anchor.diff:  
     net = buildFromGitHub {
       version = 2;
  -    rev = "b1a2d6e8c8b5fc8f601ead62536f02a8e1b6217d";
  -    date = "2016-12-10";
  +    rev = "cfae461cedfdcab6e261a26eb77db53695623303";
  +    date = "2016-12-13";
       owner  = "golang";
       repo   = "net";
  -    sha256 = "0cjlvrpf3hr5y6124irbkhy978nmfdlnrddq4xprsybgwgdahd24";
  +    sha256 = "16m2x6qq31hgzx00w8v3fdlkj1nd9id7mzd7d6cfaq7lvrd15xd6";
       goPackagePath = "golang.org/x/net";
       goPackageAliases = [
         "github.com/hashicorp/go.net"
  
positive.code: 
    go-multihash = buildFromGitHub {
      version = 2;
      rev = "3922c539dc610bb88fdbb2bcd1108802bcd7ea50";
      owner  = "multiformats";
      repo   = "go-multihash";
      sha256 = "0jbpmpm5ij64j6073c133dl4c0n3bh5m3rknyakclgd9qbb031vj";
      goPackageAliases = [ "github.com/jbenet/go-multihash" ];
      propagatedBuildInputs = [
        crypto
        go-base58
      ];
      date = "2016-11-10";
    };
  
    go-multipart-files = buildFromGitHub {
  
negative.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2016-12-12";
      rev = "4cb236caa490270cc1c0b49f26396fa40cf0fefd";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "1fkg75yqi3xfvm8a92hwgx8awp3ciqjf1w9kn5zk29slqxil86dc";
      gxSha256 = "0kb16f0xgznxdq7lbhyik2rir39l5zyqh0dcic2x7fg2fd64dks6";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  