anchor.diff:  
     ipfs = buildFromGitHub {
       version = 2;
  -    date = "2016-10-03";
  -    rev = "c7a851bb9de4f10eaf9f90ee2c50374e225cb31e";
  +    date = "2016-10-05";
  +    rev = "67a1b3e1bfe9d05478f15068f31cc6868f12a74f";
       owner = "ipfs";
       repo = "go-ipfs";
  -    sha256 = "1swbw33bi7v8ysvndsqp41y9aybv19jj90phvnw6lv1568r10fli";
  +    sha256 = "1kvd18078hk7lll0vv54sqc3gkiqqrlziam5060w0kx1gk2l1vwk";
       gxSha256 = "189sxcj5k85q3w5b9i7064vp6cp4hg6akwi3zqzsq7d0n67cvbc4";
       subPackages = [
         "cmd/ipfs"
  
positive.code: 
    go-multiaddr = buildFromGitHub {
      version = 2;
      rev = "407d06bbd6b3dbd8f3f37d452362b97d65069ab7";
      date = "2016-09-29";
      owner  = "multiformats";
      repo   = "go-multiaddr";
      sha256 = "07ghw81kgbr92i54sjdjcw9s7x9ff54g21vz1nkdifqvyrmabbcd";
      goPackageAliases = [ "github.com/jbenet/go-multiaddr" ];
      propagatedBuildInputs = [
        go-multihash
  
negative.code: 
    gcloud-golang = buildFromGitHub {
      version = 2;
      date = "2016-10-07";
      rev = "5af4269f950e91e917bab77f1138139023c868c2";
      owner = "GoogleCloudPlatform";
      repo = "gcloud-golang";
      sha256 = "0z82ksxpyhw6k6j1vswb1x4an8hiz5w1grq1161w1gilla1p3s45";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  