anchor.diff:      lfe
       rebar3-open
   
  -    # C
  +    # C/C++
       cc
       gcc
  +    # TODO: gperftools
   
       # Cryptography
       gnupg
  +
  +    # Database
  +    # TODO: mysql
  +    # TODO: sqlite
  +
  +    # Engraving
  +    # FIXME: frescobaldi
  +    # TODO: lilypond (add 2.19.x package)
  +    # FIXME: musescore
   
       # Git
       git
       git-crypt
       git-lfs
  +    # TODO: gitAndTools.ghi (create package)
  +    # TODO: gitAndTools.git-flow (create package)
       gitAndTools.hub
   
  -    # Graphics
  -    # FIXME: graphicsmagick # NOTE: graphviz error
  -    # FIXME: imagemagick
  -
  -    # Graphing
  +
  +    # Graphing/Statistics
       gnuplot
       # FIXME: graphviz # NOTE: ApplicationServices ld error
  +    # FIXME: R
   
       # Haskell
       cabal-install
  
positive.code:     leiningen
      openjdk8
  
      # Lisp
      sbcl
  
      # Nix
      nixops
  
negative.code: 
    nixpkgs.config.packageOverrides = pkgs: {
      erlang = pkgs.erlangR19;
      # TODO: mysql = mysql57;
    };
  }
  