anchor.diff:      goPackagePath = "go4.org";
       goPackageAliases = [ "github.com/camlistore/go4" ];
       buildInputs = [
  -      gcloud-golang-for-go4
  +      google-cloud-go-for-go4
         oauth2
         net
         sys
  
positive.code:     goPackageAliases = [ "github.com/golang/oauth2" ];
      propagatedBuildInputs = [
        net
        gcloud-golang-compute-metadata
      ];
    };
  
  
negative.code:     propagatedBuildInputs = [
        goutils_logging
      ];
    };
  
    google-cloud-go = buildFromGitHub {
      version = 2;
      date = "2016-10-28";
      rev = "28994ff9b5baa92fe337dacaee126fcf80fefa3e";
      owner = "GoogleCloudPlatform";
      repo = "google-cloud-go";
      sha256 = "5a4a4c2ee67056246371b7e59eb48b8bfeb11a965afe5fbaedae1532f521314d";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
      ];
      propagatedBuildInputs = [
        net
        oauth2
        protobuf
        google-api-go-client
        grpc
      ];
      excludedPackages = "oauth2";
      meta.useUnstable = true;
    };
  
    google-cloud-go-for-go4 = buildFromGitHub {
      inherit (google-cloud-go) rev date owner repo sha256 version goPackagePath goPackageAliases meta;
      subPackages = [
        "storage"
      ];
      propagatedBuildInputs = [
        gax-go
        google-api-go-client
        grpc
        net
        oauth2
      ];
    };
  
    google-cloud-go-compute-metadata = buildFromGitHub {
      inherit (google-cloud-go) rev date owner repo sha256 version goPackagePath goPackageAliases meta;
      subPackages = [ "compute/metadata" "internal" ];
      buildInputs = [ net ];
    };
  
    gopcap = buildFromGitHub {
  