anchor.diff:      skim
   
       # .NET
  -    mono
  +    # mono
   
       # Nix
       # nixops
  -    nix-repl
  +    # nix-repl
   
       # OCaml
  -    ocaml
  -    camlp5
  -    opam
  +    # ocaml
  +    # camlp5
  +    # opam
   
       # Protocol Buffers
       protobuf
  
positive.code:     # C/C++
      cc
      gcc
      gperftools
  
      # Cryptography
      gnupg
  
negative.code:     sbcl
  
      # Messaging
      # zeromq
  
      # Miscellaneous
      # FIXME: calibre
  