anchor.diff:      haskellngPackages.cabal-install
       # android development
       androidsdk_4_4
  -    android-udev-rules
  +    HEAD.android-udev-rules
   
       # Programming libraries
       glfw
  
positive.code: { config, pkgs, ... }:
  {
    # List packages installed in system profile. To search by name, run:
    # $ nix-env -qaP | grep wget
  
negative.code:     cmus
      evince
      pidgin
      HEAD.texLiveFull
    ];
  
    # Fonts
  