anchor.diff:      gdb
       gnumake
       ruby
  +    HEAD.bundler_HEAD
  +    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
  
positive.code:     haskellngPackages.cabal-install
      # android development
      androidsdk_4_4
      HEAD.android-udev-rules
  
      # Programming libraries
      glfw
  
negative.code:     cmus
      evince
      pidgin
      links
      HEAD.texLiveFull
    ];
  
  