anchor.diff:  
     ipfs = buildFromGitHub {
       version = 2;
  -    date = "2016-09-13";
  -    rev = "85da76a4eea9098d5874c168c728591d1d2f58a1";
  +    date = "2016-09-19";
  +    rev = "e10453b67bb8e683082ebde345d0080f05aeca12";
       owner = "ipfs";
       repo = "go-ipfs";
  -    sha256 = "aac7c76ce3be455df629b742d3feb22446cd8c4471e1db24cc5389b7f496a2f6";
  -    gxSha256 = "1fih2cinl47dd5x9mwb1igr7l26ag5la3csm3whbc3rndsxfmv2y";
  +    sha256 = "38f48703cf43eda32c4071ea29546d0e746064b41ab08f1037bae867cf46edc7";
  +    gxSha256 = "04ak7xgchnrxcyw1cih2xvix73j13f0zrh425l1cv2sycjdn0n9q";
       subPackages = [
         "cmd/ipfs"
         "cmd/ipfswatch"
  
positive.code: 
    text = buildFromGitHub {
      version = 2;
      rev = "04b8648d973c126ae60143b3e1473bc1576c7597";
      date = "2016-09-15";
      owner = "golang";
      repo = "text";
      sha256 = "01a5nxvg10rznv0knc1mim3canxjak0s26g1q940q9shzxrp3i2s";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
    };
  
negative.code: 
    go-multiaddr = buildFromGitHub {
      version = 2;
      rev = "197f65382f3b21e04b5ad4608274ec497dd49e4d";
      date = "2016-09-19";
      owner  = "multiformats";
      repo   = "go-multiaddr";
      sha256 = "15d9za3yrxhs63zdnd8d058bqws707ci2a1ryy1i1hr2jdj7dlvv";
      goPackageAliases = [ "github.com/jbenet/go-multiaddr" ];
      propagatedBuildInputs = [
        go-multihash
      ];
  