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-multihash = buildFromGitHub {
      version = 2;
      rev = "1f46870869d84738e7cf9120d4ac15c5e9b1c59f";
      owner  = "multiformats";
      repo   = "go-multihash";
      sha256 = "1dw7jvgj55m0kjqr13fbfjwsz92356l7g0jjl2aaml3b0cd6xrvg";
      goPackageAliases = [ "github.com/jbenet/go-multihash" ];
      propagatedBuildInputs = [
        crypto
        go-base58
      ];
      date = "2016-09-29";
    };
  
    go-multipart-files = buildFromGitHub {
  
negative.code: 
    go-multiaddr-net = buildFromGitHub {
      version = 2;
      rev = "b3ee630630aa38429dbf6e7883ea07f963623208";
      owner  = "multiformats";
      repo   = "go-multiaddr-net";
      sha256 = "04jsiyaqc300qh16xa0rhgwd8svnqv9821p0mkpr2z7fdy32z6d9";
      date = "2016-10-04";
      goPackageAliases = [ "github.com/jbenet/go-multiaddr-net" ];
      propagatedBuildInputs = [
        go-multiaddr
  