anchor.diff:      buildInputs = [ pkgconfig libusb ];
     };
   
  +  vulcand = buildGoPackage rec {
  +    rev = "v0.8.0-beta.3";
  +    name = "vulcand-${rev}";
  +    goPackagePath = "github.com/mailgun/vulcand";
  +    preBuild = "export GOPATH=$GOPATH:$NIX_BUILD_TOP/go/src/${goPackagePath}/Godeps/_workspace";
  +    src = fetchFromGitHub {
  +      inherit rev;
  +      owner = "mailgun";
  +      repo = "vulcand";
  +      sha256 = "08mal9prwlsav63r972q344zpwqfql6qw6v4ixbn1h3h32kk3ic6";
  +    };
  +    subPackages = [ "./" ];
  +  };
  +
     websocket = buildGoPackage rec {
       rev = "f4076986b69612ecb8bc7ce06d742eda6286200d";
       name = "websocket-${stdenv.lib.strings.substring 0 7 rev}";
  
positive.code:     };
    };
  
    hologram = buildGoPackage rec {
      rev  = "2bf08f0edee49297358bd06a0c9bf44ba9051e9c";
      name = "hologram-${stdenv.lib.strings.substring 0 7 rev}";
  
negative.code:       repo = "columnize";
        sha256 = "1h3sxzhiwz65vf3cvclirlf6zhdr97v01dpn5cmf3m09rxxpnp3f";
      };
    };
  
    confd = buildGoPackage rec {
      rev = "v0.9.0";
      name = "confd-${rev}";
      goPackagePath = "github.com/kelseyhightower/confd";
      preBuild = "export GOPATH=$GOPATH:$NIX_BUILD_TOP/go/src/${goPackagePath}/Godeps/_workspace";
      src = fetchFromGitHub {
        inherit rev;
        owner = "kelseyhightower";
        repo = "confd";
        sha256 = "0rz533575hdcln8ciqaz79wbnga3czj243g7fz8869db6sa7jwlr";
      };
      subPackages = [ "./" ];
    };
  
    dbus = buildGoPackage rec {
  