anchor.diff:      openjdk8
   
       # Libraries
  -    # TODO: openssl
  +    # libsndfile # NOTE: used by fluidsynth
  +    # openssl
   
       # Lisp/Scheme
       guile
  
positive.code:     gnupg
  
      # Database
      # TODO: mysql
      # TODO: sqlite
  
      # Document Preparation
      asciidoc
  
negative.code:   # nixpkgs.config.allowBroken = true; # HACK
  
    nixpkgs.config.packageOverrides = pkgs: {
      camlp5 = pkgs.ocamlPackages.camlp5_6_strict;
      coq = pkgs.coq_8_6;
      erlang = pkgs.erlangR19;
      gcc = pkgs.gcc6;
      mono = pkgs.mono46;
      nodejs = pkgs.nodejs-7_x;
      ocaml = pkgs.ocaml_4_03;
      # TODO: postgresql = pks.postgresql96;
      protobuf = pkgs.protobuf3_1;
      # TODO: mysql = mysql57;
    };
  