anchor.diff:      android-udev-rules
   
       # Programming libraries
  +    boehmgc
       glfw
       glxinfo
  -    HEAD.pcg_c
  +    pcg_c
   
       # Browsers and multimedia
       firefoxWrapper
  
positive.code:     links
      gimp
      scrot
      HEAD.texLiveFull
    ];
  
    # Fonts
  
negative.code:     gdb
      gnumake
      ruby
      bundler_HEAD
      bundix
      # For haskell development via `nix-shell`; run `sudo nix-channel --add
      # <nixpkgs-unstable>`, then do `sudo nix-channel --update`.
      # <nixpkgs-unstable> is located at
  