anchor.diff:  
     ipfs = buildFromGitHub {
       version = 2;
  -    date = "2016-11-29";
  -    rev = "f81cccc3fc927f592e6655fe280aa7f0c7d885c6";
  +    date = "2016-11-30";
  +    rev = "f8635ba01f99765425f949e2fc1e5688f81b17a7";
       owner = "ipfs";
       repo = "go-ipfs";
  -    sha256 = "0s4qqrwcwk58hl26qkrabqcks2nchl4qm34ysyk32lpr1jaiwdzw";
  -    gxSha256 = "19slnx7l84p1in1xys3z6pplqm5n7mzsx7xv4sd15z6fh4xnd2l3";
  +    sha256 = "0x9js2wf7bql5dw8g2svxbssrmkyp4xqi6j296dlr35p1bcvz3gr";
  +    gxSha256 = "0kr2xc54gc9zi4lb6yqndxzpiqafz5hbq3680r9jw38p2i5b383y";
       subPackages = [
         "cmd/ipfs"
         "cmd/ipfswatch"
  
positive.code: 
    crypto = buildFromGitHub {
      version = 2;
      rev = "ede567c8e044a5913dad1d1af3696d9da953104c";
      date = "2016-11-04";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "1g1dbzszpm0b09nbfxnrkr0a9v4lz9647zx4q456zdrw6qcm1lrl";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  
negative.code: 
    text = buildFromGitHub {
      version = 2;
      rev = "5c6cf4f9a2357d38515014cea8c488ed22bdab90";
      date = "2016-11-30";
      owner = "golang";
      repo = "text";
      sha256 = "0lr9jrlyvip8mh2f9y38ifkgiys72bjl75df6ifinqd5jfy07bja";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
      excludedPackages = "cmd";
  