations get too complex splitting into multiple
+  # files is the way to go.
+  #
+  # See misc.nix -> versionedDerivation
+  # discussion: nixpkgs: pull/310
+  mergeAttrsByVersion = name: version: attrsByVersion: base:
+    mergeAttrsByFuncDefaultsClean [ { name = "${name}-${version}"; } base (maybeAttr version (throw "bad version ${version} for ${name}") attrsByVersion)];
+
  # sane defaults (same name as attr name so that inherit can be used)
  mergeAttrBy = # { buildInputs = concatList; [...]; passthru = mergeAttr; [..]; }
-    listToAttrs (map (n: nameValuePair n lib.concat)
+    listToAttrs (map (n : nameValuePair n lib.concat)
      [ "nativeBuildInputs" "buildInputs" "propagatedBuildInputs" "configureFlags" "prePhases" "postAll" "patches" ])
-    // listToAttrs (map (n: nameValuePair n lib.mergeAttrs) [ "passthru" "meta" "cfg" "flags" ])
-    // listToAttrs (map (n: nameValuePair n (a: b: "${a}\n${b}") ) [ "preConfigure" "postInstall" ])
+    // listToAttrs (map (n : nameValuePair n lib.mergeAttrs) [ "passthru" "meta" "cfg" "flags" ])
+    // listToAttrs (map (n : nameValuePair n (a: b: "${a}\n${b}") ) [ "preConfigure" "postInstall" ])
  ;

  # prepareDerivationArgs tries to make writing configurable derivations easier
  # example:
  #  prepareDerivationArgs {
  #    mergeAttrBy = {
-  #       myScript = x: y: x ++ "\n" ++ y;
+  #       myScript = x : y : x ++ "\n" ++ y;
  #    };
  #    cfg = {
  #      readlineSupport = true;
@@ -354,10 +392,10 @@ rec {
  # TODO use args.mergeFun here as well?
  prepareDerivationArgs = args:
    let args2 = { cfg = {}; flags = {}; } // args;
-        flagName = name: "${name}Support";
-        cfgWithDefaults = (listToAttrs (map (n: nameValuePair (flagName n) false) (attrNames args2.flags)))
+        flagName = name : "${name}Support";
+        cfgWithDefaults = (listToAttrs (map (n : nameValuePair (flagName n) false) (attrNames args2.flags)))
                          // args2.cfg;
-        opts = attrValues (mapAttrs (a: v:
+        opts = attrValues (mapAttrs (a : v :
                let v2 = if v ? set || v ? unset then v else { set = v; };
                    n = if cfgWithDefaults.${flagName a} then "set" else "unset";
                    attr = maybeAttr n {} v2; in
@@ -374,7 +412,7 @@ rec {
      if isAttrs x then
          if x ? outPath then "derivation"
          else "attrs"
-      else if lib.isFunction x then "function"
+      else if isFunction x then "function"
      else if isList x then "list"
      else if x == true then "bool"
      else if x == false then "bool"
@@ -382,12 +420,4 @@ rec {
      else if isInt x then "int"
      else "string";

-  /* deprecated:
-
-     For historical reasons, imap has an index starting at 1.
-
-     But for consistency with the rest of the library we want an index
-     starting at zero.
-  */
-  imap = imap1;
 }
--- a/lib/fetchers.nix
+++ b/lib/fetchers.nix
@@ -1,13 +0,0 @@
-# snippets that can be shared by multiple fetchers (pkgs/build-support)
-{ lib }:
-{
-
-  proxyImpureEnvVars = [
-    # We borrow these environment variables from the caller to allow
-    # easy proxy configuration.  This is impure, but a fixed-output
-    # derivation like fetchurl is allowed to do so since its result is
-    # by definition pure.
-    "http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
-  ];
-
-}
--- a/lib/filesystem.nix
+++ b/lib/filesystem.nix
@@ -1,45 +0,0 @@
-{ lib }:
-{ # haskellPathsInDir : Path -> Map String Path
-  # A map of all haskell packages defined in the given path,
-  # identified by having a cabal file with the same name as the
-  # directory itself.
-  haskellPathsInDir = root:
-    let # Files in the root
-        root-files = builtins.attrNames (builtins.readDir root);
-        # Files with their full paths
-        root-files-with-paths =
-          map (file:
-            { name = file; value = root + "/${file}"; }
-          ) root-files;
-        # Subdirectories of the root with a cabal file.
-        cabal-subdirs =
-          builtins.filter ({ name, value }:
-            builtins.pathExists (value + "/${name}.cabal")
-          ) root-files-with-paths;
-    in builtins.listToAttrs cabal-subdirs;
-  # locateDominatingFile :  RegExp
-  #                      -> Path
-  #                      -> Nullable { path : Path;
-  #                                    matches : [ MatchResults ];
-  #                                  }
-  # Find the first directory containing a file matching 'pattern'
-  # upward from a given 'file'.
-  # Returns 'null' if no directories contain a file matching 'pattern'.
-  locateDominatingFile = pattern: file:
-    let go = path:
-          let files = builtins.attrNames (builtins.readDir path);
-              matches = builtins.filter (match: match != null)
-                          (map (builtins.match pattern) files);
-          in
-            if builtins.length matches != 0
-              then { inherit path matches; }
-              else if path == /.
-                then null
-                else go (dirOf path);
-        parent = dirOf file;
-        isDir =
-          let base = baseNameOf file;
-              type = (builtins.readDir parent).${base} or null;
-          in file == /. || type == "directory";
-    in go (if isDir then file else parent);
-}
--- a/lib/fixed-points.nix
+++ b/lib/fixed-points.nix
@@ -1,79 +0,0 @@
-{ ... }:
-rec {
-  # Compute the fixed point of the given function `f`, which is usually an
-  # attribute set that expects its final, non-recursive representation as an
-  # argument:
-  #
-  #     f = self: { foo = "foo"; bar = "bar"; foobar = self.foo + self.bar; }
-  #
-  # Nix evaluates this recursion until all references to `self` have been
-  # resolved. At that point, the final result is returned and `f x = x` holds:
-  #
-  #     nix-repl> fix f
-  #     { bar = "bar"; foo = "foo"; foobar = "foobar"; }
-  #
-  #  Type: fix :: (a -> a) -> a
-  #
-  # See https://en.wikipedia.org/wiki/Fixed-point_combinator for further
-  # details.
-  fix = f: let x = f x; in x;
-
-  # A variant of `fix` that records the original recursive attribute set in the
-  # result. This is useful in combination with the `extends` function to
-  # implement deep overriding. See pkgs/development/haskell-modules/default.nix
-  # for a concrete example.
-  fix' = f: let x = f x // { __unfix__ = f; }; in x;
-
-  # Modify the contents of an explicitly recursive attribute set in a way that
-  # honors `self`-references. This is accomplished with a function
-  #
-  #     g = self: super: { foo = super.foo + " + "; }
-  #
-  # that has access to the unmodified input (`super`) as well as the final
-  # non-recursive representation of the attribute set (`self`). `extends`
-  # differs from the native `//` operator insofar as that it's applied *before*
-  # references to `self` are resolved:
-  #
-  #     nix-repl> fix (extends g f)
-  #     { bar = "bar"; foo = "foo + "; foobar = "foo + bar"; }
-  #
-  # The name of the function is inspired by object-oriented inheritance, i.e.
-  # think of it as an infix operator `g extends f` that mimics the syntax from
-  # Java. It may seem counter-intuitive to have the "base class" as the second
-  # argument, but it's nice this way if several uses of `extends` are cascaded.
-  extends = f: rattrs: self: let super = rattrs self; in super // f self super;
-
-  # Compose two extending functions of the type expected by 'extends'
-  # into one where changes made in the first are available in the
-  # 'super' of the second
-  composeExtensions =
-    f: g: self: super:
-      let fApplied = f self super;
-          super' = super // fApplied;
-      in fApplied // g self super';
-
-  # Create an overridable, recursive attribute set. For example:
-  #
-  #     nix-repl> obj = makeExtensible (self: { })
-  #
-  #     nix-repl> obj
-  #     { __unfix__ = «lambda»; extend = «lambda»; }
-  #
-  #     nix-repl> obj = obj.extend (self: super: { foo = "foo"; })
-  #
-  #     nix-repl> obj
-  #     { __unfix__ = «lambda»; extend = «lambda»; foo = "foo"; }
-  #
-  #     nix-repl> obj = obj.extend (self: super: { foo = super.foo + " + "; bar = "bar"; foobar = self.foo + self.bar; })
-  #
-  #     nix-repl> obj
-  #     { __unfix__ = «lambda»; bar = "bar"; extend = «lambda»; foo = "foo + "; foobar = "foo + bar"; }
-  makeExtensible = makeExtensibleWithCustomName "extend";
-
-  # Same as `makeExtensible` but the name of the extending attribute is
-  # customized.
-  makeExtensibleWithCustomName = extenderName: rattrs:
-    fix' rattrs // {
-      ${extenderName} = f: makeExtensibleWithCustomName extenderName (extends f rattrs);
-   };
-}
--- a/lib/generators.nix
+++ b/lib/generators.nix
@@ -1,226 +0,0 @@
-/* Functions that generate widespread file
- * formats from nix data structures.
- *
- * They all follow a similar interface:
- * generator { config-attrs } data
- *
- * `config-attrs` are “holes” in the generators
- * with sensible default implementations that
- * can be overwritten. The default implementations
- * are mostly generators themselves, called with
- * their respective default values; they can be reused.
- *
- * Tests can be found in ./tests.nix
- * Documentation in the manual, #sec-generators
- */
-{ lib }:
-with (lib).trivial;
-let
-  libStr = lib.strings;
-  libAttr = lib.attrsets;
-
-  inherit (lib) isFunction;
-in
-
-rec {
-
-  ## -- HELPER FUNCTIONS & DEFAULTS --
-
-  /* Convert a value to a sensible default string representation.
-   * The builtin `toString` function has some strange defaults,
-   * suitable for bash scripts but not much else.
-   */
-  mkValueStringDefault = {}: v: with builtins;
-    let err = t: v: abort
-          ("generators.mkValueStringDefault: " +
-           "${t} not supported: ${toPretty {} v}");
-    in   if isInt      v then toString v
-    # we default to not quoting strings
-    else if isString   v then v
-    # isString returns "1", which is not a good default
-    else if true  ==   v then "true"
-    # here it returns to "", which is even less of a good default
-    else if false ==   v then "false"
-    else if null  ==   v then "null"
-    # if you have lists you probably want to replace this
-    else if isList     v then err "lists" v
-    # same as for lists, might want to replace
-    else if isAttrs    v then err "attrsets" v
-    else if isFunction v then err "functions" v
-    else err "this value is" (toString v);
-
-
-  /* Generate a line of key k and value v, separated by
-   * character sep. If sep appears in k, it is escaped.
-   * Helper for synaxes with different separators.
-   *
-   * mkValueString specifies how values should be formatted.
-   *
-   * mkKeyValueDefault {} ":" "f:oo" "bar"
-   * > "f\:oo:bar"
-   */
-  mkKeyValueDefault = {
-    mkValueString ? mkValueStringDefault {}
-  }: sep: k: v:
-    "${libStr.escape [sep] k}${sep}${mkValueString v}";
-
-
-  ## -- FILE FORMAT GENERATORS --
-
-
-  /* Generate a key-value-style config file from an attrset.
-   *
-   * mkKeyValue is the same as in toINI.
-   */
-  toKeyValue = {
-    mkKeyValue ? mkKeyValueDefault {} "="
-  }: attrs:
-    let mkLine = k: v: mkKeyValue k v + "\n";
-    in libStr.concatStrings (libAttr.mapAttrsToList mkLine attrs);
-
-
-  /* Generate an INI-style config file from an
-   * attrset of sections to an attrset of key-value pairs.
-   *
-   * generators.toINI {} {
-   *   foo = { hi = "${pkgs.hello}"; ciao = "bar"; };
-   *   baz = { "also, integers" = 42; };
-   * }
-   *
-   *> [baz]
-   *> also, integers=42
-   *>
-   *> [foo]
-   *> ciao=bar
-   *> hi=/nix/store/y93qql1p5ggfnaqjjqhxcw0vqw95rlz0-hello-2.10
-   *
-   * The mk* configuration attributes can generically change
-   * the way sections and key-value strings are generated.
-   *
-   * For more examples see the test cases in ./tests.nix.
-   */
-  toINI = {
-    # apply transformations (e.g. escapes) to section names
-    mkSectionName ? (name: libStr.escape [ "[" "]" ] name),
-    # format a setting line from key and value
-    mkKeyValue    ? mkKeyValueDefault {} "="
-  }: attrsOfAttrs:
-    let
-        # map function to string for each key val
-        mapAttrsToStringsSep = sep: mapFn: attrs:
-          libStr.concatStringsSep sep
-            (libAttr.mapAttrsToList mapFn attrs);
-        mkSection = sectName: sectValues: ''
-          [${mkSectionName sectName}]
-        '' + toKeyValue { inherit mkKeyValue; } sectValues;
-    in
-      # map input to ini sections
-      mapAttrsToStringsSep "\n" mkSection attrsOfAttrs;
-
-
-  /* Generates JSON from an arbitrary (non-function) value.
-    * For more information see the documentation of the builtin.
-    */
-  toJSON = {}: builtins.toJSON;
-
-
-  /* YAML has been a strict superset of JSON since 1.2, so we
-    * use toJSON. Before it only had a few differences referring
-    * to implicit typing rules, so it should work with older
-    * parsers as well.
-    */
-  toYAML = {}@args: toJSON args;
-
-
-  /* Pretty print a value, akin to `builtins.trace`.
-    * Should probably be a builtin as well.
-    */
-  toPretty = {
-    /* If this option is true, attrsets like { __pretty = fn; val = …; }
-       will use fn to convert val to a pretty printed representation.
-       (This means fn is type Val -> String.) */
-    allowPrettyValues ? false
-  }@args: v: with builtins;
-    let     isPath   = v: typeOf v == "path";
-    in if   isInt      v then toString v
-    else if isString   v then ''"${libStr.escape [''"''] v}"''
-    else if true  ==   v then "true"
-    else if false ==   v then "false"
-    else if null  ==   v then "null"
-    else if isPath     v then toString v
-    else if isList     v then "[ "
-        + libStr.concatMapStringsSep " " (toPretty args) v
-      + " ]"
-    else if isAttrs    v then
-      # apply pretty values if allowed
-      if attrNames v == [ "__pretty" "val" ] && allowPrettyValues
-         then v.__pretty v.val
-      # TODO: there is probably a better representation?
-      else if v ? type && v.type == "derivation" then
-        "<δ:${v.name}>"
-        # "<δ:${concatStringsSep "," (builtins.attrNames v)}>"
-      else "{ "
-          + libStr.concatStringsSep " " (libAttr.mapAttrsToList
-              (name: value:
-                "${toPretty args name} = ${toPretty args value};") v)
-        + " }"
-    else if isFunction v then
-      let fna = lib.functionArgs v;
-          showFnas = concatStringsSep "," (libAttr.mapAttrsToList
-                       (name: hasDefVal: if hasDefVal then "(${name})" else name)
-                       fna);
-      in if fna == {}    then "<λ>"
-                         else "<λ:{${showFnas}}>"
-    else abort "generators.toPretty: should never happen (v = ${v})";
-
-  # PLIST handling
-  toPlist = {}: v: let
-    isFloat = builtins.isFloat or (x: false);
-    expr = ind: x:  with builtins;
-      if isNull x   then "" else
-      if isBool x   then bool ind x else
-      if isInt x    then int ind x else
-      if isString x then str ind x else
-      if isList x   then list ind x else
-      if isAttrs x  then attrs ind x else
-      if isFloat x  then float ind x else
-      abort "generators.toPlist: should never happen (v = ${v})";
-
-    literal = ind: x: ind + x;
-
-    bool = ind: x: literal ind  (if x then "<true/>" else "<false/>");
-    int = ind: x: literal ind "<integer>${toString x}</integer>";
-    str = ind: x: literal ind "<string>${x}</string>";
-    key = ind: x: literal ind "<key>${x}</key>";
-    float = ind: x: literal ind "<real>${toString x}</real>";
-
-    indent = ind: expr "\t${ind}";
-
-    item = ind: libStr.concatMapStringsSep "\n" (indent ind);
-
-    list = ind: x: libStr.concatStringsSep "\n" [
-      (literal ind "<array>")
-      (item ind x)
-      (literal ind "</array>")
-    ];
-
-    attrs = ind: x: libStr.concatStringsSep "\n" [
-      (literal ind "<dict>")
-      (attr ind x)
-      (literal ind "</dict>")
-    ];
-
-    attr = let attrFilter = name: value: name != "_module" && value != null;
-    in ind: x: libStr.concatStringsSep "\n" (lib.flatten (lib.mapAttrsToList
-      (name: value: lib.optional (attrFilter name value) [
-      (key "\t${ind}" name)
-      (expr "\t${ind}" value)
-    ]) x));
-
-  in ''<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-${expr "" v}
-</plist>'';
-
-}
--- a/lib/kernel.nix
+++ b/lib/kernel.nix
@@ -1,57 +0,0 @@
-{ lib
-# we pass the kernel version here to keep a nice syntax `whenOlder "4.13"`
-# kernelVersion, e.g., config.boot.kernelPackages.version
-, version
-, mkValuePreprocess ? null
-}:
-
-with lib;
-rec {
-  # Common patterns
-  when        = cond: opt: if cond then opt else null;
-  whenAtLeast = ver: when (versionAtLeast version ver);
-  whenOlder   = ver: when (versionOlder version ver);
-  whenBetween = verLow: verHigh: when (versionAtLeast version verLow && versionOlder version verHigh);
-
-  # Keeping these around in case we decide to change this horrible implementation :)
-  option = x: if x == null then null else "?${x}";
-  yes    = "y";
-  no     = "n";
-  module = "m";
-
-  mkValue = val:
-  let
-    isNumber = c: elem c ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9"];
-  in
-    if val == "" then "\"\""
-    else if val == yes || val == module || val == no then val
-    else if all isNumber (stringToCharacters val) then val
-    else if substring 0 2 val == "0x" then val
-    else val; # FIXME: fix quoting one day
-
-
-  # generate nix intermediate kernel config file of the form
-  #
-  #       VIRTIO_MMIO m
-  #       VIRTIO_BLK y
-  #       VIRTIO_CONSOLE n
-  #       NET_9P_VIRTIO? y
-  #
-  # Use mkValuePreprocess to preprocess option values, aka mark 'modules' as
-  # 'yes' or vice-versa
-  # Borrowed from copumpkin https://github.com/NixOS/nixpkgs/pull/12158
-  # returns a string, expr should be an attribute set
-  generateNixKConf = exprs: mkValuePreprocess:
-  let
-    mkConfigLine = key: rawval:
-    let
-      val = if builtins.isFunction mkValuePreprocess then mkValuePreprocess rawval else rawval;
-    in
-      if val == null
-        then ""
-        else if hasPrefix "?" val
-          then "${key}? ${mkValue (removePrefix "?" val)}\n"
-          else "${key} ${mkValue val}\n";
-    mkConf = cfg: concatStrings (mapAttrsToList mkConfigLine cfg);
-  in mkConf exprs;
-}
--- a/lib/licenses.nix
+++ b/lib/licenses.nix
@@ -1,8 +1,9 @@
-{ lib }:
 let

+  lib = import ./default.nix;
+
  spdx = lic: lic // {
-    url = "http://spdx.org/licenses/${lic.spdxId}.html";
+    url = "http://spdx.org/licenses/${lic.spdxId}";
  };

 in
@@ -15,12 +16,7 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {

  afl21 = spdx {
    spdxId = "AFL-2.1";
-    fullName = "Academic Free License v2.1";
-  };
-
-  afl3 = spdx {
-    spdxId = "AFL-3.0";
-    fullName = "Academic Free License v3.0";
+    fullName = "Academic Free License";
  };

  agpl3 = spdx {
@@ -42,7 +38,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
  amd = {
    fullName = "AMD License Agreement";
    url = http://developer.amd.com/amd-license-agreement/;
-    free = false;
  };

  apsl20 = spdx {
@@ -50,11 +45,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "Apple Public Source License 2.0";
  };

-  arphicpl = {
-    fullName = "Arphic Public License";
-    url = https://www.freedesktop.org/wiki/Arphic_Public_License/;
-  };
-
  artistic1 = spdx {
    spdxId = "Artistic-1.0";
    fullName = "Artistic License 1.0";
@@ -75,16 +65,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "Boost Software License 1.0";
  };

-  beerware = spdx {
-    spdxId = "Beerware";
-    fullName = ''Beerware License'';
-  };
-
-  bsd0 = spdx {
-    spdxId = "0BSD";
-    fullName = "BSD Zero Clause License";
-  };
-
  bsd2 = spdx {
    spdxId = "BSD-2-Clause";
    fullName = ''BSD 2-clause "Simplified" License'';
@@ -100,17 +80,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = ''BSD 4-clause "Original" or "Old" License'';
  };

-  bsl11 = {
-    fullName = "Business Source License 1.1";
-    url = https://mariadb.com/bsl11;
-    free = false;
-  };
-
-  clArtistic = spdx {
-    spdxId = "ClArtistic";
-    fullName = "Clarified Artistic License";
-  };
-
  cc0 = spdx {
    spdxId = "CC0-1.0";
    fullName = "Creative Commons Zero v1.0 Universal";
@@ -119,37 +88,21 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
  cc-by-nc-sa-20 = spdx {
    spdxId = "CC-BY-NC-SA-2.0";
    fullName = "Creative Commons Attribution Non Commercial Share Alike 2.0";
-    free = false;
  };

  cc-by-nc-sa-25 = spdx {
    spdxId = "CC-BY-NC-SA-2.5";
    fullName = "Creative Commons Attribution Non Commercial Share Alike 2.5";
-    free = false;
  };

  cc-by-nc-sa-30 = spdx {
    spdxId = "CC-BY-NC-SA-3.0";
    fullName = "Creative Commons Attribution Non Commercial Share Alike 3.0";
-    free = false;
  };

  cc-by-nc-sa-40 = spdx {
    spdxId = "CC-BY-NC-SA-4.0";
    fullName = "Creative Commons Attribution Non Commercial Share Alike 4.0";
-    free = false;
-  };
-
-  cc-by-nc-40 = spdx {
-    spdxId = "CC-BY-NC-4.0";
-    fullName = "Creative Commons Attribution Non Commercial 4.0 International";
-    free = false;
-  };
-
-  cc-by-nd-30 = spdx {
-    spdxId = "CC-BY-ND-3.0";
-    fullName = "Creative Commons Attribution-No Derivative Works v3.00";
-    free = false;
  };

  cc-by-sa-25 = spdx {
@@ -197,32 +150,16 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName  = "CeCILL-C Free Software License Agreement";
  };

-  cpal10 = spdx {
-    spdxId = "CPAL-1.0";
-    fullName = "Common Public Attribution License 1.0";
-  };
-
  cpl10 = spdx {
    spdxId = "CPL-1.0";
    fullName = "Common Public License 1.0";
  };

-  curl = {
-    fullName = "MIT/X11 derivate";
-    url = "https://curl.haxx.se/docs/copyright.html";
-  };
-
  doc = spdx {
    spdxId = "DOC";
    fullName = "DOC License";
  };

-  eapl = {
-    fullName = "EPSON AVASYS PUBLIC LICENSE";
-    url = http://avasys.jp/hp/menu000000700/hpg000000603.htm;
-    free = false;
-  };
-
  efl10 = spdx {
    spdxId = "EFL-1.0";
    fullName = "Eiffel Forum License v1.0";
@@ -233,33 +170,11 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "Eiffel Forum License v2.0";
  };

-  elastic = {
-    fullName = "ELASTIC LICENSE";
-    url = https://github.com/elastic/elasticsearch/blob/master/licenses/ELASTIC-LICENSE.txt;
-    free = false;
-  };
-
  epl10 = spdx {
    spdxId = "EPL-1.0";
    fullName = "Eclipse Public License 1.0";
  };

-  epl20 = spdx {
-    spdxId = "EPL-2.0";
-    fullName = "Eclipse Public License 2.0";
-  };
-
-  epson = {
-    fullName = "Seiko Epson Corporation Software License Agreement for Linux";
-    url = https://download.ebz.epson.net/dsc/du/02/eula/global/LINUX_EN.html;
-    free = false;
-  };
-
-  eupl11 = spdx {
-    spdxId = "EUPL-1.1";
-    fullName = "European Union Public License 1.1";
-  };
-
  fdl12 = spdx {
    spdxId = "GFDL-1.2";
    fullName = "GNU Free Documentation License v1.2";
@@ -267,30 +182,13 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {

  fdl13 = spdx {
    spdxId = "GFDL-1.3";
-    fullName = "GNU Free Documentation License v1.3";
-  };
-
-  ffsl = {
-    fullName = "Floodgap Free Software License";
-    url = http://www.floodgap.com/software/ffsl/license.html;
-    free = false;
+    fullName = "GNU Free Documentation License v1.2";
  };

  free = {
    fullName = "Unspecified free software license";
  };

-  g4sl = {
-    fullName = "Geant4 Software License";
-    url = https://geant4.web.cern.ch/geant4/license/LICENSE.html;
-  };
-
-  geogebra = {
-    fullName = "GeoGebra Non-Commercial License Agreement";
-    url = https://www.geogebra.org/license;
-    free = false;
-  };
-
  gpl1 = spdx {
    spdxId = "GPL-1.0";
    fullName = "GNU General Public License v1.0 only";
@@ -306,12 +204,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "GNU General Public License v2.0 only";
  };

-  gpl2Classpath = {
-    spdxId = "GPL-2.0-with-classpath-exception";
-    fullName = "GNU General Public License v2.0 only (with Classpath exception)";
-    url = https://fedoraproject.org/wiki/Licensing/GPL_Classpath_Exception;
-  };
-
  gpl2ClasspathPlus = {
    fullName = "GNU General Public License v2.0 or later (with Classpath exception)";
    url = https://fedoraproject.org/wiki/Licensing/GPL_Classpath_Exception;
@@ -319,7 +211,7 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {

  gpl2Oss = {
    fullName = "GNU General Public License version 2 only (with OSI approved licenses linking exception)";
-    url = https://www.mysql.com/about/legal/licensing/foss-exception;
+    url = http://www.mysql.com/about/legal/licensing/foss-exception;
  };

  gpl2Plus = spdx {
@@ -342,11 +234,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    url = https://fedoraproject.org/wiki/Licensing/GPL_Classpath_Exception;
  };

-  hpnd = spdx {
-    spdxId = "HPND";
-    fullName = "Historic Permission Notice and Disclaimer";
-  };
-
  # Intel's license, seems free
  iasl = {
    fullName = "iASL";
@@ -358,21 +245,9 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "Independent JPEG Group License";
  };

-  imagemagick = spdx {
-    fullName = "ImageMagick License";
-    spdxId = "imagemagick";
-  };
-
-  inria-compcert = {
-    fullName  = "INRIA Non-Commercial License Agreement for the CompCert verified compiler";
+  inria = {
+    fullName  = "INRIA Non-Commercial License Agreement";
    url       = "http://compcert.inria.fr/doc/LICENSE";
-    free      = false;
-  };
-
-  inria-icesl = {
-    fullName = "INRIA Non-Commercial License Agreement for IceSL";
-    url      = "http://shapeforge.loria.fr/icesl/EULA_IceSL_binary.pdf";
-    free     = false;
  };

  ipa = spdx {
@@ -450,11 +325,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "Lucent Public License v1.02";
  };

-  miros = {
-    fullName = "MirOS License";
-    url = https://opensource.org/licenses/MirOS;
-  };
-
  # spdx.org does not (yet) differentiate between the X11 and Expat versions
  # for details see http://en.wikipedia.org/wiki/MIT_License#Various_versions
  mit = spdx {
@@ -477,15 +347,9 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "Mozilla Public License 2.0";
  };

-  mspl = spdx {
-    spdxId = "MS-PL";
-    fullName = "Microsoft Public License";
-  };
-
  msrla = {
    fullName  = "Microsoft Research License Agreement";
    url       = "http://research.microsoft.com/en-us/projects/pex/msr-la.txt";
-    free = false;
  };

  ncsa = spdx {
@@ -497,12 +361,7 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    url = "https://raw.githubusercontent.com/raboof/notion/master/LICENSE";
    fullName = "Notion modified LGPL";
  };
-
-  nposl3 = spdx {
-    spdxId = "NPOSL-3.0";
-    fullName = "Non-Profit Open Software License 3.0";
-  };
-
+  
  ofl = spdx {
    spdxId = "OFL-1.1";
    fullName = "SIL Open Font License 1.1";
@@ -518,16 +377,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "OpenSSL License";
  };

-  osl21 = spdx {
-    spdxId = "OSL-2.1";
-    fullName = "Open Software License 2.1";
-  };
-
-  osl3 = spdx {
-    spdxId = "OSL-3.0";
-    fullName = "Open Software License 3.0";
-  };
-
  php301 = spdx {
    spdxId = "PHP-3.01";
    fullName = "PHP License v3.01";
@@ -538,12 +387,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "PostgreSQL License";
  };

-  postman = {
-    fullName = "Postman EULA";
-    url = https://www.getpostman.com/licenses/postman_base_app;
-    free = false;
-  };
-
  psfl = spdx {
    spdxId = "Python-2.0";
    fullName = "Python Software Foundation License version 2";
@@ -579,12 +422,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "Sleepycat License";
  };

-  smail = {
-    shortName = "smail";
-    fullName = "SMAIL General Public License";
-    url = http://metadata.ftp-master.debian.org/changelogs/main/d/debianutils/debianutils_4.8.1_copyright;
-  };
-
  tcltk = spdx {
    spdxId = "TCL";
    fullName = "TCL/TK License";
@@ -616,32 +453,16 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "The Unlicense";
  };

-  upl = {
-    fullName = "Universal Permissive License";
-    url = "https://oss.oracle.com/licenses/upl/";
-  };
-
  vim = spdx {
    spdxId = "Vim";
    fullName = "Vim License";
  };

-  virtualbox-puel = {
-    fullName = "Oracle VM VirtualBox Extension Pack Personal Use and Evaluation License (PUEL)";
-    url = "https://www.virtualbox.org/wiki/VirtualBox_PUEL";
-    free = false;
-  };
-
  vsl10 = spdx {
    spdxId = "VSL-1.0";
    fullName = "Vovida Software License v1.0";
  };

-  watcom = spdx {
-    spdxId = "Watcom-1.0";
-    fullName = "Sybase Open Watcom Public License 1.0";
-  };
-
  w3c = spdx {
    spdxId = "W3C";
    fullName = "W3C Software Notice and License";
@@ -657,28 +478,19 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
    fullName = "Do What The F*ck You Want To Public License";
  };

-  wxWindows = spdx {
-    spdxId = "WXwindows";
-    fullName = "wxWindows Library Licence, Version 3.1";
-  };
-
-  xfig = {
-    fullName = "xfig";
-    url = "http://mcj.sourceforge.net/authors.html#xfig";
-  };
-
  zlib = spdx {
    spdxId = "Zlib";
    fullName = "zlib License";
  };

-  zpl20 = spdx {
+  zpt20 = spdx { # FIXME: why zpt* instead of zpl*
    spdxId = "ZPL-2.0";
    fullName = "Zope Public License 2.0";
  };

-  zpl21 = spdx {
+  zpt21 = spdx {
    spdxId = "ZPL-2.1";
    fullName = "Zope Public License 2.1";
  };
+
 }
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -1,42 +1,23 @@
 # General list operations.

-{ lib }:
-with lib.trivial;
-let
-  inherit (lib.strings) toInt;
-in
+with import ./trivial.nix;
+
 rec {

  inherit (builtins) head tail length isList elemAt concatLists filter elem genList;

-  /*  Create a list consisting of a single element.  `singleton x` is
-      sometimes more convenient with respect to indentation than `[x]`
-      when x spans multiple lines.

-      Type: singleton :: a -> [a]
-
-      Example:
-        singleton "foo"
-        => [ "foo" ]
-  */
+  # Create a list consisting of a single element.  `singleton x' is
+  # sometimes more convenient with respect to indentation than `[x]'
+  # when x spans multiple lines.
  singleton = x: [x];

-  /* “right fold” a binary function `op` between successive elements of
-     `list` with `nul' as the starting value, i.e.,
-     `foldr op nul [x_1 x_2 ... x_n] == op x_1 (op x_2 ... (op x_n nul))`.

-     Type: foldr :: (a -> b -> b) -> b -> [a] -> b
-
-     Example:
-       concat = foldr (a: b: a + b) "z"
-       concat [ "a" "b" "c" ]
-       => "abcz"
-       # different types
-       strange = foldr (int: str: toString (int + 1) + str) "a"
-       strange [ 1 2 3 4 ]
-       => "2345a"
-  */
-  foldr = op: nul: list:
+  # "Fold" a binary function `op' between successive elements of
+  # `list' with `nul' as the starting value, i.e., `fold op nul [x_1
+  # x_2 ... x_n] == op x_1 (op x_2 ... (op x_n nul))'.  (This is
+  # Haskell's foldr).
+  fold = op: nul: list:
    let
      len = length list;
      fold' = n:
@@ -45,427 +26,156 @@ rec {
        else op (elemAt list n) (fold' (n + 1));
    in fold' 0;

-  /* `fold` is an alias of `foldr` for historic reasons */
-  # FIXME(Profpatsch): deprecate?
-  fold = foldr;
-
-
-  /* “left fold”, like `foldr`, but from the left:
-     `foldl op nul [x_1 x_2 ... x_n] == op (... (op (op nul x_1) x_2) ... x_n)`.
-
-     Type: foldl :: (b -> a -> b) -> b -> [a] -> b
-
-     Example:
-       lconcat = foldl (a: b: a + b) "z"
-       lconcat [ "a" "b" "c" ]
-       => "zabc"
-       # different types
-       lstrange = foldl (str: int: str + toString (int + 1)) ""
-       strange [ 1 2 3 4 ]
-       => "a2345"
-  */
+  # Left fold: `fold op nul [x_1 x_2 ... x_n] == op (... (op (op nul
+  # x_1) x_2) ... x_n)'.
  foldl = op: nul: list:
    let
+      len = length list;
      foldl' = n:
        if n == -1
        then nul
        else op (foldl' (n - 1)) (elemAt list n);
    in foldl' (length list - 1);

-  /* Strict version of `foldl`.

-     The difference is that evaluation is forced upon access. Usually used
-     with small whole results (in contract with lazily-generated list or large
-     lists where only a part is consumed.)
-
-     Type: foldl' :: (b -> a -> b) -> b -> [a] -> b
-  */
+  # Strict version of foldl.
  foldl' = builtins.foldl' or foldl;

-  /* Map with index starting from 0

-     Type: imap0 :: (int -> a -> b) -> [a] -> [b]
+  # Map with index: `imap (i: v: "${v}-${toString i}") ["a" "b"] ==
+  # ["a-1" "b-2"]'. FIXME: why does this start to count at 1?
+  imap =
+    if builtins ? genList then
+      f: list: genList (n: f (n + 1) (elemAt list n)) (length list)
+    else
+      f: list:
+      let
+        len = length list;
+        imap' = n:
+          if n == len
+            then []
+            else [ (f (n + 1) (elemAt list n)) ] ++ imap' (n + 1);
+      in imap' 0;

-     Example:
-       imap0 (i: v: "${v}-${toString i}") ["a" "b"]
-       => [ "a-0" "b-1" ]
-  */
-  imap0 = f: list: genList (n: f n (elemAt list n)) (length list);

-  /* Map with index starting from 1
+  # Map and concatenate the result.
+  concatMap = f: list: concatLists (map f list);

-     Type: imap1 :: (int -> a -> b) -> [a] -> [b]

-     Example:
-       imap1 (i: v: "${v}-${toString i}") ["a" "b"]
-       => [ "a-1" "b-2" ]
-  */
-  imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
-
-  /* Map and concatenate the result.
-
-     Type: concatMap :: (a -> [b]) -> [a] -> [b]
-
-     Example:
-       concatMap (x: [x] ++ ["z"]) ["a" "b"]
-       => [ "a" "z" "b" "z" ]
-  */
-  concatMap = builtins.concatMap or (f: list: concatLists (map f list));
-
-  /* Flatten the argument into a single list; that is, nested lists are
-     spliced into the top-level lists.
-
-     Example:
-       flatten [1 [2 [3] 4] 5]
-       => [1 2 3 4 5]
-       flatten 1
-       => [1]
-  */
+  # Flatten the argument into a single list; that is, nested lists are
+  # spliced into the top-level lists.  E.g., `flatten [1 [2 [3] 4] 5]
+  # == [1 2 3 4 5]' and `flatten 1 == [1]'.
  flatten = x:
    if isList x
-    then concatMap (y: flatten y) x
+    then foldl' (x: y: x ++ (flatten y)) [] x
    else [x];

-  /* Remove elements equal to 'e' from a list.  Useful for buildInputs.

-     Type: remove :: a -> [a] -> [a]
+  # Remove elements equal to 'e' from a list.  Useful for buildInputs.
+  remove = e: filter (x: x != e);

-     Example:
-       remove 3 [ 1 3 4 3 ]
-       => [ 1 4 ]
-  */
-  remove =
-    # Element to remove from the list
-    e: filter (x: x != e);

-  /* Find the sole element in the list matching the specified
-     predicate, returns `default` if no such element exists, or
-     `multiple` if there are multiple matching elements.
-
-     Type: findSingle :: (a -> bool) -> a -> a -> [a] -> a
-
-     Example:
-       findSingle (x: x == 3) "none" "multiple" [ 1 3 3 ]
-       => "multiple"
-       findSingle (x: x == 3) "none" "multiple" [ 1 3 ]
-       => 3
-       findSingle (x: x == 3) "none" "multiple" [ 1 9 ]
-       => "none"
-  */
-  findSingle =
-    # Predicate
-    pred:
-    # Default value to return if element was not found.
-    default:
-    # Default value to return if more than one element was found
-    multiple:
-    # Input list
-    list:
+  # Find the sole element in the list matching the specified
+  # predicate, returns `default' if no such element exists, or
+  # `multiple' if there are multiple matching elements.
+  findSingle = pred: default: multiple: list:
    let found = filter pred list; len = length found;
    in if len == 0 then default
      else if len != 1 then multiple
      else head found;

-  /* Find the first element in the list matching the specified
-     predicate or return `default` if no such element exists.

-     Type: findFirst :: (a -> bool) -> a -> [a] -> a
-
-     Example:
-       findFirst (x: x > 3) 7 [ 1 6 4 ]
-       => 6
-       findFirst (x: x > 9) 7 [ 1 6 4 ]
-       => 7
-  */
-  findFirst =
-    # Predicate
-    pred:
-    # Default value to return
-    default:
-    # Input list
-    list:
+  # Find the first element in the list matching the specified
+  # predicate or returns `default' if no such element exists.
+  findFirst = pred: default: list:
    let found = filter pred list;
    in if found == [] then default else head found;

-  /* Return true if function `pred` returns true for at least one
-     element of `list`.

-     Type: any :: (a -> bool) -> [a] -> bool
+  # Return true iff function `pred' returns true for at least element
+  # of `list'.
+  any = builtins.any or (pred: fold (x: y: if pred x then true else y) false);

-     Example:
-       any isString [ 1 "a" { } ]
-       => true
-       any isString [ 1 { } ]
-       => false
-  */
-  any = builtins.any or (pred: foldr (x: y: if pred x then true else y) false);

-  /* Return true if function `pred` returns true for all elements of
-     `list`.
+  # Return true iff function `pred' returns true for all elements of
+  # `list'.
+  all = builtins.all or (pred: fold (x: y: if pred x then y else false) true);

-     Type: all :: (a -> bool) -> [a] -> bool

-     Example:
-       all (x: x < 3) [ 1 2 ]
-       => true
-       all (x: x < 3) [ 1 2 3 ]
-       => false
-  */
-  all = builtins.all or (pred: foldr (x: y: if pred x then y else false) true);
+  # Count how many times function `pred' returns true for the elements
+  # of `list'.
+  count = pred: foldl' (c: x: if pred x then c + 1 else c) 0;

-  /* Count how many elements of `list` match the supplied predicate
-     function.

-     Type: count :: (a -> bool) -> [a] -> int
-
-     Example:
-       count (x: x == 3) [ 3 2 3 4 6 ]
-       => 2
-  */
-  count =
-    # Predicate
-    pred: foldl' (c: x: if pred x then c + 1 else c) 0;
-
-  /* Return a singleton list or an empty list, depending on a boolean
-     value.  Useful when building lists with optional elements
-     (e.g. `++ optional (system == "i686-linux") flashplayer').
-
-     Type: optional :: bool -> a -> [a]
-
-     Example:
-       optional true "foo"
-       => [ "foo" ]
-       optional false "foo"
-       => [ ]
-  */
+  # Return a singleton list or an empty list, depending on a boolean
+  # value.  Useful when building lists with optional elements
+  # (e.g. `++ optional (system == "i686-linux") flashplayer').
  optional = cond: elem: if cond then [elem] else [];

-  /* Return a list or an empty list, depending on a boolean value.

-     Type: optionals :: bool -> [a] -> [a]
-
-     Example:
-       optionals true [ 2 3 ]
-       => [ 2 3 ]
-       optionals false [ 2 3 ]
-       => [ ]
-  */
-  optionals =
-    # Condition
-    cond:
-    # List to return if condition is true
-    elems: if cond then elems else [];
+  # Return a list or an empty list, dependening on a boolean value.
+  optionals = cond: elems: if cond then elems else [];


-  /* If argument is a list, return it; else, wrap it in a singleton
-     list.  If you're using this, you should almost certainly
-     reconsider if there isn't a more "well-typed" approach.
-
-     Example:
-       toList [ 1 2 ]
-       => [ 1 2 ]
-       toList "hi"
-       => [ "hi "]
-  */
+  # If argument is a list, return it; else, wrap it in a singleton
+  # list.  If you're using this, you should almost certainly
+  # reconsider if there isn't a more "well-typed" approach.
  toList = x: if isList x then x else [x];

-  /* Return a list of integers from `first' up to and including `last'.

-     Type: range :: int -> int -> [int]
-
-     Example:
-       range 2 4
-       => [ 2 3 4 ]
-       range 3 2
-       => [ ]
-  */
+  # Return a list of integers from `first' up to and including `last'.
  range =
-    # First integer in the range
-    first:
-    # Last integer in the range
-    last:
-    if first > last then
-      []
+    if builtins ? genList then
+      first: last:
+        if first > last
+        then []
+        else genList (n: first + n) (last - first + 1)
    else
-      genList (n: first + n) (last - first + 1);
+      first: last:
+        if last < first
+        then []
+        else [first] ++ range (first + 1) last;

-  /* Splits the elements of a list in two lists, `right` and
-     `wrong`, depending on the evaluation of a predicate.

-     Type: (a -> bool) -> [a] -> { right :: [a], wrong :: [a] }
-
-     Example:
-       partition (x: x > 2) [ 5 1 2 3 4 ]
-       => { right = [ 5 3 4 ]; wrong = [ 1 2 ]; }
-  */
-  partition = builtins.partition or (pred:
-    foldr (h: t:
+  # Partition the elements of a list in two lists, `right' and
+  # `wrong', depending on the evaluation of a predicate.
+  partition = pred:
+    fold (h: t:
      if pred h
      then { right = [h] ++ t.right; wrong = t.wrong; }
      else { right = t.right; wrong = [h] ++ t.wrong; }
-    ) { right = []; wrong = []; });
+    ) { right = []; wrong = []; };

-  /* Splits the elements of a list into many lists, using the return value of a predicate.
-     Predicate should return a string which becomes keys of attrset `groupBy' returns.

-     `groupBy'` allows to customise the combining function and initial value
-
-     Example:
-       groupBy (x: boolToString (x > 2)) [ 5 1 2 3 4 ]
-       => { true = [ 5 3 4 ]; false = [ 1 2 ]; }
-       groupBy (x: x.name) [ {name = "icewm"; script = "icewm &";}
-                             {name = "xfce";  script = "xfce4-session &";}
-                             {name = "icewm"; script = "icewmbg &";}
-                             {name = "mate";  script = "gnome-session &";}
-                           ]
-       => { icewm = [ { name = "icewm"; script = "icewm &"; }
-                      { name = "icewm"; script = "icewmbg &"; } ];
-            mate  = [ { name = "mate";  script = "gnome-session &"; } ];
-            xfce  = [ { name = "xfce";  script = "xfce4-session &"; } ];
-          }
-
-       groupBy' builtins.add 0 (x: boolToString (x > 2)) [ 5 1 2 3 4 ]
-       => { true = 12; false = 3; }
-  */
-  groupBy' = op: nul: pred: lst:
-    foldl' (r: e:
-              let
-                key = pred e;
-              in
-                r // { ${key} = op (r.${key} or nul) e; }
-           ) {} lst;
-
-  groupBy = groupBy' (sum: e: sum ++ [e]) [];
-
-  /* Merges two lists of the same size together. If the sizes aren't the same
-     the merging stops at the shortest. How both lists are merged is defined
-     by the first argument.
-
-     Type: zipListsWith :: (a -> b -> c) -> [a] -> [b] -> [c]
-
-     Example:
-       zipListsWith (a: b: a + b) ["h" "l"] ["e" "o"]
-       => ["he" "lo"]
-  */
  zipListsWith =
-    # Function to zip elements of both lists
-    f:
-    # First list
-    fst:
-    # Second list
-    snd:
-    genList
-      (n: f (elemAt fst n) (elemAt snd n)) (min (length fst) (length snd));
+    if builtins ? genList then
+      f: fst: snd: genList (n: f (elemAt fst n) (elemAt snd n)) (min (length fst) (length snd))
+    else
+      f: fst: snd:
+      let
+        len = min (length fst) (length snd);
+        zipListsWith' = n:
+          if n != len then
+            [ (f (elemAt fst n) (elemAt snd n)) ]
+            ++ zipListsWith' (n + 1)
+          else [];
+      in zipListsWith' 0;

-  /* Merges two lists of the same size together. If the sizes aren't the same
-     the merging stops at the shortest.
-
-     Type: zipLists :: [a] -> [b] -> [{ fst :: a, snd :: b}]
-
-     Example:
-       zipLists [ 1 2 ] [ "a" "b" ]
-       => [ { fst = 1; snd = "a"; } { fst = 2; snd = "b"; } ]
-  */
  zipLists = zipListsWith (fst: snd: { inherit fst snd; });

-  /* Reverse the order of the elements of a list.

-     Type: reverseList :: [a] -> [a]
+  # Reverse the order of the elements of a list.
+  reverseList =
+    if builtins ? genList then
+      xs: let l = length xs; in genList (n: elemAt xs (l - n - 1)) l
+    else
+      fold (e: acc: acc ++ [ e ]) [];

-     Example:

-       reverseList [ "b" "o" "j" ]
-       => [ "j" "o" "b" ]
-  */
-  reverseList = xs:
-    let l = length xs; in genList (n: elemAt xs (l - n - 1)) l;
-
-  /* Depth-First Search (DFS) for lists `list != []`.
-
-     `before a b == true` means that `b` depends on `a` (there's an
-     edge from `b` to `a`).
-
-     Example:
-         listDfs true hasPrefix [ "/home/user" "other" "/" "/home" ]
-           == { minimal = "/";                  # minimal element
-                visited = [ "/home/user" ];     # seen elements (in reverse order)
-                rest    = [ "/home" "other" ];  # everything else
-              }
-
-         listDfs true hasPrefix [ "/home/user" "other" "/" "/home" "/" ]
-           == { cycle   = "/";                  # cycle encountered at this element
-                loops   = [ "/" ];              # and continues to these elements
-                visited = [ "/" "/home/user" ]; # elements leading to the cycle (in reverse order)
-                rest    = [ "/home" "other" ];  # everything else
-
-   */
-  listDfs = stopOnCycles: before: list:
-    let
-      dfs' = us: visited: rest:
-        let
-          c = filter (x: before x us) visited;
-          b = partition (x: before x us) rest;
-        in if stopOnCycles && (length c > 0)
-           then { cycle = us; loops = c; inherit visited rest; }
-           else if length b.right == 0
-                then # nothing is before us
-                     { minimal = us; inherit visited rest; }
-                else # grab the first one before us and continue
-                     dfs' (head b.right)
-                          ([ us ] ++ visited)
-                          (tail b.right ++ b.wrong);
-    in dfs' (head list) [] (tail list);
-
-  /* Sort a list based on a partial ordering using DFS. This
-     implementation is O(N^2), if your ordering is linear, use `sort`
-     instead.
-
-     `before a b == true` means that `b` should be after `a`
-     in the result.
-
-     Example:
-
-         toposort hasPrefix [ "/home/user" "other" "/" "/home" ]
-           == { result = [ "/" "/home" "/home/user" "other" ]; }
-
-         toposort hasPrefix [ "/home/user" "other" "/" "/home" "/" ]
-           == { cycle = [ "/home/user" "/" "/" ]; # path leading to a cycle
-                loops = [ "/" ]; }                # loops back to these elements
-
-         toposort hasPrefix [ "other" "/home/user" "/home" "/" ]
-           == { result = [ "other" "/" "/home" "/home/user" ]; }
-
-         toposort (a: b: a < b) [ 3 2 1 ] == { result = [ 1 2 3 ]; }
-
-   */
-  toposort = before: list:
-    let
-      dfsthis = listDfs true before list;
-      toporest = toposort before (dfsthis.visited ++ dfsthis.rest);
-    in
-      if length list < 2
-      then # finish
-           { result =  list; }
-      else if dfsthis ? "cycle"
-           then # there's a cycle, starting from the current vertex, return it
-                { cycle = reverseList ([ dfsthis.cycle ] ++ dfsthis.visited);
-                  inherit (dfsthis) loops; }
-           else if toporest ? "cycle"
-                then # there's a cycle somewhere else in the graph, return it
-                     toporest
-                # Slow, but short. Can be made a bit faster with an explicit stack.
-                else # there are no cycles
-                     { result = [ dfsthis.minimal ] ++ toporest.result; };
-
-  /* Sort a list based on a comparator function which compares two
-     elements and returns true if the first argument is strictly below
-     the second argument.  The returned list is sorted in an increasing
-     order.  The implementation does a quick-sort.
-
-     Example:
-       sort (a: b: a < b) [ 5 3 7 ]
-       => [ 3 5 7 ]
-  */
+  # Sort a list based on a comparator function which compares two
+  # elements and returns true if the first argument is strictly below
+  # the second argument.  The returned list is sorted in an increasing
+  # order.  The implementation does a quick-sort.
  sort = builtins.sort or (
    strictLess: list:
    let
@@ -483,97 +193,42 @@ rec {
      if len < 2 then list
      else (sort strictLess pivot.left) ++  [ first ] ++  (sort strictLess pivot.right));

-  /* Compare two lists element-by-element.

-     Example:
-       compareLists compare [] []
-       => 0
-       compareLists compare [] [ "a" ]
-       => -1
-       compareLists compare [ "a" ] []
-       => 1
-       compareLists compare [ "a" "b" ] [ "a" "c" ]
-       => 1
-  */
-  compareLists = cmp: a: b:
-    if a == []
-    then if b == []
-         then 0
-         else -1
-    else if b == []
-         then 1
-         else let rel = cmp (head a) (head b); in
-              if rel == 0
-              then compareLists cmp (tail a) (tail b)
-              else rel;
-
-  /* Sort list using "Natural sorting".
-     Numeric portions of strings are sorted in numeric order.
-
-     Example:
-       naturalSort ["disk11" "disk8" "disk100" "disk9"]
-       => ["disk8" "disk9" "disk11" "disk100"]
-       naturalSort ["10.46.133.149" "10.5.16.62" "10.54.16.25"]
-       => ["10.5.16.62" "10.46.133.149" "10.54.16.25"]
-       naturalSort ["v0.2" "v0.15" "v0.0.9"]
-       => [ "v0.0.9" "v0.2" "v0.15" ]
-  */
-  naturalSort = lst:
-    let
-      vectorise = s: map (x: if isList x then toInt (head x) else x) (builtins.split "(0|[1-9][0-9]*)" s);
-      prepared = map (x: [ (vectorise x) x ]) lst; # remember vectorised version for O(n) regex splits
-      less = a: b: (compareLists compare (head a) (head b)) < 0;
-    in
-      map (x: elemAt x 1) (sort less prepared);
-
-  /* Return the first (at most) N elements of a list.
-
-     Type: take :: int -> [a] -> [a]
-
-     Example:
-       take 2 [ "a" "b" "c" "d" ]
-       => [ "a" "b" ]
-       take 2 [ ]
-       => [ ]
-  */
+  # Return the first (at most) N elements of a list.
  take =
-    # Number of elements to take
-    count: sublist 0 count;
+    if builtins ? genList then
+      count: sublist 0 count
+    else
+      count: list:
+        let
+          len = length list;
+          take' = n:
+            if n == len || n == count
+              then []
+            else
+              [ (elemAt list n) ] ++ take' (n + 1);
+        in take' 0;

-  /* Remove the first (at most) N elements of a list.

-     Type: drop :: int -> [a] -> [a]
-
-     Example:
-       drop 2 [ "a" "b" "c" "d" ]
-       => [ "c" "d" ]
-       drop 2 [ ]
-       => [ ]
-  */
+  # Remove the first (at most) N elements of a list.
  drop =
-    # Number of elements to drop
-    count:
-    # Input list
-    list: sublist count (length list) list;
+    if builtins ? genList then
+      count: list: sublist count (length list) list
+    else
+      count: list:
+        let
+          len = length list;
+          drop' = n:
+            if n == -1 || n < count
+              then []
+            else
+              drop' (n - 1) ++ [ (elemAt list n) ];
+        in drop' (len - 1);

-  /* Return a list consisting of at most `count` elements of `list`,
-     starting at index `start`.

-     Type: sublist :: int -> int -> [a] -> [a]
-
-     Example:
-       sublist 1 3 [ "a" "b" "c" "d" "e" ]
-       => [ "b" "c" "d" ]
-       sublist 1 3 [ ]
-       => [ ]
-  */
-  sublist =
-    # Index at which to start the sublist
-    start:
-    # Number of elements to take
-    count:
-    # Input list
-    list:
+  # Return a list consisting of at most ‘count’ elements of ‘list’,
+  # starting at index ‘start’.
+  sublist = start: count: list:
    let len = length list; in
    genList
      (n: elemAt list (n + start))
@@ -581,49 +236,23 @@ rec {
       else if start + count > len then len - start
       else count);

-  /* Return the last element of a list.

-     This function throws an error if the list is empty.
-
-     Type: last :: [a] -> a
-
-     Example:
-       last [ 1 2 3 ]
-       => 3
-  */
+  # Return the last element of a list.
  last = list:
    assert list != []; elemAt list (length list - 1);

-  /* Return all elements but the last.

-     This function throws an error if the list is empty.
-
-     Type: init :: [a] -> [a]
-
-     Example:
-       init [ 1 2 3 ]
-       => [ 1 2 ]
-  */
+  # Return all elements but the last
  init = list: assert list != []; take (length list - 1) list;


-  /* Return the image of the cross product of some lists by a function.
+  deepSeqList = xs: y: if any (x: deepSeq x false) xs then y else y;
+

-    Example:
-      crossLists (x:y: "${toString x}${toString y}") [[1 2] [3 4]]
-      => [ "13" "14" "23" "24" ]
-  */
  crossLists = f: foldl (fs: args: concatMap (f: map f args) fs) [f];


-  /* Remove duplicate elements from the list. O(n^2) complexity.
-
-     Type: unique :: [a] -> [a]
-
-     Example:
-       unique [ 3 2 3 4 ]
-       => [ 3 2 4 ]
-   */
+  # Remove duplicate elements from the list. O(n^2) complexity.
  unique = list:
    if list == [] then
      []
@@ -633,28 +262,12 @@ rec {
        xs = unique (drop 1 list);
      in [x] ++ remove x xs;

-  /* Intersects list 'e' and another list. O(nm) complexity.

-     Example:
-       intersectLists [ 1 2 3 ] [ 6 3 2 ]
-       => [ 3 2 ]
-  */
+  # Intersects list 'e' and another list. O(nm) complexity.
  intersectLists = e: filter (x: elem x e);

-  /* Subtracts list 'e' from another list. O(nm) complexity.

-     Example:
-       subtractLists [ 3 2 ] [ 1 2 3 4 5 3 ]
-       => [ 1 4 5 ]
-  */
+  # Subtracts list 'e' from another list. O(nm) complexity.
  subtractLists = e: filter (x: !(elem x e));

-  /* Test if two lists have no common element.
-     It should be slightly more efficient than (intersectLists a b == [])
-  */
-  mutuallyExclusive = a: b:
-    (builtins.length a) == 0 ||
-    (!(builtins.elem (builtins.head a) b) &&
-     mutuallyExclusive (builtins.tail a) b);
-
 }
--- a/lib/maintainers.nix
+++ b/lib/maintainers.nix
@@ -0,0 +1,367 @@
+/* List of NixOS maintainers. The format is:
+
+    handle = "Real Name <address@example.org>";
+
+  where <handle> is preferred to be your GitHub username (so it's easy
+  to ping a package @<handle>), and <Real Name> is your real name, not
+  a pseudonym. Please keep the list alphabetically sorted. */
+{
+  a1russell = "Adam Russell <adamlr6+pub@gmail.com>";
+  aaronschif = "Aaron Schif <aaronschif@gmail.com>";
+  abaldeau = "Andreas Baldeau <andreas@baldeau.net>";
+  abbradar = "Nikolay Amiantov <ab@fmap.me>";
+  adev = "Adrien Devresse <adev@adev.name>";
+  aespinosa = "Allan Espinosa <allan.espinosa@outlook.com>";
+  aflatter = "Alexander Flatter <flatter@fastmail.fm>";
+  aforemny = "Alexander Foremny <alexanderforemny@googlemail.com>";
+  aherrmann = "Andreas Herrmann <andreash87@gmx.ch>";
+  ak = "Alexander Kjeldaas <ak@formalprivacy.com>";
+  akaWolf = "Artjom Vejsel <akawolf0@gmail.com>";
+  akc = "Anders Claesson <akc@akc.is>";
+  algorith = "Dries Van Daele <dries_van_daele@telenet.be>";
+  all = "Nix Committers <nix-commits@lists.science.uu.nl>";
+  ambrop72 = "Ambroz Bizjak <ambrop7@gmail.com>";
+  amiddelk = "Arie Middelkoop <amiddelk@gmail.com>";
+  amorsillo = "Andrew Morsillo <andrew.morsillo@gmail.com>";
+  AndersonTorres = "Anderson Torres <torres.anderson.85@gmail.com>";
+  anderspapitto = "Anders Papitto <anderspapitto@gmail.com>";
+  andres = "Andres Loeh <ksnixos@andres-loeh.de>";
+  andrewrk = "Andrew Kelley <superjoe30@gmail.com>";
+  aneeshusa = "Aneesh Agrawal <aneeshusa@gmail.com>";
+  antono = "Antono Vasiljev <self@antono.info>";
+  ardumont = "Antoine R. Dumont <eniotna.t@gmail.com>";
+  aristid = "Aristid Breitkreuz <aristidb@gmail.com>";
+  arobyn = "Alexei Robyn <shados@shados.net>";
+  asppsa = "Alastair Pharo <asppsa@gmail.com>";
+  astsmtl = "Alexander Tsamutali <astsmtl@yandex.ru>";
+  aszlig = "aszlig <aszlig@redmoonstudios.org>";
+  auntie = "Jonathan Glines <auntieNeo@gmail.com>";
+  avnik = "Alexander V. Nikolaev <avn@avnik.info>";
+  aycanirican = "Aycan iRiCAN <iricanaycan@gmail.com>";
+  badi = "Badi' Abdul-Wahid <abdulwahidc@gmail.com>";
+  balajisivaraman = "Balaji Sivaraman<sivaraman.balaji@gmail.com>";
+  Baughn = "Svein Ove Aas <sveina@gmail.com>";
+  bbenoist = "Baptist BENOIST <return_0@live.com>";
+  bcarrell = "Brandon Carrell <brandoncarrell@gmail.com>";
+  bcdarwin = "Ben Darwin <bcdarwin@gmail.com>";
+  bdimcheff = "Brandon Dimcheff <brandon@dimcheff.com>";
+  benley = "Benjamin Staffin <benley@gmail.com>";
+  bennofs = "Benno Fünfstück <benno.fuenfstueck@gmail.com>";
+  berdario = "Dario Bertini <berdario@gmail.com>";
+  bergey = "Daniel Bergey <bergey@teallabs.org>";
+  bjg = "Brian Gough <bjg@gnu.org>";
+  bjornfor = "Bjørn Forsman <bjorn.forsman@gmail.com>";
+  bluescreen303 = "Mathijs Kwik <mathijs@bluescreen303.nl>";
+  bobvanderlinden = "Bob van der Linden <bobvanderlinden@gmail.com>";
+  bodil = "Bodil Stokke <nix@bodil.org>";
+  boothead = "Ben Ford <ben@perurbis.com>";
+  bosu = "Boris Sukholitko <boriss@gmail.com>";
+  bramd = "Bram Duvigneau <bram@bramd.nl>";
+  bstrik = "Berno Strik <dutchman55@gmx.com>";
+  bzizou = "Bruno Bzeznik <Bruno@bzizou.net>";
+  c0dehero = "CodeHero <codehero@nerdpol.ch>";
+  calrama = "Moritz Maxeiner <moritz@ucworks.org>";
+  campadrenalin = "Philip Horger <campadrenalin@gmail.com>";
+  cdepillabout = "Dennis Gosnell <cdep.illabout@gmail.com>";
+  cfouche = "Chaddaï Fouché <chaddai.fouche@gmail.com>";
+  chaoflow = "Florian Friesdorf <flo@chaoflow.net>";
+  chattered = "Phil Scott <me@philscotted.com>";
+  christopherpoole = "Christopher Mark Poole <mail@christopherpoole.net>";
+  cleverca22 = "Michael Bishop <cleverca22@gmail.com>";
+  coconnor = "Corey O'Connor <coreyoconnor@gmail.com>";
+  codsl = "codsl <codsl@riseup.net>";
+  codyopel = "Cody Opel <codyopel@gmail.com>";
+  colemickens = "Cole Mickens <cole.mickens@gmail.com>";
+  copumpkin = "Dan Peebles <pumpkingod@gmail.com>";
+  coroa = "Jonas Hörsch <jonas@chaoflow.net>";
+  couchemar = "Andrey Pavlov <couchemar@yandex.ru>";
+  cstrahan = "Charles Strahan <charles.c.strahan@gmail.com>";
+  cwoac = "Oliver Matthews <oliver@codersoffortune.net>";
+  DamienCassou = "Damien Cassou <damien@cassou.me>";
+  dasuxullebt = "Christoph-Simon Senjak <christoph.senjak@googlemail.com>";
+  davidak = "David Kleuker <post@davidak.de>";
+  davidrusu = "David Rusu <davidrusu.me@gmail.com>";
+  dbohdan = "Danyil Bohdan <danyil.bohdan@gmail.com>";
+  deepfire = "Kosyrev Serge <_deepfire@feelingofgreen.ru>";
+  demin-dmitriy = "Dmitriy Demin <demindf@gmail.com>";
+  DerGuteMoritz = "Moritz Heidkamp <moritz@twoticketsplease.de>";
+  desiderius = "Didier J. Devroye <didier@devroye.name>";
+  devhell = "devhell <\"^\"@regexmail.net>";
+  dezgeg = "Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>";
+  dfoxfranke = "Daniel Fox Franke <dfoxfranke@gmail.com>";
+  dgonyeo = "Derek Gonyeo <derek@gonyeo.com>";
+  dmalikov = "Dmitry Malikov <malikov.d.y@gmail.com>";
+  dochang = "Desmond O. Chang <dochang@gmail.com>";
+  doublec = "Chris Double <chris.double@double.co.nz>";
+  ebzzry = "Rommel Martinez <ebzzry@gmail.com>";
+  ederoyd46 = "Matthew Brown <matt@ederoyd.co.uk>";
+  eduarrrd = "Eduard Bachmakov <e.bachmakov@gmail.com>";
+  edwtjo = "Edward Tjörnhammar <ed@cflags.cc>";
+  eelco = "Eelco Dolstra <eelco.dolstra@logicblox.com>";
+  ehegnes = "Eric Hegnes <eric.hegnes@gmail.com>";
+  ehmry = "Emery Hemingway <emery@vfemail.net>";
+  eikek = "Eike Kettner <eike.kettner@posteo.de>";
+  elasticdog = "Aaron Bull Schaefer <aaron@elasticdog.com>";
+  elitak = "Eric Litak <elitak@gmail.com>";
+  ellis = "Ellis Whitehead <nixos@ellisw.net>";
+  epitrochoid = "Mabry Cervin <mpcervin@uncg.edu>";
+  ericbmerritt = "Eric Merritt <eric@afiniate.com>";
+  ericsagnes = "Eric Sagnes <eric.sagnes@gmail.com>";
+  erikryb = "Erik Rybakken <erik.rybakken@math.ntnu.no>";
+  ertes = "Ertugrul Söylemez <ertesx@gmx.de>";
+  exi = "Reno Reckling <nixos@reckling.org>";
+  exlevan = "Alexey Levan <exlevan@gmail.com>";
+  fadenb = "Tristan Helmich <tristan.helmich+nixos@gmail.com>";
+  falsifian = "James Cook <james.cook@utoronto.ca>";
+  flosse = "Markus Kohlhase <mail@markus-kohlhase.de>";
+  fluffynukeit = "Daniel Austin <dan@fluffynukeit.com>";
+  forkk = "Andrew Okin <forkk@forkk.net>";
+  fornever = "Friedrich von Never <friedrich@fornever.me>";
+  fpletz = "Franz Pletz <fpletz@fnordicwalking.de>";
+  fps = "Florian Paul Schmidt <mista.tapas@gmx.net>";
+  fridh = "Frederik Rietdijk <fridh@fridh.nl>";
+  fro_ozen = "fro_ozen <fro_ozen@gmx.de>";
+  ftrvxmtrx = "Siarhei Zirukin <ftrvxmtrx@gmail.com>";
+  funfunctor = "Edward O'Callaghan <eocallaghan@alterapraxis.com>";
+  fuuzetsu = "Mateusz Kowalczyk <fuuzetsu@fuuzetsu.co.uk>";
+  fxfactorial = "Edgar Aroutiounian <edgar.factorial@gmail.com>";
+  gal_bolle = "Florent Becker <florent.becker@ens-lyon.org>";
+  garbas = "Rok Garbas <rok@garbas.si>";
+  garrison = "Jim Garrison <jim@garrison.cc>";
+  gavin = "Gavin Rogers <gavin@praxeology.co.uk>";
+  gebner = "Gabriel Ebner <gebner@gebner.org>";
+  gfxmonk = "Tim Cuthbertson <tim@gfxmonk.net>";
+  giogadi = "Luis G. Torres <lgtorres42@gmail.com>";
+  gleber = "Gleb Peregud <gleber.p@gmail.com>";
+  globin = "Robin Gloster <mail@glob.in>";
+  goibhniu = "Cillian de Róiste <cillian.deroiste@gmail.com>";
+  Gonzih = "Max Gonzih <gonzih@gmail.com>";
+  gridaphobe = "Eric Seidel <eric@seidel.io>";
+  guibert = "David Guibert <david.guibert@gmail.com>";
+  havvy = "Ryan Scheel <ryan.havvy@gmail.com>";
+  hbunke = "Hendrik Bunke <bunke.hendrik@gmail.com>";
+  henrytill = "Henry Till <henrytill@gmail.com>";
+  hiberno = "Christian Lask <mail@elfsechsundzwanzig.de>";
+  hinton = "Tom Hinton <t@larkery.com>";
+  hrdinka = "Christoph Hrdinka <c.nix@hrdinka.at>";
+  iand675 = "Ian Duncan <ian@iankduncan.com>";
+  ianwookim = "Ian-Woo Kim <ianwookim@gmail.com>";
+  iElectric = "Domen Kozar <domen@dev.si>";
+  igsha = "Igor Sharonov <igor.sharonov@gmail.com>";
+  ikervagyok = "Balázs Lengyel <ikervagyok@gmail.com>";
+  j-keck = "Jürgen Keck <jhyphenkeck@gmail.com>";
+  jagajaga = "Arseniy Seroka <ars.seroka@gmail.com>";
+  javaguirre = "Javier Aguirre <contacto@javaguirre.net>";
+  jb55 = "William Casarin <bill@casarin.me>";
+  jcumming = "Jack Cummings <jack@mudshark.org>";
+  jefdaj = "Jeffrey David Johnson <jefdaj@gmail.com>";
+  jfb = "James Felix Black <james@yamtime.com>";
+  jgeerds = "Jascha Geerds <jascha@jgeerds.name>";
+  jgillich = "Jakob Gillich <jakob@gillich.me>";
+  jirkamarsik = "Jirka Marsik <jiri.marsik89@gmail.com>";
+  joachifm = "Joachim Fasting <joachifm@fastmail.fm>";
+  joamaki = "Jussi Maki <joamaki@gmail.com>";
+  joelmo = "Joel Moberg <joel.moberg@gmail.com>";
+  joelteon = "Joel Taylor <me@joelt.io>";
+  jpbernardy = "Jean-Philippe Bernardy <jeanphilippe.bernardy@gmail.com>";
+  jwiegley = "John Wiegley <johnw@newartisans.com>";
+  jwilberding = "Jordan Wilberding <jwilberding@afiniate.com>";
+  jzellner = "Jeff Zellner <jeffz@eml.cc>";
+  kamilchm = "Kamil Chmielewski <kamil.chm@gmail.com>";
+  kampfschlaefer = "Arnold Krille <arnold@arnoldarts.de>";
+  kevincox = "Kevin Cox <kevincox@kevincox.ca>";
+  khumba = "Bryan Gardiner <bog@khumba.net>";
+  kkallio = "Karn Kallio <tierpluspluslists@gmail.com>";
+  koral = "Koral <koral@mailoo.org>";
+  kovirobi = "Kovacsics Robert <kovirobi@gmail.com>";
+  kragniz = "Louis Taylor <louis@kragniz.eu>";
+  ktosiek = "Tomasz Kontusz <tomasz.kontusz@gmail.com>";
+  lassulus = "Lassulus <lassulus@gmail.com>";
+  layus = "Guillaume Maudoux <layus.on@gmail.com>";
+  lebastr = "Alexander Lebedev <lebastr@gmail.com>";
+  leenaars = "Michiel Leenaars <ml.software@leenaa.rs>";
+  leonardoce = "Leonardo Cecchi <leonardo.cecchi@gmail.com>";
+  lethalman = "Luca Bruno <lucabru@src.gnome.org>";
+  lewo = "Antoine Eiche <lewo@abesis.fr>";
+  lhvwb = "Nathaniel Baxter <nathaniel.baxter@gmail.com>";
+  lihop = "Leroy Hopson <nixos@leroy.geek.nz>";
+  linquize = "Linquize <linquize@yahoo.com.hk>";
+  linus = "Linus Arver <linusarver@gmail.com>";
+  lnl7 = "Daiderd Jordan <daiderd@gmail.com>";
+  lovek323 = "Jason O'Conal <jason@oconal.id.au>";
+  lowfatcomputing = "Andreas Wagner <andreas.wagner@lowfatcomputing.org>";
+  lsix = "Lancelot SIX <lsix@lancelotsix.com>";
+  ludo = "Ludovic Courtès <ludo@gnu.org>";
+  luispedro = "Luis Pedro Coelho <luis@luispedro.org>";
+  lukasepple = "Lukas Epple <post@lukasepple.de>";
+  lukego = "Luke Gorrie <luke@snabb.co>";
+  lw = "Sergey Sofeychuk <lw@fmap.me>";
+  madjar = "Georges Dubus <georges.dubus@compiletoi.net>";
+  magnetophon = "Bart Brouns <bart@magnetophon.nl>";
+  mahe = "Matthias Herrmann <matthias.mh.herrmann@gmail.com>";
+  makefu = "Felix Richter <makefu@syntax-fehler.de>";
+  malyn = "Michael Alyn Miller <malyn@strangeGizmo.com>";
+  manveru = "Michael Fellinger <m.fellinger@gmail.com>";
+  marcweber = "Marc Weber <marco-oweber@gmx.de>";
+  markWot = "Markus Wotringer <markus@wotringer.de>";
+  matejc = "Matej Cotman <cotman.matej@gmail.com>";
+  mathnerd314 = "Mathnerd314 <mathnerd314.gph+hs@gmail.com>";
+  matthiasbeyer = "Matthias Beyer <mail@beyermatthias.de>";
+  maurer = "Matthew Maurer <matthew.r.maurer+nix@gmail.com>";
+  mbakke = "Marius Bakke <ymse@tuta.io>";
+  mbe = "Brandon Edens <brandonedens@gmail.com>";
+  mcmtroffaes = "Matthias C. M. Troffaes <matthias.troffaes@gmail.com>";
+  meditans = "Carlo Nucera <meditans@gmail.com>";
+  meisternu = "Matt Miemiec <meister@krutt.org>";
+  michaelpj = "Michael Peyton Jones <michaelpj@gmail.com>";
+  michelk = "Michel Kuhlmann <michel@kuhlmanns.info>";
+  mingchuan = "Ming Chuan <ming@culpring.com>";
+  mirdhyn = "Merlin Gaillard <mirdhyn@gmail.com>";
+  modulistic = "Pablo Costa <modulistic@gmail.com>";
+  mog = "Matthew O'Gorman <mog-lists@rldn.net>";
+  mornfall = "Petr Ročkai <me@mornfall.net>";
+  MP2E = "Cray Elliott <MP2E@archlinux.us>";
+  msackman = "Matthew Sackman <matthew@wellquite.org>";
+  mschristiansen = "Mikkel Christiansen <mikkel@rheosystems.com>";
+  msteen = "Matthijs Steen <emailmatthijs@gmail.com>";
+  mtreskin = "Max Treskin <zerthurd@gmail.com>";
+  mudri = "James Wood <lamudri@gmail.com>";
+  muflax = "Stefan Dorn <mail@muflax.com>";
+  nathan-gs = "Nathan Bijnens <nathan@nathan.gs>";
+  nckx = "Tobias Geerinckx-Rice <tobias.geerinckx.rice@gmail.com>";
+  nequissimus = "Tim Steinbach <tim@nequissimus.com>";
+  nfjinjing = "Jinjing Wang <nfjinjing@gmail.com>";
+  nico202 = "Nicolò Balzarotti <anothersms@gmail.com>";
+  notthemessiah = "Brian Cohen <brian.cohen.88@gmail.com>";
+  np = "Nicolas Pouillard <np.nix@nicolaspouillard.fr>";
+  nslqqq = "Nikita Mikhailov <nslqqq@gmail.com>";
+  obadz = "obadz <dav-nixos@odav.org>";
+  ocharles = "Oliver Charles <ollie@ocharles.org.uk>";
+  odi = "Oliver Dunkl <oliver.dunkl@gmail.com>";
+  offline = "Jaka Hudoklin <jakahudoklin@gmail.com>";
+  olcai = "Erik Timan <dev@timan.info>";
+  orbitz = "Malcolm Matalka <mmatalka@gmail.com>";
+  osener = "Ozan Sener <ozan@ozansener.com>";
+  oxij = "Jan Malakhovski <oxij@oxij.org>";
+  page = "Carles Pagès <page@cubata.homelinux.net>";
+  paholg = "Paho Lurie-Gregg <paho@paholg.com>";
+  pakhfn = "Fedor Pakhomov <pakhfn@gmail.com>";
+  palo = "Ingolf Wanger <palipalo9@googlemail.com>";
+  pashev = "Igor Pashev <pashev.igor@gmail.com>";
+  pesterhazy = "Paulus Esterhazy <pesterhazy@gmail.com>";
+  philandstuff = "Philip Potter <philip.g.potter@gmail.com>";
+  phile314 = "Philipp Hausmann <nix@314.ch>";
+  Phlogistique = "Noé Rubinstein <noe.rubinstein@gmail.com>";
+  phreedom = "Evgeny Egorochkin <phreedom@yandex.ru>";
+  phunehehe = "Hoang Xuan Phu <phunehehe@gmail.com>";
+  pierron = "Nicolas B. Pierron <nixos@nbp.name>";
+  piotr = "Piotr Pietraszkiewicz <ppietrasa@gmail.com>";
+  pjbarnoy = "Perry Barnoy <pjbarnoy@gmail.com>";
+  pjones = "Peter Jones <pjones@devalot.com>";
+  pkmx = "Chih-Mao Chen <pkmx.tw@gmail.com>";
+  plcplc = "Philip Lykke Carlsen <plcplc@gmail.com>";
+  pmahoney = "Patrick Mahoney <pat@polycrystal.org>";
+  pmiddend = "Philipp Middendorf <pmidden@secure.mailbox.org>";
+  prikhi = "Pavan Rikhi <pavan.rikhi@gmail.com>";
+  profpatsch = "Profpatsch <mail@profpatsch.de>";
+  psibi = "Sibi <sibi@psibi.in>";
+  pSub = "Pascal Wittmann <mail@pascal-wittmann.de>";
+  puffnfresh = "Brian McKenna <brian@brianmckenna.org>";
+  pxc = "Patrick Callahan <patrick.callahan@latitudeengineering.com>";
+  qknight = "Joachim Schiele <js@lastlog.de>";
+  ragge = "Ragnar Dahlen <r.dahlen@gmail.com>";
+  raskin = "Michael Raskin <7c6f434c@mail.ru>";
+  redbaron = "Maxim Ivanov <ivanov.maxim@gmail.com>";
+  refnil = "Martin Lavoie <broemartino@gmail.com>";
+  relrod = "Ricky Elrod <ricky@elrod.me>";
+  renzo = "Renzo Carbonara <renzocarbonara@gmail.com>";
+  rick68 = "Wei-Ming Yang <rick68@gmail.com>";
+  rickynils = "Rickard Nilsson <rickynils@gmail.com>";
+  rnhmjoj = "Michele Guerini Rocco <micheleguerinirocco@me.com>";
+  rob = "Rob Vermaas <rob.vermaas@gmail.com>";
+  robberer = "Longrin Wischnewski <robberer@freakmail.de>";
+  robbinch = "Robbin C. <robbinch33@gmail.com>";
+  robgssp = "Rob Glossop <robgssp@gmail.com>";
+  roconnor = "Russell O'Connor <roconnor@theorem.ca>";
+  romildo = "José Romildo Malaquias <malaquias@gmail.com>";
+  rszibele = "Richard Szibele <richard_szibele@hotmail.com>";
+  rushmorem = "Rushmore Mushambi <rushmore@webenchanter.com>";
+  rvl = "Rodney Lorrimar <dev+nix@rodney.id.au>";
+  rvlander = "Gaëtan André <rvlander@gaetanandre.eu>";
+  ryantm = "Ryan Mulligan <ryan@ryantm.com>";
+  rycee = "Robert Helgesson <robert@rycee.net>";
+  samuelrivas = "Samuel Rivas <samuelrivas@gmail.com>";
+  sander = "Sander van der Burg <s.vanderburg@tudelft.nl>";
+  schmitthenner = "Fabian Schmitthenner <development@schmitthenner.eu>";
+  schristo = "Scott Christopher <schristopher@konputa.com>";
+  sepi = "Raffael Mancini <raffael@mancini.lu>";
+  sheganinans = "Aistis Raulinaitis <sheganinans@gmail.com>";
+  shell = "Shell Turner <cam.turn@gmail.com>";
+  shlevy = "Shea Levy <shea@shealevy.com>";
+  simons = "Peter Simons <simons@cryp.to>";
+  simonvandel = "Simon Vandel Sillesen <simon.vandel@gmail.com>";
+  sjagoe = "Simon Jagoe <simon@simonjagoe.com>";
+  sjmackenzie = "Stewart Mackenzie <setori88@gmail.com>";
+  sjourdois = "Stéphane ‘kwisatz’ Jourdois <sjourdois@gmail.com>";
+  skeidel = "Sven Keidel <svenkeidel@gmail.com>";
+  sleexyz = "Sean Lee <freshdried@gmail.com>";
+  smironov = "Sergey Mironov <ierton@gmail.com>";
+  spacefrogg = "Michael Raitza <spacefrogg-nixos@meterriblecrew.net>";
+  spencerjanssen = "Spencer Janssen <spencerjanssen@gmail.com>";
+  spinus = "Tomasz Czyż <tomasz.czyz@gmail.com>";
+  sprock = "Roger Mason <rmason@mun.ca>";
+  spwhitt = "Spencer Whitt <sw@swhitt.me>";
+  stephenmw = "Stephen Weinberg <stephen@q5comm.com>";
+  steveej = "Stefan Junker <mail@stefanjunker.de>";
+  szczyp = "Szczyp <qb@szczyp.com>";
+  sztupi = "Attila Sztupak <attila.sztupak@gmail.com>";
+  taeer = "Taeer Bar-Yam <taeer@necsi.edu>";
+  tailhook = "Paul Colomiets <paul@colomiets.name>";
+  taktoa = "Remy Goldschmidt <taktoa@gmail.com>";
+  tavyc = "Octavian Cerna <octavian.cerna@gmail.com>";
+  telotortium = "Robert Irelan <rirelan@gmail.com>";
+  thall = "Niclas Thall <niclas.thall@gmail.com>";
+  thammers = "Tobias Hammerschmidt <jawr@gmx.de>";
+  the-kenny = "Moritz Ulrich <moritz@tarn-vedra.de>";
+  theuni = "Christian Theune <ct@flyingcircus.io>";
+  thoughtpolice = "Austin Seipp <aseipp@pobox.com>";
+  titanous = "Jonathan Rudenberg <jonathan@titanous.com>";
+  tohl = "Tomas Hlavaty <tom@logand.com>";
+  tokudan = "Daniel Frank <git@danielfrank.net>";
+  tomberek = "Thomas Bereknyei <tomberek@gmail.com>";
+  travisbhartwell = "Travis B. Hartwell <nafai@travishartwell.net>";
+  trino = "Hubert Mühlhans <muehlhans.hubert@ekodia.de>";
+  tstrobel = "Thomas Strobel <ts468@cam.ac.uk>";
+  ttuegel = "Thomas Tuegel <ttuegel@gmail.com>";
+  tv = "Tomislav Viljetić <tv@shackspace.de>";
+  tvestelind = "Tomas Vestelind <tomas.vestelind@fripost.org>";
+  twey = "James ‘Twey’ Kay <twey@twey.co.uk>";
+  urkud = "Yury G. Kudryashov <urkud+nix@ya.ru>";
+  vandenoever = "Jos van den Oever <jos@vandenoever.info>";
+  vanzef = "Ivan Solyankin <vanzef@gmail.com>";
+  vbgl = "Vincent Laporte <Vincent.Laporte@gmail.com>";
+  vbmithr = "Vincent Bernardoff <vb@luminar.eu.org>";
+  vcunat = "Vladimír Čunát <vcunat@gmail.com>";
+  viric = "Lluís Batlle i Rossell <viric@viric.name>";
+  vizanto = "Danny Wilson <danny@prime.vc>";
+  vlstill = "Vladimír Štill <xstill@fi.muni.cz>";
+  vmandela = "Venkateswara Rao Mandela <venkat.mandela@gmail.com>";
+  vozz = "Oliver Hunt <oliver.huntuk@gmail.com>";
+  wedens = "wedens <kirill.wedens@gmail.com>";
+  willtim = "Tim Philip Williams <tim.williams.public@gmail.com>";
+  winden = "Antonio Vargas Gonzalez <windenntw@gmail.com>";
+  wizeman = "Ricardo M. Correia <rcorreia@wizy.org>";
+  wjlroe = "William Roe <willroe@gmail.com>";
+  wkennington = "William A. Kennington III <william@wkennington.com>";
+  wmertens = "Wout Mertens <Wout.Mertens@gmail.com>";
+  womfoo = "Kranium Gikos Mendoza <kranium@gikos.net>";
+  wscott = "Wayne Scott <wsc9tt@gmail.com>";
+  wyvie = "Elijah Rum <elijahrum@gmail.com>";
+  yarr = "Dmitry V. <savraz@gmail.com>";
+  z77z = "Marco Maggesi <maggesi@math.unifi.it>";
+  zagy = "Christian Zagrodnick <cz@flyingcircus.io>";
+  zef = "Zef Hemel <zef@zef.me>";
+  zimbatm = "zimbatm <zimbatm@zimbatm.com>";
+  zohl = "Al Zohali <zohl@fmap.me>";
+  zoomulator = "Kim Simmons <zoomulator@gmail.com>";
+}
--- a/lib/meta.nix
+++ b/lib/meta.nix
@@ -1,7 +1,8 @@
 /* Some functions for manipulating meta attributes, as well as the
   name attribute. */

-{ lib }:
+let lib = import ./default.nix;
+in

 rec {

@@ -16,11 +17,6 @@ rec {
    drv // { meta = (drv.meta or {}) // newAttrs; };


-  /* Disable Hydra builds of given derivation.
-  */
-  dontDistribute = drv: addMetaAttrs { hydraPlatforms = []; } drv;
-
-
  /* Change the symbolic name of a package for presentation purposes
     (i.e., so that nix-env users can tell them apart).
  */
@@ -49,7 +45,7 @@ rec {
  /* Decrease the nix-env priority of the package, i.e., other
     versions/variants of the package will be preferred.
  */
-  lowPrio = drv: addMetaAttrs { priority = 10; } drv;
+  lowPrio = drv: addMetaAttrs { priority = "10"; } drv;


  /* Apply lowPrio to an attrset with derivations
@@ -60,30 +56,11 @@ rec {
  /* Increase the nix-env priority of the package, i.e., this
     version/variant of the package will be preferred.
  */
-  hiPrio = drv: addMetaAttrs { priority = -10; } drv;
+  hiPrio = drv: addMetaAttrs { priority = "-10"; } drv;


  /* Apply hiPrio to an attrset with derivations
  */
  hiPrioSet = set: mapDerivationAttrset hiPrio set;

-
-  /* Check to see if a platform is matched by the given `meta.platforms`
-     element.
-
-     A `meta.platform` pattern is either
-
-       1. (legacy) a system string.
-
-       2. (modern) a pattern for the platform `parsed` field.
-
-     We can inject these into a patten for the whole of a structured platform,
-     and then match that.
-  */
-  platformMatch = platform: elem: let
-      pattern =
-        if builtins.isString elem
-        then { system = elem; }
-        else { parsed = elem; };
-    in lib.matchAttrs pattern platform;
 }
--- a/lib/minver.nix
+++ b/lib/minver.nix
@@ -1,2 +1,2 @@
 # Expose the minimum required version for evaluating Nixpkgs
-"1.11"
+"1.10"
--- a/lib/modules.nix
+++ b/lib/modules.nix
@@ -1,12 +1,9 @@
-{ lib }:
-
-with lib.lists;
-with lib.strings;
-with lib.trivial;
-with lib.attrsets;
-with lib.options;
-with lib.debug;
-with lib.types;
+with import ./lists.nix;
+with import ./trivial.nix;
+with import ./attrsets.nix;
+with import ./options.nix;
+with import ./debug.nix;
+with import ./types.nix;

 rec {

@@ -22,8 +19,7 @@ rec {
                , prefix ? []
                , # This should only be used for special arguments that need to be evaluated
                  # when resolving module structure (like in imports). For everything else,
-                  # there's _module.args. If specialArgs.modulesPath is defined it will be
-                  # used as the base path for disabledModules.
+                  # there's _module.args.
                  specialArgs ? {}
                , # This would be remove in the future, Prefer _module.args option instead.
                  args ? {}
@@ -59,9 +55,12 @@ rec {
        };
      };

-      closed = closeModules (modules ++ [ internalModule ]) ({ inherit config options lib; } // specialArgs);
+      closed = closeModules (modules ++ [ internalModule ]) ({ inherit config options; lib = import ./.; } // specialArgs);

-      options = mergeModules prefix (reverseList (filterModules (specialArgs.modulesPath or "") closed));
+      # Note: the list of modules is reversed to maintain backward
+      # compatibility with the old module system.  Not sure if this is
+      # the most sensible policy.
+      options = mergeModules prefix (reverseList closed);

      # Traverse options and extract the option values into the final
      # config set.  At the same time, check whether all option
@@ -87,20 +86,10 @@ rec {
      result = { inherit options config; };
    in result;

-
- # Filter disabled modules. Modules can be disabled allowing
- # their implementation to be replaced.
- filterModules = modulesPath: modules:
-   let
-     moduleKey = m: if isString m then toString modulesPath + "/" + m else toString m;
-     disabledKeys = map moduleKey (concatMap (m: m.disabledModules) modules);
-   in
-     filter (m: !(elem m.key disabledKeys)) modules;
-
  /* Close a set of modules under the ‘imports’ relation. */
  closeModules = modules: args:
    let
-      toClosureList = file: parentKey: imap1 (n: x:
+      toClosureList = file: parentKey: imap (n: x:
        if isAttrs x || isFunction x then
          let key = "${parentKey}:anon-${toString n}"; in
          unifyModuleSyntax file key (unpackSubmodule (applyIfFunction key) x args)
@@ -116,29 +105,23 @@ rec {
  /* Massage a module into canonical form, that is, a set consisting
     of ‘options’, ‘config’ and ‘imports’ attributes. */
  unifyModuleSyntax = file: key: m:
-    let metaSet = if m ? meta
-      then { meta = m.meta; }
-      else {};
-    in
    if m ? config || m ? options then
-      let badAttrs = removeAttrs m ["_file" "key" "disabledModules" "imports" "options" "config" "meta"]; in
+      let badAttrs = removeAttrs m ["imports" "options" "config" "key" "_file"]; in
      if badAttrs != {} then
        throw "Module `${key}' has an unsupported attribute `${head (attrNames badAttrs)}'. This is caused by assignments to the top-level attributes `config' or `options'."
      else
        { file = m._file or file;
          key = toString m.key or key;
-          disabledModules = m.disabledModules or [];
          imports = m.imports or [];
          options = m.options or {};
-          config = mkMerge [ (m.config or {}) metaSet ];
+          config = m.config or {};
        }
    else
      { file = m._file or file;
        key = toString m.key or key;
-        disabledModules = m.disabledModules or [];
        imports = m.require or [] ++ m.imports or [];
        options = {};
-        config = mkMerge [ (removeAttrs m ["_file" "key" "disabledModules" "require" "imports"]) metaSet ];
+        config = removeAttrs m ["key" "_file" "require" "imports"];
      };

  applyIfFunction = key: f: args@{ config, options, lib, ... }: if isFunction f then
@@ -155,11 +138,11 @@ rec {
      # a module will resolve strictly the attributes used as argument but
      # not their values.  The values are forwarding the result of the
      # evaluation of the option.
-      requiredArgs = builtins.attrNames (lib.functionArgs f);
+      requiredArgs = builtins.attrNames (builtins.functionArgs f);
      context = name: ''while evaluating the module argument `${name}' in "${key}":'';
      extraArgs = builtins.listToAttrs (map (name: {
        inherit name;
-        value = builtins.addErrorContext (context name)
+        value = addErrorContext (context name)
          (args.${name} or config._module.args.${name});
      }) requiredArgs);

@@ -192,53 +175,29 @@ rec {
      (concatMap (m: map (config: { inherit (m) file; inherit config; }) (pushDownProperties m.config)) modules);

  mergeModules' = prefix: options: configs:
-    let
-     /* byName is like foldAttrs, but will look for attributes to merge in the
-        specified attribute name.
-
-        byName "foo" (module: value: ["module.hidden=${module.hidden},value=${value}"])
-        [
-          {
-            hidden="baz";
-            foo={qux="bar"; gla="flop";};
-          }
-          {
-            hidden="fli";
-            foo={qux="gne"; gli="flip";};
-          }
-        ]
-        ===>
-        {
-          gla = [ "module.hidden=baz,value=flop" ];
-          gli = [ "module.hidden=fli,value=flip" ];
-          qux = [ "module.hidden=baz,value=bar" "module.hidden=fli,value=gne" ];
-        }
-      */
-      byName = attr: f: modules: foldl' (acc: module:
-        foldl' (inner: name:
-          inner // { ${name} = (acc.${name} or []) ++ (f module module.${attr}.${name}); }
-          ) acc (attrNames module.${attr})
-        ) {} modules;
-      # an attrset 'name' => list of submodules that declare ‘name’.
-      declsByName = byName "options"
-        (module: option: [{ inherit (module) file; options = option; }])
-        options;
-      # an attrset 'name' => list of submodules that define ‘name’.
-      defnsByName = byName "config" (module: value:
-        map (config: { inherit (module) file; inherit config; }) (pushDownProperties value)
-        ) configs;
-      # extract the definitions for each loc
-      defnsByName' = byName "config"
-        (module: value: [{ inherit (module) file; inherit value; }])
-        configs;
-    in
-    (flip mapAttrs declsByName (name: decls:
+    listToAttrs (map (name: {
      # We're descending into attribute ‘name’.
+      inherit name;
+      value =
        let
          loc = prefix ++ [name];
-          defns = defnsByName.${name} or [];
-          defns' = defnsByName'.${name} or [];
+          # Get all submodules that declare ‘name’.
+          decls = concatMap (m:
+            if m.options ? ${name}
+              then [ { inherit (m) file; options = m.options.${name}; } ]
+              else []
+            ) options;
+          # Get all submodules that define ‘name’.
+          defns = concatMap (m:
+            if m.config ? ${name}
+              then map (config: { inherit (m) file; inherit config; })
+                (pushDownProperties m.config.${name})
+              else []
+            ) configs;
          nrOptions = count (m: isOption m.options) decls;
+          # Extract the definitions for this loc
+          defns' = map (m: { inherit (m) file; value = m.config.${name}; })
+            (filter (m: m.config ? ${name}) configs);
        in
          if nrOptions == length decls then
            let opt = fixupOptionType loc (mergeOptionDecls loc decls);
@@ -250,8 +209,8 @@ rec {
            in
              throw "The option `${showOption loc}' in `${firstOption.file}' is a prefix of options in `${firstNonOption.file}'."
          else
-            mergeModules' loc decls defns
-      ))
+            mergeModules' loc decls defns;
+    }) (concatMap (m: attrNames m.options) options))
    // { _definedNames = map (m: { inherit (m) file; names = attrNames m.config; }) configs; };

  /* Merge multiple option declarations into a single declaration.  In
@@ -267,20 +226,12 @@ rec {
     correspond to the definition of 'loc' in 'opt.file'. */
  mergeOptionDecls = loc: opts:
    foldl' (res: opt:
-      let t  = res.type;
-          t' = opt.options.type;
-          mergedType = t.typeMerge t'.functor;
-          typesMergeable = mergedType != null;
-          typeSet = if (bothHave "type") && typesMergeable
-                       then { type = mergedType; }
-                       else {};
-          bothHave = k: opt.options ? ${k} && res ? ${k};
-      in
-      if bothHave "default" ||
-         bothHave "example" ||
-         bothHave "description" ||
-         bothHave "apply" ||
-         (bothHave "type" && (! typesMergeable))
+      if opt.options ? default && res ? default ||
+         opt.options ? example && res ? example ||
+         opt.options ? description && res ? description ||
+         opt.options ? apply && res ? apply ||
+         # Accept to merge options which have identical types.
+         opt.options ? type && res ? type && opt.options.type.name != res.type.name
      then
        throw "The option `${showOption loc}' in `${opt.file}' is already declared in ${showFiles res.declarations}."
      else
@@ -302,7 +253,7 @@ rec {
        in opt.options // res //
          { declarations = res.declarations ++ [opt.file];
            options = submodules;
-          } // typeSet
+          }
    ) { inherit loc; declarations = []; options = []; } opts;

  /* Merge all the definitions of an option to produce the final
@@ -333,8 +284,7 @@ rec {
          res.mergedValue;

    in opt //
-      { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
-        inherit (res.defsFinal') highestPrio;
+      { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
        definitions = map (def: def.value) res.defsFinal;
        files = map (def: def.file) res.defsFinal;
        inherit (res) isDefined;
@@ -342,7 +292,7 @@ rec {

  # Merge definitions of a value of a given type.
  mergeDefinitions = loc: type: defs: rec {
-    defsFinal' =
+    defsFinal =
      let
        # Process mkMerge and mkIf properties.
        defs' = concatMap (m:
@@ -350,25 +300,20 @@ rec {
        ) defs;

        # Process mkOverride properties.
-        defs'' = filterOverrides' defs';
+        defs'' = filterOverrides defs';

        # Sort mkOrder properties.
        defs''' =
          # Avoid sorting if we don't have to.
-          if any (def: def.value._type or "" == "order") defs''.values
-          then sortProperties defs''.values
-          else defs''.values;
-      in {
-        values = defs''';
-        inherit (defs'') highestPrio;
-      };
-
-    defsFinal = defsFinal'.values;
+          if any (def: def.value._type or "" == "order") defs''
+          then sortProperties defs''
+          else defs'';
+      in defs''';

    # Type-check the remaining definitions, and merge them.
    mergedValue = foldl' (res: def:
      if type.check def.value then res
-      else throw "The option value `${showOption loc}' in `${def.file}' is not of type `${type.description}'.")
+      else throw "The option value `${showOption loc}' in `${def.file}' is not a ${type.name}.")
      (type.merge loc defsFinal) defsFinal;

    isDefined = defsFinal != [];
@@ -417,13 +362,10 @@ rec {
    if def._type or "" == "merge" then
      concatMap dischargeProperties def.contents
    else if def._type or "" == "if" then
-      if isBool def.condition then
-        if def.condition then
-          dischargeProperties def.content
-        else
-          [ ]
+      if def.condition then
+        dischargeProperties def.content
      else
-        throw "‘mkIf’ called with a non-Boolean condition"
+        [ ]
    else
      [ def ];

@@ -446,21 +388,16 @@ rec {

     Note that "z" has the default priority 100.
  */
-  filterOverrides = defs: (filterOverrides' defs).values;
-
-  filterOverrides' = defs:
+  filterOverrides = defs:
    let
      defaultPrio = 100;
      getPrio = def: if def.value._type or "" == "override" then def.value.priority else defaultPrio;
      highestPrio = foldl' (prio: def: min (getPrio def) prio) 9999 defs;
      strip = def: if def.value._type or "" == "override" then def // { value = def.value.content; } else def;
-    in {
-      values = concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
-      inherit highestPrio;
-    };
+    in concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;

  /* Sort a list of properties.  The sort priority of a property is
-     1000 by default, but can be overridden by wrapping the property
+     1000 by default, but can be overriden by wrapping the property
     using mkOrder. */
  sortProperties = defs:
    let
@@ -480,14 +417,12 @@ rec {
      options = opt.options or
        (throw "Option `${showOption loc'}' has type optionSet but has no option attribute, in ${showFiles opt.declarations}.");
      f = tp:
-        let optionSetIn = type: (tp.name == type) && (tp.functor.wrapped.name == "optionSet");
-        in
        if tp.name == "option set" || tp.name == "submodule" then
          throw "The option ${showOption loc} uses submodules without a wrapping type, in ${showFiles opt.declarations}."
-        else if optionSetIn "attrsOf" then types.attrsOf (types.submodule options)
-        else if optionSetIn "loaOf"   then types.loaOf   (types.submodule options)
-        else if optionSetIn "listOf"  then types.listOf  (types.submodule options)
-        else if optionSetIn "nullOr"  then types.nullOr  (types.submodule options)
+        else if tp.name == "attribute set of option sets" then types.attrsOf (types.submodule options)
+        else if tp.name == "list or attribute set of option sets" then types.loaOf (types.submodule options)
+        else if tp.name == "list of option sets" then types.listOf (types.submodule options)
+        else if tp.name == "null or option set" then types.nullOr (types.submodule options)
        else tp;
    in
      if opt.type.getSubModules or null == null
@@ -517,7 +452,7 @@ rec {
      inherit priority content;
    };

-  mkOptionDefault = mkOverride 1500; # priority of option defaults
+  mkOptionDefault = mkOverride 1001; # priority of option defaults
  mkDefault = mkOverride 1000; # used in config sections of non-user modules to set a default
  mkForce = mkOverride 50;
  mkVMOverride = mkOverride 10; # used by ‘nixos-rebuild build-vm’
@@ -556,7 +491,9 @@ rec {
  #
  mkAliasDefinitions = mkAliasAndWrapDefinitions id;
  mkAliasAndWrapDefinitions = wrap: option:
-    mkIf (isOption option && option.isDefined) (wrap (mkMerge option.definitions));
+    mkMerge
+      (optional (isOption option && option.isDefined)
+        (wrap (mkMerge option.definitions)));


  /* Compatibility. */
@@ -566,25 +503,19 @@ rec {
  /* Return a module that causes a warning to be shown if the
     specified option is defined. For example,

-       mkRemovedOptionModule [ "boot" "loader" "grub" "bootDevice" ] "<replacement instructions>"
+       mkRemovedOptionModule [ "boot" "loader" "grub" "bootDevice" ]

     causes a warning if the user defines boot.loader.grub.bootDevice.
-
-     replacementInstructions is a string that provides instructions on
-     how to achieve the same functionality without the removed option,
-     or alternatively a reasoning why the functionality is not needed.
-     replacementInstructions SHOULD be provided!
  */
-  mkRemovedOptionModule = optionName: replacementInstructions:
+  mkRemovedOptionModule = optionName:
    { options, ... }:
    { options = setAttrByPath optionName (mkOption {
        visible = false;
      });
      config.warnings =
        let opt = getAttrFromPath optionName options; in
-        optional opt.isDefined ''
-            The option definition `${showOption optionName}' in ${showFiles opt.files} no longer has any effect; please remove it.
-            ${replacementInstructions}'';
+        optional opt.isDefined
+          "The option definition `${showOption optionName}' in ${showFiles opt.files} no longer has any effect; please remove it.";
    };

  /* Return a module that causes a warning to be shown if the
@@ -604,84 +535,6 @@ rec {
    use = builtins.trace "Obsolete option `${showOption from}' is used. It was renamed to `${showOption to}'.";
  };

-  /* Return a module that causes a warning to be shown if any of the "from"
-     option is defined; the defined values can be used in the "mergeFn" to set
-     the "to" value.
-     This function can be used to merge multiple options into one that has a
-     different type.
-
-     "mergeFn" takes the module "config" as a parameter and must return a value
-     of "to" option type.
-
-       mkMergedOptionModule
-         [ [ "a" "b" "c" ]
-           [ "d" "e" "f" ] ]
-         [ "x" "y" "z" ]
-         (config:
-           let value = p: getAttrFromPath p config;
-           in
-           if      (value [ "a" "b" "c" ]) == true then "foo"
-           else if (value [ "d" "e" "f" ]) == true then "bar"
-           else "baz")
-
-     - options.a.b.c is a removed boolean option
-     - options.d.e.f is a removed boolean option
-     - options.x.y.z is a new str option that combines a.b.c and d.e.f
-       functionality
-
-     This show a warning if any a.b.c or d.e.f is set, and set the value of
-     x.y.z to the result of the merge function
-  */
-  mkMergedOptionModule = from: to: mergeFn:
-    { config, options, ... }:
-    {
-      options = foldl recursiveUpdate {} (map (path: setAttrByPath path (mkOption {
-        visible = false;
-        # To use the value in mergeFn without triggering errors
-        default = "_mkMergedOptionModule";
-      })) from);
-
-      config = {
-        warnings = filter (x: x != "") (map (f:
-          let val = getAttrFromPath f config;
-              opt = getAttrFromPath f options;
-          in
-          optionalString
-            (val != "_mkMergedOptionModule")
-            "The option `${showOption f}' defined in ${showFiles opt.files} has been changed to `${showOption to}' that has a different type. Please read `${showOption to}' documentation and update your configuration accordingly."
-        ) from);
-      } // setAttrByPath to (mkMerge
-             (optional
-               (any (f: (getAttrFromPath f config) != "_mkMergedOptionModule") from)
-               (mergeFn config)));
-    };
-
-  /* Single "from" version of mkMergedOptionModule.
-     Return a module that causes a warning to be shown if the "from" option is
-     defined; the defined value can be used in the "mergeFn" to set the "to"
-     value.
-     This function can be used to change an option into another that has a
-     different type.
-
-     "mergeFn" takes the module "config" as a parameter and must return a value of
-     "to" option type.
-
-       mkChangedOptionModule [ "a" "b" "c" ] [ "x" "y" "z" ]
-         (config:
-           let value = getAttrFromPath [ "a" "b" "c" ] config;
-           in
-           if   value > 100 then "high"
-           else "normal")
-
-     - options.a.b.c is a removed int option
-     - options.x.y.z is a new str option that supersedes a.b.c
-
-     This show a warning if a.b.c is set, and set the value of x.y.z to the
-     result of the change function
-  */
-  mkChangedOptionModule = from: to: changeFn:
-    mkMergedOptionModule [ from ] to changeFn;
-
  /* Like ‘mkRenamedOptionModule’, but doesn't show a warning. */
  mkAliasOptionModule = from: to: doRename {
    inherit from to;
@@ -691,25 +544,23 @@ rec {
  };

  doRename = { from, to, visible, warn, use }:
-    { config, options, ... }:
    let
-      fromOpt = getAttrFromPath from options;
      toOf = attrByPath to
-        (abort "Renaming error: option `${showOption to}' does not exist.");
+        (abort "Renaming error: option `${showOption to}' does not exists.");
    in
-    {
-      options = setAttrByPath from (mkOption {
-        inherit visible;
-        description = "Alias of <option>${showOption to}</option>.";
-        apply = x: use (toOf config);
-      });
-      config = mkMerge [
-        {
-          warnings = optional (warn && fromOpt.isDefined)
-            "The option `${showOption from}' defined in ${showFiles fromOpt.files} has been renamed to `${showOption to}'.";
-        }
-        (mkAliasAndWrapDefinitions (setAttrByPath to) fromOpt)
-      ];
-    };
+      { config, options, ... }:
+      { options = setAttrByPath from (mkOption {
+          description = "Alias of <option>${showOption to}</option>.";
+          apply = x: use (toOf config);
+        });
+        config = {
+        /*
+          warnings =
+            let opt = getAttrFromPath from options; in
+            optional (warn && opt.isDefined)
+              "The option `${showOption from}' defined in ${showFiles opt.files} has been renamed to `${showOption to}'.";
+              */
+        } // setAttrByPath to (mkAliasDefinitions (getAttrFromPath from options));
+      };

 }
--- a/lib/options.nix
+++ b/lib/options.nix
@@ -1,78 +1,40 @@
 # Nixpkgs/NixOS option handling.
-{ lib }:

-with lib.trivial;
-with lib.lists;
-with lib.attrsets;
-with lib.strings;
+let lib = import ./default.nix; in
+
+with import ./trivial.nix;
+with import ./lists.nix;
+with import ./attrsets.nix;
+with import ./strings.nix;

 rec {
-  /* Returns true when the given argument is an option

-     Type: isOption :: a -> bool
-
-     Example:
-       isOption 1             // => false
-       isOption (mkOption {}) // => true
-  */
  isOption = lib.isType "option";
-
-  /* Creates an Option attribute set. mkOption accepts an attribute set with the following keys:
-
-     All keys default to `null` when not given.
-
-     Example:
-       mkOption { }  // => { _type = "option"; }
-       mkOption { defaultText = "foo"; } // => { _type = "option"; defaultText = "foo"; }
-  */
  mkOption =
-    {
-    # Default value used when no definition is given in the configuration.
-    default ? null,
-    # Textual representation of the default, for the manual.
-    defaultText ? null,
-    # Example value used in the manual.
-    example ? null,
-    # String describing the option.
-    description ? null,
-    # Related packages used in the manual (see `genRelatedPackages` in ../nixos/doc/manual/default.nix).
-    relatedPackages ? null,
-    # Option type, providing type-checking and value merging.
-    type ? null,
-    # Function that converts the option value to something else.
-    apply ? null,
-    # Whether the option is for NixOS developers only.
-    internal ? null,
-    # Whether the option shows up in the manual.
-    visible ? null,
-    # Whether the option can be set only once
-    readOnly ? null,
-    # Obsolete, used by types.optionSet.
-    options ? null
+    { default ? null # Default value used when no definition is given in the configuration.
+    , defaultText ? null # Textual representation of the default, for in the manual.
+    , example ? null # Example value used in the manual.
+    , description ? null # String describing the option.
+    , type ? null # Option type, providing type-checking and value merging.
+    , apply ? null # Function that converts the option value to something else.
+    , internal ? null # Whether the option is for NixOS developers only.
+    , visible ? null # Whether the option shows up in the manual.
+    , readOnly ? null # Whether the option can be set only once
+    , options ? null # Obsolete, used by types.optionSet.
    } @ attrs:
    attrs // { _type = "option"; };

-  /* Creates an Option attribute set for a boolean value option i.e an
-     option to be toggled on or off:
-
-     Example:
-       mkEnableOption "foo"
-       => { _type = "option"; default = false; description = "Whether to enable foo."; example = true; type = { ... }; }
-  */
-  mkEnableOption =
-    # Name for the created option
-    name: mkOption {
+  mkEnableOption = name: mkOption {
    default = false;
    example = true;
    description = "Whether to enable ${name}.";
    type = lib.types.bool;
  };

-  /* This option accepts anything, but it does not produce any result.
-
-     This is useful for sharing a module across different module sets
-     without having to implement similar features as long as the
-     values of the options are not accessed. */
+  # This option accept anything, but it does not produce any result.  This
+  # is useful for sharing a module across different module sets without
+  # having to implement similar features as long as the value of the options
+  # are not expected.
  mkSinkUndeclaredOptions = attrs: mkOption ({
    internal = true;
    visible = false;
@@ -112,26 +74,10 @@ rec {
      else
        val) (head defs).value defs;

-  /* Extracts values of all "value" keys of the given list.
-
-     Type: getValues :: [ { value :: a } ] -> [a]
-
-     Example:
-       getValues [ { value = 1; } { value = 2; } ] // => [ 1 2 ]
-       getValues [ ]                               // => [ ]
-  */
  getValues = map (x: x.value);
-
-  /* Extracts values of all "file" keys of the given list
-
-     Type: getFiles :: [ { file :: a } ] -> [a]
-
-     Example:
-       getFiles [ { file = "file1"; } { file = "file2"; } ] // => [ "file1" "file2" ]
-       getFiles [ ]                                         // => [ ]
-  */
  getFiles = map (x: x.file);

+
  # Generate documentation template from the list of option declaration like
  # the set generated with filterOptionSets.
  optionAttrSetToDocList = optionAttrSetToDocList' [];
@@ -140,19 +86,17 @@ rec {
    concatMap (opt:
      let
        docOption = rec {
-          loc = opt.loc;
          name = showOption opt.loc;
          description = opt.description or (throw "Option `${name}' has no description.");
          declarations = filter (x: x != unknownModule) opt.declarations;
          internal = opt.internal or false;
          visible = opt.visible or true;
          readOnly = opt.readOnly or false;
-          type = opt.type.description or null;
+          type = opt.type.name or null;
        }
-        // optionalAttrs (opt ? example) { example = scrubOptionValue opt.example; }
-        // optionalAttrs (opt ? default) { default = scrubOptionValue opt.default; }
-        // optionalAttrs (opt ? defaultText) { default = opt.defaultText; }
-        // optionalAttrs (opt ? relatedPackages && opt.relatedPackages != null) { inherit (opt) relatedPackages; };
+        // (if opt ? example then { example = scrubOptionValue opt.example; } else {})
+        // (if opt ? default then { default = scrubOptionValue opt.default; } else {})
+        // (if opt ? defaultText then { default = opt.defaultText; } else {});

        subOptions =
          let ss = opt.type.getSubOptions opt.loc;
@@ -162,13 +106,10 @@ rec {


  /* This function recursively removes all derivation attributes from
-     `x` except for the `name` attribute.
-
-     This is to make the generation of `options.xml` much more
-     efficient: the XML representation of derivations is very large
-     (on the order of megabytes) and is not actually used by the
-     manual generator.
-  */
+     `x' except for the `name' attribute.  This is to make the
+     generation of `options.xml' much more efficient: the XML
+     representation of derivations is very large (on the order of
+     megabytes) and is not actually used by the manual generator. */
  scrubOptionValue = x:
    if isDerivation x then
      { type = "derivation"; drvPath = x.name; outPath = x.name; name = x.name; }
@@ -177,29 +118,15 @@ rec {
    else x;


-  /* For use in the `example` option attribute. It causes the given
-     text to be included verbatim in documentation. This is necessary
-     for example values that are not simple values, e.g., functions.
-  */
+  /* For use in the ‘example’ option attribute.  It causes the given
+     text to be included verbatim in documentation.  This is necessary
+     for example values that are not simple values, e.g.,
+     functions. */
  literalExample = text: { _type = "literalExample"; inherit text; };

-  # Helper functions.

-  /* Convert an option, described as a list of the option parts in to a
-     safe, human readable version.
-
-     Example:
-       (showOption ["foo" "bar" "baz"]) == "foo.bar.baz"
-       (showOption ["foo" "bar.baz" "tux"]) == "foo.\"bar.baz\".tux"
-  */
-  showOption = parts: let
-    escapeOptionPart = part:
-      let
-        escaped = lib.strings.escapeNixString part;
-      in if escaped == "\"${part}\""
-         then part
-         else escaped;
-    in (concatStringsSep ".") (map escapeOptionPart parts);
+  /* Helper functions. */
+  showOption = concatStringsSep ".";
  showFiles = files: concatStringsSep " and " (map (f: "`${f}'") files);
  unknownModule = "<unknown-file>";

--- a/lib/platforms.nix
+++ b/lib/platforms.nix
@@ -0,0 +1,24 @@
+let lists = import ./lists.nix; in
+
+rec {
+  all = linux ++ darwin ++ cygwin ++ freebsd ++ openbsd ++ netbsd ++ illumos;
+  allBut = platforms: lists.filter (x: !(builtins.elem x platforms)) all;
+  none = [];
+
+  arm = ["armv5tel-linux" "armv6l-linux" "armv7l-linux" ];
+  i686 = ["i686-linux" "i686-freebsd" "i686-netbsd" "i686-cygwin"];
+  mips = [ "mips64el-linux" ];
+  x86_64 = ["x86_64-linux" "x86_64-darwin" "x86_64-freebsd" "x86_64-openbsd" "x86_64-netbsd" "x86_64-cygwin"];
+
+  cygwin = ["i686-cygwin" "x86_64-cygwin"];
+  darwin = ["x86_64-darwin"];
+  freebsd = ["i686-freebsd" "x86_64-freebsd"];
+  gnu = linux; /* ++ hurd ++ kfreebsd ++ ... */
+  illumos = ["x86_64-solaris"];
+  linux = ["i686-linux" "x86_64-linux" "armv5tel-linux" "armv6l-linux" "armv7l-linux" "mips64el-linux"];
+  netbsd = ["i686-netbsd" "x86_64-netbsd"];
+  openbsd = ["i686-openbsd" "x86_64-openbsd"];
+  unix = linux ++ darwin ++ freebsd ++ openbsd ++ netbsd ++ illumos;
+
+  mesaPlatforms = ["i686-linux" "x86_64-linux" "x86_64-darwin" "armv5tel-linux" "armv6l-linux" "armv7l-linux"];
+}
--- a/lib/sandbox.nix
+++ b/lib/sandbox.nix
@@ -0,0 +1,47 @@
+with import ./strings.nix;
+
+/* Helpers for creating lisp S-exprs for the Apple sandbox
+
+lib.sandbox.allowFileRead [ "/usr/bin/file" ];
+  # => "(allow file-read* (literal \"/usr/bin/file\"))";
+
+lib.sandbox.allowFileRead {
+  literal = [ "/usr/bin/file" ];
+  subpath = [ "/usr/lib/system" ];
+}
+  # => "(allow file-read* (literal \"/usr/bin/file\") (subpath \"/usr/lib/system\"))"
+*/
+
+let
+
+sexp = tokens: "(" + builtins.concatStringsSep " " tokens + ")";
+generateFileList = files:
+  if builtins.isList files
+    then concatMapStringsSep " " (x: sexp [ "literal" ''"${x}"'' ]) files
+    else if builtins.isString files
+      then generateFileList [ files ]
+      else concatStringsSep " " (
+        (map (x: sexp [ "literal" ''"${x}"'' ]) (files.literal or [])) ++
+        (map (x: sexp [ "subpath" ''"${x}"'' ]) (files.subpath or []))
+      );
+applyToFiles = f: act: files: f "${act} ${generateFileList files}";
+genActions = actionName: let
+  action = feature: sexp [ actionName feature ];
+  self = {
+    "${actionName}" = action;
+    "${actionName}File" = applyToFiles action "file*";
+    "${actionName}FileRead" = applyToFiles action "file-read*";
+    "${actionName}FileReadMetadata" = applyToFiles action "file-read-metadata";
+    "${actionName}DirectoryList" = self."${actionName}FileReadMetadata";
+    "${actionName}FileWrite" = applyToFiles action "file-write*";
+    "${actionName}FileWriteMetadata" = applyToFiles action "file-write-metadata";
+  };
+  in self;
+
+in
+
+genActions "allow" // genActions "deny" // {
+  importProfile = derivation: ''
+    (import "${derivation}")
+  '';
+}
--- a/lib/sources.nix
+++ b/lib/sources.nix
@@ -1,60 +1,24 @@
 # Functions for copying sources to the Nix store.
-{ lib }:
+
+let lib = import ./default.nix; in

 rec {

-  # Returns the type of a path: regular (for file), symlink, or directory
-  pathType = p: with builtins; getAttr (baseNameOf p) (readDir (dirOf p));
-
-  # Returns true if the path exists and is a directory, false otherwise
-  pathIsDirectory = p: if builtins.pathExists p then (pathType p) == "directory" else false;

  # Bring in a path as a source, filtering out all Subversion and CVS
  # directories, as well as backup files (*~).
-  cleanSourceFilter = name: type: let baseName = baseNameOf (toString name); in ! (
-    # Filter out Subversion and CVS directories.
-    (type == "directory" && (baseName == ".git" || baseName == ".svn" || baseName == "CVS" || baseName == ".hg")) ||
-    # Filter out editor backup / swap files.
-    lib.hasSuffix "~" baseName ||
-    builtins.match "^\\.sw[a-z]$" baseName != null ||
-    builtins.match "^\\..*\\.sw[a-z]$" baseName != null ||
+  cleanSource =
+    let filter = name: type: let baseName = baseNameOf (toString name); in ! (
+      # Filter out Subversion and CVS directories.
+      (type == "directory" && (baseName == ".git" || baseName == ".svn" || baseName == "CVS" || baseName == ".hg")) ||
+      # Filter out backup files.
+      lib.hasSuffix "~" baseName ||
+      # Filter out generates files.
+      lib.hasSuffix ".o" baseName ||
+      lib.hasSuffix ".so" baseName
+    );
+    in src: builtins.filterSource filter src;

-    # Filter out generates files.
-    lib.hasSuffix ".o" baseName ||
-    lib.hasSuffix ".so" baseName ||
-    # Filter out nix-build result symlinks
-    (type == "symlink" && lib.hasPrefix "result" baseName)
-  );
-
-  cleanSource = src: cleanSourceWith { filter = cleanSourceFilter; inherit src; };
-
-  # Like `builtins.filterSource`, except it will compose with itself,
-  # allowing you to chain multiple calls together without any
-  # intermediate copies being put in the nix store.
-  #
-  #     lib.cleanSourceWith f (lib.cleanSourceWith g ./.)     # Succeeds!
-  #     builtins.filterSource f (builtins.filterSource g ./.) # Fails!
-  cleanSourceWith = { filter, src }:
-    let
-      isFiltered = src ? _isLibCleanSourceWith;
-      origSrc = if isFiltered then src.origSrc else src;
-      filter' = if isFiltered then name: type: filter name type && src.filter name type else filter;
-    in {
-      inherit origSrc;
-      filter = filter';
-      outPath = builtins.filterSource filter' origSrc;
-      _isLibCleanSourceWith = true;
-    };
-
-  # Filter sources by a list of regular expressions.
-  #
-  # E.g. `src = sourceByRegex ./my-subproject [".*\.py$" "^database.sql$"]`
-  sourceByRegex = src: regexes: cleanSourceWith {
-    filter = (path: type:
-      let relPath = lib.removePrefix (toString src + "/") (toString path);
-      in lib.any (re: builtins.match re relPath != null) regexes);
-    inherit src;
-  };

  # Get all files ending with the specified suffices from the given
  # directory or its descendants.  E.g. `sourceFilesBySuffices ./dir
@@ -63,38 +27,6 @@ rec {
    let filter = name: type:
      let base = baseNameOf (toString name);
      in type == "directory" || lib.any (ext: lib.hasSuffix ext base) exts;
-    in cleanSourceWith { inherit filter; src = path; };
+    in builtins.filterSource filter path;

-
-  # Get the commit id of a git repo
-  # Example: commitIdFromGitRepo <nixpkgs/.git>
-  commitIdFromGitRepo =
-    let readCommitFromFile = path: file:
-      with builtins;
-        let fileName       = toString path + "/" + file;
-            packedRefsName = toString path + "/packed-refs";
-        in if lib.pathExists fileName
-           then
-             let fileContent = lib.fileContents fileName;
-                 # Sometimes git stores the commitId directly in the file but
-                 # sometimes it stores something like: «ref: refs/heads/branch-name»
-                 matchRef    = match "^ref: (.*)$" fileContent;
-             in if   isNull matchRef
-                then fileContent
-                else readCommitFromFile path (lib.head matchRef)
-           # Sometimes, the file isn't there at all and has been packed away in the
-           # packed-refs file, so we have to grep through it:
-           else if lib.pathExists packedRefsName
-           then
-             let fileContent = readFile packedRefsName;
-                 matchRef    = match (".*\n([^\n ]*) " + file + "\n.*") fileContent;
-             in if   isNull matchRef
-                then throw ("Could not find " + file + " in " + packedRefsName)
-                else lib.head matchRef
-           else throw ("Not a .git directory: " + path);
-    in lib.flip readCommitFromFile "HEAD";
-
-  pathHasContext = builtins.hasContext or (lib.hasPrefix builtins.storeDir);
-
-  canCleanSource = src: src ? _isLibCleanSourceWith || !(pathHasContext (toString src));
 }
--- a/lib/strings-with-deps.nix
+++ b/lib/strings-with-deps.nix
@@ -1,4 +1,3 @@
-{ lib }:
 /*
 Usage:

@@ -16,7 +15,7 @@ Usage:
  Attention:

  let
-    pkgs = (import <nixpkgs>) {};
+    pkgs = (import /etc/nixos/nixpkgs/pkgs/top-level/all-packages.nix) {};
  in let
    inherit (pkgs.stringsWithDeps) fullDepEntry packEntry noDepEntry textClosureMap;
    inherit (pkgs.lib) id;
@@ -41,9 +40,9 @@ Usage:
  [1] maybe this behaviour should be removed to keep things simple (?)
 */

-with lib.lists;
-with lib.attrsets;
-with lib.strings;
+with import ./lists.nix;
+with import ./attrsets.nix;
+with import ./strings.nix;

 rec {

--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -1,6 +1,6 @@
 /* String manipulation functions. */
-{ lib }:
-let
+
+let lib = import ./default.nix;

 inherit (builtins) length;

@@ -10,310 +10,100 @@ rec {

  inherit (builtins) stringLength substring head tail isString replaceStrings;

-  /* Concatenate a list of strings.

-    Type: concatStrings :: [string] -> string
+  # Concatenate a list of strings.
+  concatStrings =
+    if builtins ? concatStringsSep then
+      builtins.concatStringsSep ""
+    else
+      lib.foldl' (x: y: x + y) "";

-     Example:
-       concatStrings ["foo" "bar"]
-       => "foobar"
-  */
-  concatStrings = builtins.concatStringsSep "";

-  /* Map a function over a list and concatenate the resulting strings.
-
-    Type: concatMapStrings :: (a -> string) -> [a] -> string
-
-     Example:
-       concatMapStrings (x: "a" + x) ["foo" "bar"]
-       => "afooabar"
-  */
+  # Map a function over a list and concatenate the resulting strings.
  concatMapStrings = f: list: concatStrings (map f list);
+  concatImapStrings = f: list: concatStrings (lib.imap f list);

-  /* Like `concatMapStrings` except that the f functions also gets the
-     position as a parameter.

-     Type: concatImapStrings :: (int -> a -> string) -> [a] -> string
-
-     Example:
-       concatImapStrings (pos: x: "${toString pos}-${x}") ["foo" "bar"]
-       => "1-foo2-bar"
-  */
-  concatImapStrings = f: list: concatStrings (lib.imap1 f list);
-
-  /* Place an element between each element of a list
-
-     Type: intersperse :: a -> [a] -> [a]
-
-     Example:
-       intersperse "/" ["usr" "local" "bin"]
-       => ["usr" "/" "local" "/" "bin"].
-  */
-  intersperse =
-    # Separator to add between elements
-    separator:
-    # Input list
-    list:
+  # Place an element between each element of a list, e.g.,
+  # `intersperse "," ["a" "b" "c"]' returns ["a" "," "b" "," "c"].
+  intersperse = separator: list:
    if list == [] || length list == 1
    then list
    else tail (lib.concatMap (x: [separator x]) list);

-  /* Concatenate a list of strings with a separator between each element

-     Type: concatStringsSep :: string -> [string] -> string
-
-     Example:
-        concatStringsSep "/" ["usr" "local" "bin"]
-        => "usr/local/bin"
-  */
+  # Concatenate a list of strings with a separator between each element, e.g.
+  # concatStringsSep " " ["foo" "bar" "xyzzy"] == "foo bar xyzzy"
  concatStringsSep = builtins.concatStringsSep or (separator: list:
    concatStrings (intersperse separator list));

-  /* Maps a function over a list of strings and then concatenates the
-     result with the specified separator interspersed between
-     elements.
-
-     Type: concatMapStringsSep :: string -> (string -> string) -> [string] -> string
-
-     Example:
-        concatMapStringsSep "-" (x: toUpper x)  ["foo" "bar" "baz"]
-        => "FOO-BAR-BAZ"
-  */
-  concatMapStringsSep =
-    # Separator to add between elements
-    sep:
-    # Function to map over the list
-    f:
-    # List of input strings
-    list: concatStringsSep sep (map f list);
-
-  /* Same as `concatMapStringsSep`, but the mapping function
-     additionally receives the position of its argument.
-
-     Type: concatMapStringsSep :: string -> (int -> string -> string) -> [string] -> string
-
-     Example:
-       concatImapStringsSep "-" (pos: x: toString (x / pos)) [ 6 6 6 ]
-       => "6-3-2"
-  */
-  concatImapStringsSep =
-    # Separator to add between elements
-    sep:
-    # Function that receives elements and their positions
-    f:
-    # List of input strings
-    list: concatStringsSep sep (lib.imap1 f list);
-
-  /* Construct a Unix-style, colon-separated search path consisting of
-     the given `subDir` appended to each of the given paths.
-
-     Type: makeSearchPath :: string -> [string] -> string
-
-     Example:
-       makeSearchPath "bin" ["/root" "/usr" "/usr/local"]
-       => "/root/bin:/usr/bin:/usr/local/bin"
-       makeSearchPath "bin" [""]
-       => "/bin"
-  */
-  makeSearchPath =
-    # Directory name to append
-    subDir:
-    # List of base paths
-    paths:
-    concatStringsSep ":" (map (path: path + "/" + subDir) (builtins.filter (x: x != null) paths));
-
-  /* Construct a Unix-style search path by appending the given
-     `subDir` to the specified `output` of each of the packages. If no
-     output by the given name is found, fallback to `.out` and then to
-     the default.
-
-     Type: string -> string -> [package] -> string
-
-     Example:
-       makeSearchPathOutput "dev" "bin" [ pkgs.openssl pkgs.zlib ]
-       => "/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev/bin:/nix/store/wwh7mhwh269sfjkm6k5665b5kgp7jrk2-zlib-1.2.8/bin"
-  */
-  makeSearchPathOutput =
-    # Package output to use
-    output:
-    # Directory name to append
-    subDir:
-    # List of packages
-    pkgs: makeSearchPath subDir (map (lib.getOutput output) pkgs);
-
-  /* Construct a library search path (such as RPATH) containing the
-     libraries for a set of packages
-
-     Example:
-       makeLibraryPath [ "/usr" "/usr/local" ]
-       => "/usr/lib:/usr/local/lib"
-       pkgs = import <nixpkgs> { }
-       makeLibraryPath [ pkgs.openssl pkgs.zlib ]
-       => "/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r/lib:/nix/store/wwh7mhwh269sfjkm6k5665b5kgp7jrk2-zlib-1.2.8/lib"
-  */
-  makeLibraryPath = makeSearchPathOutput "lib" "lib";
-
-  /* Construct a binary search path (such as $PATH) containing the
-     binaries for a set of packages.
-
-     Example:
-       makeBinPath ["/root" "/usr" "/usr/local"]
-       => "/root/bin:/usr/bin:/usr/local/bin"
-  */
-  makeBinPath = makeSearchPathOutput "bin" "bin";
+  concatMapStringsSep = sep: f: list: concatStringsSep sep (map f list);
+  concatImapStringsSep = sep: f: list: concatStringsSep sep (lib.imap f list);


-  /* Construct a perl search path (such as $PERL5LIB)
+  # Construct a Unix-style search path consisting of each `subDir"
+  # directory of the given list of packages.  For example,
+  # `makeSearchPath "bin" ["x" "y" "z"]' returns "x/bin:y/bin:z/bin".
+  makeSearchPath = subDir: packages:
+    concatStringsSep ":" (map (path: path + "/" + subDir) packages);

-     Example:
-       pkgs = import <nixpkgs> { }
-       makePerlPath [ pkgs.perlPackages.libnet ]
-       => "/nix/store/n0m1fk9c960d8wlrs62sncnadygqqc6y-perl-Net-SMTP-1.25/lib/perl5/site_perl"
-  */
-  # FIXME(zimbatm): this should be moved in perl-specific code
-  makePerlPath = makeSearchPathOutput "lib" "lib/perl5/site_perl";

-  /* Construct a perl search path recursively including all dependencies (such as $PERL5LIB)
+  # Construct a library search path (such as RPATH) containing the
+  # libraries for a set of packages, e.g. "${pkg1}/lib:${pkg2}/lib:...".
+  makeLibraryPath = makeSearchPath "lib";

-     Example:
-       pkgs = import <nixpkgs> { }
-       makeFullPerlPath [ pkgs.perlPackages.CGI ]
-       => "/nix/store/fddivfrdc1xql02h9q500fpnqy12c74n-perl-CGI-4.38/lib/perl5/site_perl:/nix/store/8hsvdalmsxqkjg0c5ifigpf31vc4vsy2-perl-HTML-Parser-3.72/lib/perl5/site_perl:/nix/store/zhc7wh0xl8hz3y3f71nhlw1559iyvzld-perl-HTML-Tagset-3.20/lib/perl5/site_perl"
-  */
-  makeFullPerlPath = deps: makePerlPath (lib.misc.closePropagation deps);
+  # Construct a binary search path (such as $PATH) containing the
+  # binaries for a set of packages, e.g. "${pkg1}/bin:${pkg2}/bin:...".
+  makeBinPath = makeSearchPath "bin";

-  /* Depending on the boolean `cond', return either the given string
-     or the empty string. Useful to concatenate against a bigger string.

-     Type: optionalString :: bool -> string -> string
+  # Idem for Perl search paths.
+  makePerlPath = makeSearchPath "lib/perl5/site_perl";

-     Example:
-       optionalString true "some-string"
-       => "some-string"
-       optionalString false "some-string"
-       => ""
-  */
-  optionalString =
-    # Condition
-    cond:
-    # String to return if condition is true
-    string: if cond then string else "";

-  /* Determine whether a string has given prefix.
+  # Dependening on the boolean `cond', return either the given string
+  # or the empty string.
+  optionalString = cond: string: if cond then string else "";

-     Type: hasPrefix :: string -> string -> bool

-     Example:
-       hasPrefix "foo" "foobar"
-       => true
-       hasPrefix "foo" "barfoo"
-       => false
-  */
-  hasPrefix =
-    # Prefix to check for
-    pref:
-    # Input string
-    str: substring 0 (stringLength pref) str == pref;
-
-  /* Determine whether a string has given suffix.
-
-     Type: hasSuffix :: string -> string -> bool
-
-     Example:
-       hasSuffix "foo" "foobar"
-       => false
-       hasSuffix "foo" "barfoo"
-       => true
-  */
-  hasSuffix =
-    # Suffix to check for
-    suffix:
-    # Input string
-    content:
+  # Determine whether a string has given prefix/suffix.
+  hasPrefix = pref: str:
+    substring 0 (stringLength pref) str == pref;
+  hasSuffix = suff: str:
    let
-      lenContent = stringLength content;
-      lenSuffix = stringLength suffix;
-    in lenContent >= lenSuffix &&
-       substring (lenContent - lenSuffix) lenContent content == suffix;
+      lenStr = stringLength str;
+      lenSuff = stringLength suff;
+    in lenStr >= lenSuff &&
+       substring (lenStr - lenSuff) lenStr str == suff;

-  /* Convert a string to a list of characters (i.e. singleton strings).
-     This allows you to, e.g., map a function over each character.  However,
-     note that this will likely be horribly inefficient; Nix is not a
-     general purpose programming language. Complex string manipulations
-     should, if appropriate, be done in a derivation.
-     Also note that Nix treats strings as a list of bytes and thus doesn't
-     handle unicode.

-     Type: stringtoCharacters :: string -> [string]
-
-     Example:
-       stringToCharacters ""
-       => [ ]
-       stringToCharacters "abc"
-       => [ "a" "b" "c" ]
-       stringToCharacters "💩"
-       => [ "<EFBFBD>" "<EFBFBD>" "<EFBFBD>" "<EFBFBD>" ]
-  */
+  # Convert a string to a list of characters (i.e. singleton strings).
+  # For instance, "abc" becomes ["a" "b" "c"].  This allows you to,
+  # e.g., map a function over each character.  However, note that this
+  # will likely be horribly inefficient; Nix is not a general purpose
+  # programming language.  Complex string manipulations should, if
+  # appropriate, be done in a derivation.
  stringToCharacters = s:
    map (p: substring p 1 s) (lib.range 0 (stringLength s - 1));

-  /* Manipulate a string character by character and replace them by
-     strings before concatenating the results.

-     Type: stringAsChars :: (string -> string) -> string -> string
-
-     Example:
-       stringAsChars (x: if x == "a" then "i" else x) "nax"
-       => "nix"
-  */
-  stringAsChars =
-    # Function to map over each individual character
-    f:
-    # Input string
-    s: concatStrings (
+  # Manipulate a string charactter by character and replace them by
+  # strings before concatenating the results.
+  stringAsChars = f: s:
+    concatStrings (
      map f (stringToCharacters s)
    );

-  /* Escape occurrence of the elements of `list` in `string` by
-     prefixing it with a backslash.

-     Type: escape :: [string] -> string -> string
-
-     Example:
-       escape ["(" ")"] "(foo)"
-       => "\\(foo\\)"
-  */
+  # Escape occurrence of the elements of ‘list’ in ‘string’ by
+  # prefixing it with a backslash. For example, ‘escape ["(" ")"]
+  # "(foo)"’ returns the string ‘\(foo\)’.
  escape = list: replaceChars list (map (c: "\\${c}") list);

-  /* Quote string to be used safely within the Bourne shell.

-     Type: escapeShellArg :: string -> string
+  # Escape all characters that have special meaning in the Bourne shell.
+  escapeShellArg = lib.escape (stringToCharacters "\\ ';$`()|<>\t*[]");

-     Example:
-       escapeShellArg "esc'ape\nme"
-       => "'esc'\\''ape\nme'"
-  */
-  escapeShellArg = arg: "'${replaceStrings ["'"] ["'\\''"] (toString arg)}'";
-
-  /* Quote all arguments to be safely passed to the Bourne shell.
-
-     Type: escapeShellArgs :: [string] -> string
-
-     Example:
-       escapeShellArgs ["one" "two three" "four'five"]
-       => "'one' 'two three' 'four'\\''five'"
-  */
-  escapeShellArgs = concatMapStringsSep " " escapeShellArg;
-
-  /* Turn a string into a Nix expression representing that string
-
-     Type: string -> string
-
-     Example:
-       escapeNixString "hello\${}\n"
-       => "\"hello\\\${}\\n\""
-  */
-  escapeNixString = s: escape ["$"] (builtins.toJSON s);

  # Obsolete - use replaceStrings instead.
  replaceChars = builtins.replaceStrings or (
@@ -329,56 +119,21 @@ rec {
    in
      stringAsChars subst s);

+
  # Case conversion utilities.
  lowerChars = stringToCharacters "abcdefghijklmnopqrstuvwxyz";
  upperChars = stringToCharacters "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
-
-  /* Converts an ASCII string to lower-case.
-
-     Type: toLower :: string -> string
-
-     Example:
-       toLower "HOME"
-       => "home"
-  */
  toLower = replaceChars upperChars lowerChars;
-
-  /* Converts an ASCII string to upper-case.
-
-     Type: toUpper :: string -> string
-
-     Example:
-       toUpper "home"
-       => "HOME"
-  */
  toUpper = replaceChars lowerChars upperChars;

-  /* Appends string context from another string.  This is an implementation
-     detail of Nix.

-     Strings in Nix carry an invisible `context` which is a list of strings
-     representing store paths.  If the string is later used in a derivation
-     attribute, the derivation will properly populate the inputDrvs and
-     inputSrcs.
-
-     Example:
-       pkgs = import <nixpkgs> { };
-       addContextFrom pkgs.coreutils "bar"
-       => "bar"
-  */
+  # Appends string context from another string.
  addContextFrom = a: b: substring 0 0 a + b;

-  /* Cut a string with a separator and produces a list of strings which
-     were separated by this separator.

-     NOTE: this function is not performant and should never be used.
-
-     Example:
-       splitString "." "foo.bar.baz"
-       => [ "foo" "bar" "baz" ]
-       splitString "/" "/usr/local/bin"
-       => [ "" "usr" "local" "bin" ]
-  */
+  # Cut a string with a separator and produces a list of strings which
+  # were separated by this separator; e.g., `splitString "."
+  # "foo.bar.baz"' returns ["foo" "bar" "baz"].
  splitString = _sep: _s:
    let
      sep = addContextFrom _s _sep;
@@ -391,7 +146,7 @@ rec {

      recurse = index: startAt:
        let cutUntil = i: [(substring startAt (i - startAt) s)]; in
-        if index <= lastSearch then
+        if index < lastSearch then
          if startWithSep index then
            let restartAt = index + sepLen; in
            cutUntil index ++ recurse restartAt restartAt
@@ -402,102 +157,49 @@ rec {
    in
      recurse 0 0;

-  /* Return a string without the specified prefix, if the prefix matches.

-     Type: string -> string -> string
-
-     Example:
-       removePrefix "foo." "foo.bar.baz"
-       => "bar.baz"
-       removePrefix "xxx" "foo.bar.baz"
-       => "foo.bar.baz"
-  */
-  removePrefix =
-    # Prefix to remove if it matches
-    prefix:
-    # Input string
-    str:
+  # return the suffix of the second argument if the first argument match its
+  # prefix. e.g.,
+  # `removePrefix "foo." "foo.bar.baz"' returns "bar.baz".
+  removePrefix = pre: s:
    let
-      preLen = stringLength prefix;
-      sLen = stringLength str;
+      preLen = stringLength pre;
+      sLen = stringLength s;
    in
-      if hasPrefix prefix str then
-        substring preLen (sLen - preLen) str
+      if hasPrefix pre s then
+        substring preLen (sLen - preLen) s
      else
-        str;
+        s;

-  /* Return a string without the specified suffix, if the suffix matches.
-
-     Type: string -> string -> string
-
-     Example:
-       removeSuffix "front" "homefront"
-       => "home"
-       removeSuffix "xxx" "homefront"
-       => "homefront"
-  */
-  removeSuffix =
-    # Suffix to remove if it matches
-    suffix:
-    # Input string
-    str:
+  removeSuffix = suf: s:
    let
-      sufLen = stringLength suffix;
-      sLen = stringLength str;
+      sufLen = stringLength suf;
+      sLen = stringLength s;
    in
-      if sufLen <= sLen && suffix == substring (sLen - sufLen) sufLen str then
-        substring 0 (sLen - sufLen) str
+      if sufLen <= sLen && suf == substring (sLen - sufLen) sufLen s then
+        substring 0 (sLen - sufLen) s
      else
-        str;
+        s;

-  /* Return true if string v1 denotes a version older than v2.
-
-     Example:
-       versionOlder "1.1" "1.2"
-       => true
-       versionOlder "1.1" "1.1"
-       => false
-  */
+  # Return true iff string v1 denotes a version older than v2.
  versionOlder = v1: v2: builtins.compareVersions v2 v1 == 1;

-  /* Return true if string v1 denotes a version equal to or newer than v2.

-     Example:
-       versionAtLeast "1.1" "1.0"
-       => true
-       versionAtLeast "1.1" "1.1"
-       => true
-       versionAtLeast "1.1" "1.2"
-       => false
-  */
+  # Return true iff string v1 denotes a version equal to or newer than v2.
  versionAtLeast = v1: v2: !versionOlder v1 v2;

-  /* This function takes an argument that's either a derivation or a
-     derivation's "name" attribute and extracts the version part from that
-     argument.

-     Example:
-       getVersion "youtube-dl-2016.01.01"
-       => "2016.01.01"
-       getVersion pkgs.youtube-dl
-       => "2016.01.01"
-  */
-  getVersion = x:
-   let
-     parse = drv: (builtins.parseDrvName drv).version;
-   in if isString x
-      then parse x
-      else x.version or (parse x.name);
+  # This function takes an argument that's either a derivation or a
+  # derivation's "name" attribute and extracts the version part from that
+  # argument. For example:
+  #
+  #    lib.getVersion "youtube-dl-2016.01.01" ==> "2016.01.01"
+  #    lib.getVersion pkgs.youtube-dl         ==> "2016.01.01"
+  getVersion = x: (builtins.parseDrvName (x.name or x)).version;

-  /* Extract name with version from URL. Ask for separator which is
-     supposed to start extension.

-     Example:
-       nameFromURL "https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2" "-"
-       => "nix"
-       nameFromURL "https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2" "_"
-       => "nix-1.7-x86"
-  */
+  # Extract name with version from URL. Ask for separator which is
+  # supposed to start extension.
  nameFromURL = url: sep:
    let
      components = splitString "/" url;
@@ -505,62 +207,14 @@ rec {
      name = builtins.head (splitString sep filename);
    in assert name !=  filename; name;

-  /* Create an --{enable,disable}-<feat> string that can be passed to
-     standard GNU Autoconf scripts.

-     Example:
-       enableFeature true "shared"
-       => "--enable-shared"
-       enableFeature false "shared"
-       => "--disable-shared"
-  */
+  # Create an --{enable,disable}-<feat> string that can be passed to
+  # standard GNU Autoconf scripts.
  enableFeature = enable: feat: "--${if enable then "enable" else "disable"}-${feat}";

-  /* Create an --{enable-<feat>=<value>,disable-<feat>} string that can be passed to
-     standard GNU Autoconf scripts.

-     Example:
-       enableFeature true "shared" "foo"
-       => "--enable-shared=foo"
-       enableFeature false "shared" (throw "ignored")
-       => "--disable-shared"
-  */
-  enableFeatureAs = enable: feat: value: enableFeature enable feat + optionalString enable "=${value}";
-
-  /* Create an --{with,without}-<feat> string that can be passed to
-     standard GNU Autoconf scripts.
-
-     Example:
-       withFeature true "shared"
-       => "--with-shared"
-       withFeature false "shared"
-       => "--without-shared"
-  */
-  withFeature = with_: feat: "--${if with_ then "with" else "without"}-${feat}";
-
-  /* Create an --{with-<feat>=<value>,without-<feat>} string that can be passed to
-     standard GNU Autoconf scripts.
-
-     Example:
-       with_Feature true "shared" "foo"
-       => "--with-shared=foo"
-       with_Feature false "shared" (throw "ignored")
-       => "--without-shared"
-  */
-  withFeatureAs = with_: feat: value: withFeature with_ feat + optionalString with_ "=${value}";
-
-  /* Create a fixed width string with additional prefix to match
-     required width.
-
-     This function will fail if the input string is longer than the
-     requested length.
-
-     Type: fixedWidthString :: int -> string -> string
-
-     Example:
-       fixedWidthString 5 "0" (toString 15)
-       => "00015"
-  */
+  # Create a fixed width string with additional prefix to match
+  # required width.
  fixedWidthString = width: filler: str:
    let
      strw = lib.stringLength str;
@@ -569,91 +223,35 @@ rec {
      assert strw <= width;
      if strw == width then str else filler + fixedWidthString reqWidth filler str;

-  /* Format a number adding leading zeroes up to fixed width.

-     Example:
-       fixedWidthNumber 5 15
-       => "00015"
-  */
+  # Format a number adding leading zeroes up to fixed width.
  fixedWidthNumber = width: n: fixedWidthString width "0" (toString n);

-  /* Check whether a value can be coerced to a string */
-  isCoercibleToString = x:
-    builtins.elem (builtins.typeOf x) [ "path" "string" "null" "int" "float" "bool" ] ||
-    (builtins.isList x && lib.all isCoercibleToString x) ||
-    x ? outPath ||
-    x ? __toString;

-  /* Check whether a value is a store path.
+  # Check whether a value is a store path.
+  isStorePath = x: builtins.substring 0 1 (toString x) == "/" && dirOf (builtins.toPath x) == builtins.storeDir;

-     Example:
-       isStorePath "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/bin/python"
-       => false
-       isStorePath "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/"
-       => true
-       isStorePath pkgs.python
-       => true
-       isStorePath [] || isStorePath 42 || isStorePath {} || …
-       => false
-  */
-  isStorePath = x:
-       isCoercibleToString x
-    && builtins.substring 0 1 (toString x) == "/"
-    && dirOf (builtins.toPath x) == builtins.storeDir;
-
-  /* Parse a string string as an int.
-
-     Type: string -> int
-
-     Example:
-       toInt "1337"
-       => 1337
-       toInt "-4"
-       => -4
-       toInt "3.14"
-       => error: floating point JSON numbers are not supported
-  */
-  # Obviously, it is a bit hacky to use fromJSON this way.
+  # Convert string to int
+  # Obviously, it is a bit hacky to use fromJSON that way.
  toInt = str:
    let may_be_int = builtins.fromJSON str; in
    if builtins.isInt may_be_int
    then may_be_int
    else throw "Could not convert ${str} to int.";

-  /* Read a list of paths from `file`, relative to the `rootPath`.
-     Lines beginning with `#` are treated as comments and ignored.
-     Whitespace is significant.
-
-     NOTE: This function is not performant and should be avoided.
-
-     Example:
-       readPathsFromFile /prefix
-         ./pkgs/development/libraries/qt-5/5.4/qtbase/series
-       => [ "/prefix/dlopen-resolv.patch" "/prefix/tzdir.patch"
-            "/prefix/dlopen-libXcursor.patch" "/prefix/dlopen-openssl.patch"
-            "/prefix/dlopen-dbus.patch" "/prefix/xdg-config-dirs.patch"
-            "/prefix/nix-profiles-library-paths.patch"
-            "/prefix/compose-search-path.patch" ]
-  */
+  # Read a list of paths from `file', relative to the `rootPath'. Lines
+  # beginning with `#' are treated as comments and ignored. Whitespace
+  # is significant.
  readPathsFromFile = rootPath: file:
    let
      root = toString rootPath;
-      lines = lib.splitString "\n" (builtins.readFile file);
-      removeComments = lib.filter (line: line != "" && !(lib.hasPrefix "#" line));
+      lines =
+        builtins.map (lib.removeSuffix "\n")
+        (lib.splitString "\n" (builtins.readFile file));
+      removeComments = lib.filter (line: !(lib.hasPrefix "#" line));
      relativePaths = removeComments lines;
      absolutePaths = builtins.map (path: builtins.toPath (root + "/" + path)) relativePaths;
    in
      absolutePaths;

-  /* Read the contents of a file removing the trailing \n
-
-     Type: fileContents :: path -> string
-
-     Example:
-       $ echo "1.0" > ./version
-
-       fileContents ./version
-       => "1.0"
-  */
-  fileContents = file: removeSuffix "\n" (builtins.readFile file);
 }
--- a/lib/systems.nix
+++ b/lib/systems.nix
@@ -0,0 +1,126 @@
+# Define the list of system with their properties.  Only systems tested for
+# Nixpkgs are listed below
+
+with import ./lists.nix;
+with import ./types.nix;
+with import ./attrsets.nix;
+
+let
+  lib = import ./default.nix;
+  setTypes = type:
+    mapAttrs (name: value:
+      setType type ({inherit name;} // value)
+    );
+in
+
+rec {
+
+  isSignificantByte = isType "significant-byte";
+  significantBytes = setTypes "significant-byte" {
+    bigEndian = {};
+    littleEndian = {};
+  };
+
+
+  isCpuType = x: isType "cpu-type" x
+    && elem x.bits [8 16 32 64 128]
+    && (8 < x.bits -> isSignificantByte x.significantByte);
+
+  cpuTypes = with significantBytes;
+    setTypes "cpu-type" {
+      arm =      { bits = 32; significantByte = littleEndian; };
+      armv5tel = { bits = 32; significantByte = littleEndian; };
+      armv7l   = { bits = 32; significantByte = littleEndian; };
+      i686 =     { bits = 32; significantByte = littleEndian; };
+      powerpc =  { bits = 32; significantByte = bigEndian; };
+      x86_64 =   { bits = 64; significantByte = littleEndian; };
+    };
+
+
+  isExecFormat = isType "exec-format";
+  execFormats = setTypes "exec-format" {
+    aout = {}; # a.out
+    elf = {};
+    macho = {};
+    pe = {};
+    unknow = {};
+  };
+
+
+  isKernel = isType "kernel";
+  kernels = with execFormats;
+    setTypes "kernel" {
+      cygwin =  { execFormat = pe; };
+      darwin =  { execFormat = macho; };
+      freebsd = { execFormat = elf; };
+      linux =   { execFormat = elf; };
+      netbsd =  { execFormat = elf; };
+      none =    { execFormat = unknow; };
+      openbsd = { execFormat = elf; };
+      win32 =   { execFormat = pe; };
+    };
+
+
+  isArchitecture = isType "architecture";
+  architectures = setTypes "architecture" {
+    apple = {};
+    pc = {};
+    unknow = {};
+  };
+
+
+  isSystem = x: isType "system" x
+    && isCpuType x.cpu
+    && isArchitecture x.arch
+    && isKernel x.kernel;
+
+  mkSystem = {
+    cpu ? cpuTypes.i686,
+    arch ? architectures.pc,
+    kernel ? kernels.linux,
+    name ? "${cpu.name}-${arch.name}-${kernel.name}"
+  }: setType "system" {
+    inherit name cpu arch kernel;
+  };
+
+
+  is64Bit = matchAttrs { cpu = { bits = 64; }; };
+  isDarwin = matchAttrs { kernel = kernels.darwin; };
+  isi686 = matchAttrs { cpu = cpuTypes.i686; };
+  isLinux = matchAttrs { kernel = kernels.linux; };
+
+
+  # This should revert the job done by config.guess from the gcc compiler.
+  mkSystemFromString = s: let
+    l = lib.splitString "-" s;
+
+    getCpu = name:
+      attrByPath [name] (throw "Unknow cpuType `${name}'.")
+        cpuTypes;
+    getArch = name:
+      attrByPath [name] (throw "Unknow architecture `${name}'.")
+        architectures;
+    getKernel = name:
+      attrByPath [name] (throw "Unknow kernel `${name}'.")
+        kernels;
+
+    system =
+      if builtins.length l == 2 then
+        mkSystem rec {
+          name = s;
+          cpu = getCpu (head l);
+          arch =
+            if isDarwin system
+            then architectures.apple
+            else architectures.pc;
+          kernel = getKernel (head (tail l));
+        }
+      else
+        mkSystem {
+          name = s;
+          cpu = getCpu (head l);
+          arch = getArch (head (tail l));
+          kernel = getKernel (head (tail (tail l)));
+        };
+  in assert isSystem system; system;
+}
--- a/lib/systems/default.nix
+++ b/lib/systems/default.nix
@@ -1,60 +0,0 @@
-{ lib }:
-  let inherit (lib.attrsets) mapAttrs; in
-
-rec {
-  doubles = import ./doubles.nix { inherit lib; };
-  forMeta = import ./for-meta.nix { inherit lib; };
-  parse = import ./parse.nix { inherit lib; };
-  inspect = import ./inspect.nix { inherit lib; };
-  platforms = import ./platforms.nix { inherit lib; };
-  examples = import ./examples.nix { inherit lib; };
-
-  # Elaborate a `localSystem` or `crossSystem` so that it contains everything
-  # necessary.
-  #
-  # `parsed` is inferred from args, both because there are two options with one
-  # clearly prefered, and to prevent cycles. A simpler fixed point where the RHS
-  # always just used `final.*` would fail on both counts.
-  elaborate = args: let
-    final = {
-      # Prefer to parse `config` as it is strictly more informative.
-      parsed = parse.mkSystemFromString (if args ? config then args.config else args.system);
-      # Either of these can be losslessly-extracted from `parsed` iff parsing succeeds.
-      system = parse.doubleFromSystem final.parsed;
-      config = parse.tripleFromSystem final.parsed;
-      # Just a guess, based on `system`
-      platform = platforms.selectBySystem final.system;
-      # Derived meta-data
-      libc =
-        /**/ if final.isDarwin              then "libSystem"
-        else if final.isMinGW               then "msvcrt"
-        else if final.isMusl                then "musl"
-        else if final.isUClibc              then "uclibc"
-        else if final.isAndroid             then "bionic"
-        else if final.isLinux /* default */ then "glibc"
-        # TODO(@Ericson2314) think more about other operating systems
-        else                                     "native/impure";
-      extensions = {
-        sharedLibrary =
-          /**/ if final.isDarwin  then ".dylib"
-          else if final.isWindows then ".dll"
-          else                         ".so";
-        executable =
-          /**/ if final.isWindows then ".exe"
-          else                         "";
-      };
-      # Misc boolean options
-      useAndroidPrebuilt = false;
-      useiOSPrebuilt = false;
-    } // mapAttrs (n: v: v final.parsed) inspect.predicates
-      // args;
-  in assert final.useAndroidPrebuilt -> final.isAndroid;
-     assert lib.foldl
-       (pass: { assertion, message }:
-         if assertion final
-         then pass
-         else throw message)
-       true
-       (final.parsed.abi.assertions or []);
-    final;
-}
--- a/lib/systems/doubles.nix
+++ b/lib/systems/doubles.nix
@@ -1,48 +0,0 @@
-{ lib }:
-let
-  inherit (lib) lists;
-  inherit (lib.systems) parse;
-  inherit (lib.systems.inspect) predicates;
-  inherit (lib.attrsets) matchAttrs;
-
-  all = [
-    "aarch64-linux"
-    "armv5tel-linux" "armv6l-linux" "armv7l-linux"
-
-    "mipsel-linux"
-
-    "i686-cygwin" "i686-freebsd" "i686-linux" "i686-netbsd" "i686-openbsd"
-
-    "x86_64-cygwin" "x86_64-darwin" "x86_64-freebsd" "x86_64-linux"
-    "x86_64-netbsd" "x86_64-openbsd" "x86_64-solaris"
-  ];
-
-  allParsed = map parse.mkSystemFromString all;
-
-  filterDoubles = f: map parse.doubleFromSystem (lists.filter f allParsed);
-
-in rec {
-  inherit all;
-
-  none = [];
-
-  arm     = filterDoubles predicates.isAarch32;
-  aarch64 = filterDoubles predicates.isAarch64;
-  x86     = filterDoubles predicates.isx86;
-  i686    = filterDoubles predicates.isi686;
-  x86_64  = filterDoubles predicates.isx86_64;
-  mips    = filterDoubles predicates.isMips;
-
-  cygwin  = filterDoubles predicates.isCygwin;
-  darwin  = filterDoubles predicates.isDarwin;
-  freebsd = filterDoubles predicates.isFreeBSD;
-  # Should be better, but MinGW is unclear.
-  gnu     = filterDoubles (matchAttrs { kernel = parse.kernels.linux; abi = parse.abis.gnu; });
-  illumos = filterDoubles predicates.isSunOS;
-  linux   = filterDoubles predicates.isLinux;
-  netbsd  = filterDoubles predicates.isNetBSD;
-  openbsd = filterDoubles predicates.isOpenBSD;
-  unix    = filterDoubles predicates.isUnix;
-
-  mesaPlatforms = ["i686-linux" "x86_64-linux" "x86_64-darwin" "armv5tel-linux" "armv6l-linux" "armv7l-linux" "aarch64-linux" "powerpc64le-linux"];
-}
--- a/lib/systems/examples.nix
+++ b/lib/systems/examples.nix
@@ -1,165 +0,0 @@
-# These can be passed to nixpkgs as either the `localSystem` or
-# `crossSystem`. They are put here for user convenience, but also used by cross
-# tests and linux cross stdenv building, so handle with care!
-{ lib }:
-let platforms = import ./platforms.nix { inherit lib; }; in
-
-rec {
-  #
-  # Linux
-  #
-  powernv = {
-    config = "powerpc64le-unknown-linux-gnu";
-    platform = platforms.powernv;
-  };
-  musl-power = {
-    config = "powerpc64le-unknown-linux-musl";
-    platform = platforms.powernv;
-  };
-
-  sheevaplug = rec {
-    config = "armv5tel-unknown-linux-gnueabi";
-    platform = platforms.sheevaplug;
-  };
-
-  raspberryPi = rec {
-    config = "armv6l-unknown-linux-gnueabihf";
-    platform = platforms.raspberrypi;
-  };
-
-  armv7l-hf-multiplatform = rec {
-    config = "armv7a-unknown-linux-gnueabihf";
-    platform = platforms.armv7l-hf-multiplatform;
-  };
-
-  aarch64-multiplatform = rec {
-    config = "aarch64-unknown-linux-gnu";
-    platform = platforms.aarch64-multiplatform;
-  };
-
-  armv5te-android-prebuilt = rec {
-    config = "armv5tel-unknown-linux-androideabi";
-    sdkVer = "21";
-    ndkVer = "10e";
-    platform = platforms.armv5te-android;
-    useAndroidPrebuilt = true;
-  };
-
-  armv7a-android-prebuilt = rec {
-    config = "armv7a-unknown-linux-androideabi";
-    sdkVer = "24";
-    ndkVer = "17c";
-    platform = platforms.armv7a-android;
-    useAndroidPrebuilt = true;
-  };
-
-  aarch64-android-prebuilt = rec {
-    config = "aarch64-unknown-linux-android";
-    sdkVer = "24";
-    ndkVer = "17c";
-    platform = platforms.aarch64-multiplatform;
-    useAndroidPrebuilt = true;
-  };
-
-  scaleway-c1 = armv7l-hf-multiplatform // rec {
-    platform = platforms.scaleway-c1;
-    inherit (platform.gcc) fpu;
-  };
-
-  pogoplug4 = rec {
-    config = "armv5tel-unknown-linux-gnueabi";
-    platform = platforms.pogoplug4;
-  };
-
-  ben-nanonote = rec {
-    config = "mipsel-unknown-linux-uclibc";
-    platform = platforms.ben_nanonote;
-  };
-
-  fuloongminipc = rec {
-    config = "mipsel-unknown-linux-gnu";
-    platform = platforms.fuloong2f_n32;
-  };
-
-  muslpi = raspberryPi // {
-    config = "armv6l-unknown-linux-musleabihf";
-  };
-
-  aarch64-multiplatform-musl = aarch64-multiplatform // {
-    config = "aarch64-unknown-linux-musl";
-  };
-
-  musl64 = { config = "x86_64-unknown-linux-musl"; };
-  musl32  = { config = "i686-unknown-linux-musl"; };
-
-  riscv = bits: {
-    config = "riscv${bits}-unknown-linux-gnu";
-    platform = platforms.riscv-multiplatform bits;
-  };
-  riscv64 = riscv "64";
-  riscv32 = riscv "32";
-
-
-  #
-  # Darwin
-  #
-
-  iphone64 = {
-    config = "aarch64-apple-ios";
-    # config = "aarch64-apple-darwin14";
-    sdkVer = "10.2";
-    xcodeVer = "8.2";
-    xcodePlatform = "iPhoneOS";
-    useiOSPrebuilt = true;
-    platform = {};
-  };
-
-  iphone32 = {
-    config = "armv7a-apple-ios";
-    # config = "arm-apple-darwin10";
-    sdkVer = "10.2";
-    xcodeVer = "8.2";
-    xcodePlatform = "iPhoneOS";
-    useiOSPrebuilt = true;
-    platform = {};
-  };
-
-  iphone64-simulator = {
-    config = "x86_64-apple-ios";
-    # config = "x86_64-apple-darwin14";
-    sdkVer = "10.2";
-    xcodeVer = "8.2";
-    xcodePlatform = "iPhoneSimulator";
-    useiOSPrebuilt = true;
-    platform = {};
-  };
-
-  iphone32-simulator = {
-    config = "i686-apple-ios";
-    # config = "i386-apple-darwin11";
-    sdkVer = "10.2";
-    xcodeVer = "8.2";
-    xcodePlatform = "iPhoneSimulator";
-    useiOSPrebuilt = true;
-    platform = {};
-  };
-
-  #
-  # Windows
-  #
-
-  # 32 bit mingw-w64
-  mingw32 = {
-    config = "i686-pc-mingw32";
-    libc = "msvcrt"; # This distinguishes the mingw (non posix) toolchain
-    platform = {};
-  };
-
-  # 64 bit mingw-w64
-  mingwW64 = {
-    # That's the triplet they use in the mingw-w64 docs.
-    config = "x86_64-pc-mingw32";
-    libc = "msvcrt"; # This distinguishes the mingw (non posix) toolchain
-    platform = {};
-  };
-}
--- a/lib/systems/for-meta.nix
+++ b/lib/systems/for-meta.nix
@@ -1,37 +0,0 @@
-{ lib }:
-let
-  inherit (lib.systems) parse;
-  inherit (lib.systems.inspect) patterns;
-
-  abis = lib.mapAttrs (_: abi: builtins.removeAttrs abi [ "assertions" ]) parse.abis;
-
-in rec {
-  all     = [ {} ]; # `{}` matches anything
-  none    = [];
-
-  arm     = [ patterns.isAarch32 ];
-  aarch64 = [ patterns.isAarch64 ];
-  x86     = [ patterns.isx86 ];
-  i686    = [ patterns.isi686 ];
-  x86_64  = [ patterns.isx86_64 ];
-  mips    = [ patterns.isMips ];
-  riscv   = [ patterns.isRiscV ];
-
-  cygwin  = [ patterns.isCygwin ];
-  darwin  = [ patterns.isDarwin ];
-  freebsd = [ patterns.isFreeBSD ];
-  # Should be better, but MinGW is unclear.
-  gnu     = [
-    { kernel = parse.kernels.linux; abi = abis.gnu; }
-    { kernel = parse.kernels.linux; abi = abis.gnueabi; }
-    { kernel = parse.kernels.linux; abi = abis.gnueabihf; }
-  ];
-  illumos = [ patterns.isSunOS ];
-  linux   = [ patterns.isLinux ];
-  netbsd  = [ patterns.isNetBSD ];
-  openbsd = [ patterns.isOpenBSD ];
-  unix    = patterns.isUnix; # Actually a list
-  windows = [ patterns.isWindows ];
-
-  inherit (lib.systems.doubles) mesaPlatforms;
-}
--- a/lib/systems/inspect.nix
+++ b/lib/systems/inspect.nix
@@ -1,59 +0,0 @@
-{ lib }:
-with import ./parse.nix { inherit lib; };
-with lib.attrsets;
-with lib.lists;
-
-let abis_ = abis; in
-let abis = lib.mapAttrs (_: abi: builtins.removeAttrs abi [ "assertions" ]) abis_; in
-
-rec {
-  patterns = rec {
-    isi686         = { cpu = cpuTypes.i686; };
-    isx86_64       = { cpu = cpuTypes.x86_64; };
-    isPowerPC      = { cpu = cpuTypes.powerpc; };
-    isPower = { cpu = { family = "power"; }; };
-    isx86          = { cpu = { family = "x86"; }; };
-    isAarch32      = { cpu = { family = "arm"; bits = 32; }; };
-    isAarch64      = { cpu = { family = "arm"; bits = 64; }; };
-    isMips         = { cpu = { family = "mips"; }; };
-    isRiscV        = { cpu = { family = "riscv"; }; };
-    isSparc        = { cpu = { family = "sparc"; }; };
-    isWasm         = { cpu = { family = "wasm"; }; };
-
-    is32bit        = { cpu = { bits = 32; }; };
-    is64bit        = { cpu = { bits = 64; }; };
-    isBigEndian    = { cpu = { significantByte = significantBytes.bigEndian; }; };
-    isLittleEndian = { cpu = { significantByte = significantBytes.littleEndian; }; };
-
-    isBSD          = { kernel = { families = { inherit (kernelFamilies) bsd; }; }; };
-    isDarwin       = { kernel = { families = { inherit (kernelFamilies) darwin; }; }; };
-    isUnix         = [ isBSD isDarwin isLinux isSunOS isCygwin ];
-
-    isMacOS        = { kernel = kernels.macos; };
-    isiOS          = { kernel = kernels.ios; };
-    isLinux        = { kernel = kernels.linux; };
-    isSunOS        = { kernel = kernels.solaris; };
-    isFreeBSD      = { kernel = kernels.freebsd; };
-    isNetBSD       = { kernel = kernels.netbsd; };
-    isOpenBSD      = { kernel = kernels.openbsd; };
-    isWindows      = { kernel = kernels.windows; };
-    isCygwin       = { kernel = kernels.windows; abi = abis.cygnus; };
-    isMinGW        = { kernel = kernels.windows; abi = abis.gnu; };
-
-    isAndroid      = [ { abi = abis.android; } { abi = abis.androideabi; } ];
-    isMusl         = with abis; map (a: { abi = a; }) [ musl musleabi musleabihf ];
-    isUClibc       = with abis; map (a: { abi = a; }) [ uclibc uclibceabi uclibceabihf ];
-
-    isEfi          = map (family: { cpu.family = family; })
-                       [ "x86" "arm" "aarch64" ];
-
-    # Deprecated after 18.03
-    isArm = isAarch32;
-  };
-
-  matchAnyAttrs = patterns:
-    if builtins.isList patterns then attrs: any (pattern: matchAttrs pattern attrs) patterns
-    else matchAttrs patterns;
-
-  predicates = mapAttrs (_: matchAnyAttrs) patterns;
-}
--- a/lib/systems/parse.nix
+++ b/lib/systems/parse.nix
@@ -1,327 +0,0 @@
-# Define the list of system with their properties.
-#
-# See https://clang.llvm.org/docs/CrossCompilation.html and
-# http://llvm.org/docs/doxygen/html/Triple_8cpp_source.html especially
-# Triple::normalize. Parsing should essentially act as a more conservative
-# version of that last function.
-#
-# Most of the types below come in "open" and "closed" pairs. The open ones
-# specify what information we need to know about systems in general, and the
-# closed ones are sub-types representing the whitelist of systems we support in
-# practice.
-#
-# Code in the remainder of nixpkgs shouldn't rely on the closed ones in
-# e.g. exhaustive cases. Its more a sanity check to make sure nobody defines
-# systems that overlap with existing ones and won't notice something amiss.
-#
-{ lib }:
-with lib.lists;
-with lib.types;
-with lib.attrsets;
-with lib.strings;
-with (import ./inspect.nix { inherit lib; }).predicates;
-
-let
-  inherit (lib.options) mergeOneOption;
-
-  setTypes = type:
-    mapAttrs (name: value:
-      assert type.check value;
-      setType type.name ({ inherit name; } // value));
-
-in
-
-rec {
-
-  ################################################################################
-
-  types.openSignificantByte = mkOptionType {
-    name = "significant-byte";
-    description = "Endianness";
-    merge = mergeOneOption;
-  };
-
-  types.significantByte = enum (attrValues significantBytes);
-
-  significantBytes = setTypes types.openSignificantByte {
-    bigEndian = {};
-    littleEndian = {};
-  };
-
-  ################################################################################
-
-  # Reasonable power of 2
-  types.bitWidth = enum [ 8 16 32 64 128 ];
-
-  ################################################################################
-
-  types.openCpuType = mkOptionType {
-    name = "cpu-type";
-    description = "instruction set architecture name and information";
-    merge = mergeOneOption;
-    check = x: types.bitWidth.check x.bits
-      && (if 8 < x.bits
-          then types.significantByte.check x.significantByte
-          else !(x ? significantByte));
-  };
-
-  types.cpuType = enum (attrValues cpuTypes);
-
-  cpuTypes = with significantBytes; setTypes types.openCpuType {
-    arm      = { bits = 32; significantByte = littleEndian; family = "arm"; };
-    armv5tel = { bits = 32; significantByte = littleEndian; family = "arm"; version = "5"; };
-    armv6m   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "6"; };
-    armv6l   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "6"; };
-    armv7a   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
-    armv7r   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
-    armv7m   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
-    armv7l   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
-    armv8a   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
-    armv8r   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
-    armv8m   = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
-    aarch64  = { bits = 64; significantByte = littleEndian; family = "arm"; version = "8"; };
-
-    i686     = { bits = 32; significantByte = littleEndian; family = "x86"; };
-    x86_64   = { bits = 64; significantByte = littleEndian; family = "x86"; };
-
-    mips     = { bits = 32; significantByte = bigEndian;    family = "mips"; };
-    mipsel   = { bits = 32; significantByte = littleEndian; family = "mips"; };
-    mips64   = { bits = 64; significantByte = bigEndian;    family = "mips"; };
-    mips64el = { bits = 64; significantByte = littleEndian; family = "mips"; };
-
-    powerpc  = { bits = 32; significantByte = bigEndian;    family = "power"; };
-    powerpc64 = { bits = 64; significantByte = bigEndian; family = "power"; };
-    powerpc64le = { bits = 64; significantByte = littleEndian; family = "power"; };
-
-    riscv32  = { bits = 32; significantByte = littleEndian; family = "riscv"; };
-    riscv64  = { bits = 64; significantByte = littleEndian; family = "riscv"; };
-
-    sparc    = { bits = 32; significantByte = bigEndian;    family = "sparc"; };
-    sparc64  = { bits = 64; significantByte = bigEndian;    family = "sparc"; };
-
-    wasm32   = { bits = 32; significantByte = littleEndian; family = "wasm"; };
-    wasm64   = { bits = 64; significantByte = littleEndian; family = "wasm"; };
-  };
-
-  ################################################################################
-
-  types.openVendor = mkOptionType {
-    name = "vendor";
-    description = "vendor for the platform";
-    merge = mergeOneOption;
-  };
-
-  types.vendor = enum (attrValues vendors);
-
-  vendors = setTypes types.openVendor {
-    apple = {};
-    pc = {};
-
-    unknown = {};
-  };
-
-  ################################################################################
-
-  types.openExecFormat = mkOptionType {
-    name = "exec-format";
-    description = "executable container used by the kernel";
-    merge = mergeOneOption;
-  };
-
-  types.execFormat = enum (attrValues execFormats);
-
-  execFormats = setTypes types.openExecFormat {
-    aout = {}; # a.out
-    elf = {};
-    macho = {};
-    pe = {};
-
-    unknown = {};
-  };
-
-  ################################################################################
-
-  types.openKernelFamily = mkOptionType {
-    name = "exec-format";
-    description = "executable container used by the kernel";
-    merge = mergeOneOption;
-  };
-
-  types.kernelFamily = enum (attrValues kernelFamilies);
-
-  kernelFamilies = setTypes types.openKernelFamily {
-    bsd = {};
-    darwin = {};
-  };
-
-  ################################################################################
-
-  types.openKernel = mkOptionType {
-    name = "kernel";
-    description = "kernel name and information";
-    merge = mergeOneOption;
-    check = x: types.execFormat.check x.execFormat
-        && all types.kernelFamily.check (attrValues x.families);
-  };
-
-  types.kernel = enum (attrValues kernels);
-
-  kernels = with execFormats; with kernelFamilies; setTypes types.openKernel {
-    # TODO(@Ericson2314): Don't want to mass-rebuild yet to keeping 'darwin' as
-    # the nnormalized name for macOS.
-    macos   = { execFormat = macho;   families = { inherit darwin; }; name = "darwin"; };
-    ios     = { execFormat = macho;   families = { inherit darwin; }; };
-    freebsd = { execFormat = elf;     families = { inherit bsd; }; };
-    linux   = { execFormat = elf;     families = { }; };
-    netbsd  = { execFormat = elf;     families = { inherit bsd; }; };
-    none    = { execFormat = unknown; families = { }; };
-    openbsd = { execFormat = elf;     families = { inherit bsd; }; };
-    solaris = { execFormat = elf;     families = { }; };
-    windows = { execFormat = pe;      families = { }; };
-  } // { # aliases
-    # 'darwin' is the kernel for all of them. We choose macOS by default.
-    darwin = kernels.macos;
-    watchos = kernels.ios;
-    tvos = kernels.ios;
-    win32 = kernels.windows;
-  };
-
-  ################################################################################
-
-  types.openAbi = mkOptionType {
-    name = "abi";
-    description = "binary interface for compiled code and syscalls";
-    merge = mergeOneOption;
-  };
-
-  types.abi = enum (attrValues abis);
-
-  abis = setTypes types.openAbi {
-    cygnus       = {};
-    msvc         = {};
-    eabi         = {};
-
-    androideabi  = {};
-    android      = {
-      assertions = [
-        { assertion = platform: !platform.isAarch32;
-          message = ''
-            The "android" ABI is not for 32-bit ARM. Use "androideabi" instead.
-          '';
-        }
-      ];
-    };
-
-    gnueabi      = { float = "soft"; };
-    gnueabihf    = { float = "hard"; };
-    gnu          = {
-      assertions = [
-        { assertion = platform: !platform.isAarch32;
-          message = ''
-            The "gnu" ABI is ambiguous on 32-bit ARM. Use "gnueabi" or "gnueabihf" instead.
-          '';
-        }
-      ];
-    };
-
-    musleabi     = { float = "soft"; };
-    musleabihf   = { float = "hard"; };
-    musl         = {};
-
-    uclibceabihf = { float = "soft"; };
-    uclibceabi   = { float = "hard"; };
-    uclibc       = {};
-
-    unknown = {};
-  };
-
-  ################################################################################
-
-  types.parsedPlatform = mkOptionType {
-    name = "system";
-    description = "fully parsed representation of llvm- or nix-style platform tuple";
-    merge = mergeOneOption;
-    check = { cpu, vendor, kernel, abi }:
-           types.cpuType.check cpu
-        && types.vendor.check vendor
-        && types.kernel.check kernel
-        && types.abi.check abi;
-  };
-
-  isSystem = isType "system";
-
-  mkSystem = components:
-    assert types.parsedPlatform.check components;
-    setType "system" components;
-
-  mkSkeletonFromList = l: {
-    "2" = # We only do 2-part hacks for things Nix already supports
-      if elemAt l 1 == "cygwin"
-        then { cpu = elemAt l 0;                      kernel = "windows";  abi = "cygnus";   }
-      else   { cpu = elemAt l 0;                      kernel = elemAt l 1;                   };
-    "3" = # Awkwards hacks, beware!
-      if elemAt l 1 == "apple"
-        then { cpu = elemAt l 0; vendor = "apple";    kernel = elemAt l 2;                   }
-      else if (elemAt l 1 == "linux") || (elemAt l 2 == "gnu")
-        then { cpu = elemAt l 0;                      kernel = elemAt l 1; abi = elemAt l 2; }
-      else if (elemAt l 2 == "mingw32") # autotools breaks on -gnu for window
-        then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "windows";  abi = "gnu"; }
-      else if hasPrefix "netbsd" (elemAt l 2)
-        then { cpu = elemAt l 0; vendor = elemAt l 1;    kernel = elemAt l 2;                }
-      else throw "Target specification with 3 components is ambiguous";
-    "4" =    { cpu = elemAt l 0; vendor = elemAt l 1; kernel = elemAt l 2; abi = elemAt l 3; };
-  }.${toString (length l)}
-    or (throw "system string has invalid number of hyphen-separated components");
-
-  # This should revert the job done by config.guess from the gcc compiler.
-  mkSystemFromSkeleton = { cpu
-                         , # Optional, but fallback too complex for here.
-                           # Inferred below instead.
-                           vendor ? assert false; null
-                         , kernel
-                         , # Also inferred below
-                           abi    ? assert false; null
-                         } @ args: let
-    getCpu    = name: cpuTypes.${name} or (throw "Unknown CPU type: ${name}");
-    getVendor = name:  vendors.${name} or (throw "Unknown vendor: ${name}");
-    getKernel = name:  kernels.${name} or (throw "Unknown kernel: ${name}");
-    getAbi    = name:     abis.${name} or (throw "Unknown ABI: ${name}");
-
-    parsed = rec {
-      cpu = getCpu args.cpu;
-      vendor =
-        /**/ if args ? vendor    then getVendor args.vendor
-        else if isDarwin  parsed then vendors.apple
-        else if isWindows parsed then vendors.pc
-        else                     vendors.unknown;
-      kernel = if hasPrefix "darwin" args.kernel      then getKernel "darwin"
-               else if hasPrefix "netbsd" args.kernel then getKernel "netbsd"
-               else                                   getKernel args.kernel;
-      abi =
-        /**/ if args ? abi       then getAbi args.abi
-        else if isLinux   parsed then
-          if isAarch32 parsed then
-            if lib.versionAtLeast (parsed.cpu.version or "0") "6"
-            then abis.gnueabihf
-            else abis.gnueabi
-          else abis.gnu
-        else if isWindows parsed then abis.gnu
-        else                     abis.unknown;
-    };
-
-  in mkSystem parsed;
-
-  mkSystemFromString = s: mkSystemFromSkeleton (mkSkeletonFromList (lib.splitString "-" s));
-
-  doubleFromSystem = { cpu, vendor, kernel, abi, ... }:
-    /**/ if abi == abis.cygnus       then "${cpu.name}-cygwin"
-    else if kernel.families ? darwin then "${cpu.name}-darwin"
-    else "${cpu.name}-${kernel.name}";
-
-  tripleFromSystem = { cpu, vendor, kernel, abi, ... } @ sys: assert isSystem sys; let
-    optAbi = lib.optionalString (abi != abis.unknown) "-${abi.name}";
-  in "${cpu.name}-${vendor.name}-${kernel.name}${optAbi}";
-
-  ################################################################################
-
-}
--- a/Show More
+++ b/Show More
@@ -1 +1 @@
 .09
 .03