anchor.diff:      ];
     };
   
  -  gcloud-golang = buildFromGitHub {
  -    version = 2;
  -    date = "2016-10-31";
  -    rev = "2fc1b4432b57fa2dd641d443a4b88157f03b2f12";
  -    owner = "GoogleCloudPlatform";
  -    repo = "gcloud-golang";
  -    sha256 = "0kw56i92qy68c1hbdbpg6hk8q3a78d7k4zbv19vg9d3rbjjzmzaa";
  -    goPackagePath = "cloud.google.com/go";
  -    goPackageAliases = [
  -      "google.golang.org/cloud"
  -    ];
  -    propagatedBuildInputs = [
  -      net
  -      oauth2
  -      protobuf
  -      google-api-go-client
  -      grpc
  -    ];
  -    excludedPackages = "oauth2";
  -    meta.useUnstable = true;
  -  };
  -
  -  gcloud-golang-for-go4 = buildFromGitHub {
  -    inherit (gcloud-golang) rev date owner repo sha256 version goPackagePath goPackageAliases meta;
  -    subPackages = [
  -      "storage"
  -    ];
  -    propagatedBuildInputs = [
  -      gax-go
  -      google-api-go-client
  -      grpc
  -      net
  -      oauth2
  -    ];
  -  };
  -
  -  gcloud-golang-compute-metadata = buildFromGitHub {
  -    inherit (gcloud-golang) rev date owner repo sha256 version goPackagePath goPackageAliases meta;
  -    subPackages = [ "compute/metadata" "internal" ];
  -    buildInputs = [ net ];
  -  };
  -
     genproto = buildFromGitHub {
       version = 2;
       date = "2016-10-07";
  
positive.code:     goPackagePath = "go4.org";
      goPackageAliases = [ "github.com/camlistore/go4" ];
      buildInputs = [
        gcloud-golang-for-go4
        oauth2
        net
        sys
  
negative.code:       prometheus_common
        yaml_v2
      ];
    };
  
    prometheus_client_golang = buildFromGitHub {
  