anchor.diff:    };
   
     oauth2 = buildFromGitHub {
  -    version = 1;
  -    rev = "c10ba270aa0bf8b8c1c986e103859c67a9103061";
  +    version = 2;
  +    rev = "3c3a985cb79f52a3190fbc056984415ca6763d01";
  +    date = "2016-08-26";
  +    owner = "golang";
  +    repo = "oauth2";
  +    sha256 = "0519swla7184nvn62bpvrvlpwxxgrmq5vdf37v92ipda31l5hvm9";
  +    goPackagePath = "golang.org/x/oauth2";
  +    goPackageAliases = [ "github.com/golang/oauth2" ];
  +    propagatedBuildInputs = [
  +      net
  +      gcloud-golang-compute-metadata
  +    ];
  +  };
  +
  +
  +  protobuf = buildFromGitHub {
  +    version = 2;
  +    rev = "1f49d83d9aa00e6ce4fc8258c71cc7786aec968a";
       date = "2016-08-24";
       owner = "golang";
  -    repo = "oauth2";
  -    sha256 = "0683g8iz4yj42ys274n5y3z0wjq3wb4kgni1s6l3vyqnh4m50lcn";
  -    goPackagePath = "golang.org/x/oauth2";
  -    goPackageAliases = [ "github.com/golang/oauth2" ];
  -    propagatedBuildInputs = [
  -      net
  -      gcloud-golang-compute-metadata
  -    ];
  -  };
  -
  -
  -  protobuf = buildFromGitHub {
  -    version = 1;
  -    rev = "888eb0692c857ec880338addf316bd662d5e630e";
  -    date = "2016-08-23";
  -    owner = "golang";
       repo = "protobuf";
  -    sha256 = "1higr6dlr987fa089333xh79999p76pavfbism8vjcmjhwwf5dk5";
  +    sha256 = "0q04is47nj8bryh548k5j52c62w4h2x2lw8rr34257xqp7i51vmc";
       goPackagePath = "github.com/golang/protobuf";
       goPackageAliases = [
         "code.google.com/p/goprotobuf"
  
positive.code:     inherit (gcloud-golang) rev date owner repo sha256 version goPackagePath goPackageAliases meta;
      subPackages = [ "compute/metadata" "internal" ];
      buildInputs = [ net ];
    };
  
    geoip2-golang = buildFromGitHub {
  
negative.code:   };
  
    gcloud-golang = buildFromGitHub {
      version = 2;
      date = "2016-09-06";
      rev = "a47b182e769f5e75f5fc927ff6ee2678f7f552cf";
      owner = "GoogleCloudPlatform";
      repo = "gcloud-golang";
      sha256 = "0n3791sfcigpaamhh9vx34wqzch3llapsr0j1f648l67qk6s68hk";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  