anchor.diff:  { pkgs ? import <nixpkgs> { system = "x86_64-linux"; config.allowUnfree = true; }
   , ...
   }:
  +
  +#
  +# The packages here are mostly grouped by primary programming language
  +# and sorted alphabetically within those groups.
  +#
   
   let
     inherit (pkgs)
  
positive.code:     stdenv fetchurl;
    inherit (lib) overrideDerivation;
  in rec {
    angel = pkgs.haskellPackages.callPackage ./angel {};
  
    couchbase = pkgs.callPackage ./couchbase {};
  
    damemtop = pkgs.writeScriptBin "damemtop" ''
  
negative.code:   go = pkgs.callPackage ./go/1.4.nix {};
  
    graphviz = pkgs.callPackage ./graphviz {};
  
    imagemagick = pkgs.callPackage ./ImageMagick {
      libX11 = null;
  