localPackages.vasp: add src symlink

local/pkgs/vasp/gnu/default.nix

@@ -24,6 +24,7 @@ let vasp = stdenvNoCC.mkDerivation
     for i in std gam ncl; do
       cp bin/vasp_$i $out/bin/vasp-$i
     done
+    ln -s ${src} $out/src
   '';
 };
 in writeShellApplication

local/pkgs/vasp/intel/default.nix

@@ -41,6 +41,9 @@ let
     ''
       mkdir -p $out/bin
       for i in std gam ncl; do cp bin/vasp_$i $out/bin/vasp-$i; done
+      mkdir $out/src
+      ln -s ${src} $out/src/vasp
+      ln -s ${vtst} $out/src/vtst
     '';
     dontFixup = true;
     requiredSystemFeatures = [ "gccarch-exact-${stdenvNoCC.hostPlatform.gcc.arch}" ];

local/pkgs/vasp/nvidia/default.nix

@@ -44,6 +44,9 @@ let
     ''
       mkdir -p $out/bin
       for i in std gam ncl; do cp bin/vasp_$i $out/bin/vasp-$i; done
+      mkdir $out/src
+      ln -s ${src} $out/src/vasp
+      ln -s ${vtst} $out/src/vtst
     '';
     dontFixup = true;
     requiredSystemFeatures = [ "gccarch-exact-${stdenvNoCC.hostPlatform.gcc.arch}" ];