{ lib, stdenv, hextra, hugo, buildProxy ? null }: stdenv.mkDerivation
{
  name = "blog";
  src = ./.;
  nativeBuildInputs = [ hugo ];
  preBuild = lib.optionalString (buildProxy != null) ''source ${buildProxy}'';
  configurePhase =
  ''
    mkdir themes
    ln -s ${hextra} themes/hextra
  '';
  buildPhase =
  ''
    runHook preBuild
    hugo
    runHook postBuild
  '';
  installPhase = "cp -r public $out";
}