anchor.diff:  
     consul_api = buildFromGitHub {
       inherit (consul) owner repo;
  -    date = "2016-07-25";
  -    rev = "a8d13d794252429e3ad8a869df0a2b2fd31cde57";
  -    sha256 = "ca63937920817a3889c5d2d67b330001cb5e51693fe0b870f3eaafedf006cd4d";
  +    date = "2016-08-17";
  +    rev = "9f2c0da85afc74f0d2bd0fad7cb134864d9aba73";
  +    sha256 = "4ef909dcc2bcb8c78ca2932e5faee7975f9257534d8f534cd748140ce59d81d8";
       propagatedBuildInputs = [
         go-cleanhttp
         serf
  
positive.code:       gettext
        gocapability
        golang-petname
        go-lxc-v2
        go-sqlite3
        go-systemd
        log15
        pkgs.lxc
        mux
        pborman_uuid
        pongo2-v3
        protobuf
        tablewriter
        tomb-v2
        yaml-v2
        websocket
      ];
    };
  
negative.code:   };
  
    beorn7_perks = buildFromGitHub rec {
      date = "2016-08-04";
      owner  = "beorn7";
      repo   = "perks";
      rev = "4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9";
      sha256 = "19dw6jcvcbnk0nq4wy9dhrb1d3k85xwnfvwn1ld03f2mzmshf9fr";
    };
  
    pflag = buildFromGitHub {
  