anchor.diff:  
     ipfs = buildFromGitHub {
       version = 2;
  -    date = "2016-09-19";
  -    rev = "e10453b67bb8e683082ebde345d0080f05aeca12";
  +    date = "2016-09-20";
  +    rev = "300187ac52325453a632313fc8bf3423c078882e";
       owner = "ipfs";
       repo = "go-ipfs";
  -    sha256 = "38f48703cf43eda32c4071ea29546d0e746064b41ab08f1037bae867cf46edc7";
  -    gxSha256 = "04ak7xgchnrxcyw1cih2xvix73j13f0zrh425l1cv2sycjdn0n9q";
  +    sha256 = "001n6fxxdnwp6lc0lqqnmmiinc2i3cv2szv62c6gvgvv73bssnj1";
  +    gxSha256 = "03h00jk4zwgxqiq5y96w93z1ls2sickmraklz7bq0ffs3aqp5j3a";
       subPackages = [
         "cmd/ipfs"
         "cmd/ipfswatch"
  
positive.code: 
    text = buildFromGitHub {
      version = 2;
      rev = "2df9074612f50810d82416d2229398a1e7188c5c";
      date = "2016-09-15";
      owner = "golang";
      repo = "text";
      sha256 = "0iw4ck14mhdll6l825nw1dp6jcbr2ccy3x3zpp2zkk433gx90iml";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
    };
  
    tools = buildFromGitHub {
  
negative.code: 
    crypto = buildFromGitHub {
      version = 2;
      rev = "8e06e8ddd9629eb88639aba897641bff8031f1d3";
      date = "2016-09-10";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "0lj7xqdggyqi0k034x242ny7rkn1ybgxvd1hnil3zis3nmidql7v";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  