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:   environment.shellAliases.ll = "ls -Glh";
    environment.shellAliases.ls = "ls -G";
  
    nix.nixPath = [ # Use local nixpkgs checkout instead of channels.
      "darwin=$HOME/.nix-defexpr/darwin"
      "darwin-config=$HOME/.nixpkgs/darwin-configuration.nix"
  
negative.code:     autojump
      awscli
      coreutils
      # TODO: csvprintf (create package)
      # TODO: fswatch # FIXME: update to 1.9.3
      gawk
      gnumake
      gnused
  