anchor.diff:  
     go-ipfs-util = buildFromGitHub {
       version = 2;
  -    rev = "6a4d34b01bc6bb090a3fe06d2bc02655c4a711f6";
  +    rev = "f25fcc891281327394bb48000ef0970d11baff2b";
       owner  = "ipfs";
       repo   = "go-ipfs-util";
  -    sha256 = "1h136875xgylgwkxak4j7jzk46kvwjbwjkx79k9c5nzs69jjqz2a";
  -    date = "2017-03-24";
  +    sha256 = "0bcfrsii05cgqnx94hcy07h71l00fr0vchyqirj9096yycgyzyz4";
  +    date = "2017-03-28";
       buildInputs = [
         go-base58
         go-multihash
  
positive.code: 
    text = buildFromGitHub {
      version = 2;
      rev = "fc7fa097411d30e6708badff276c4c164425590c";
      date = "2017-03-23";
      owner = "golang";
      repo = "text";
      sha256 = "07rqx1kvqb6hy81gg2i8aj73yhpfpwm2lcnbsr709nnlwhx019lv";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
      excludedPackages = "cmd";
  
negative.code:       pkg
        ugorji_go
      ];
    };
  
    etcd_for_vault = buildFromGitHub {
      inherit (etcd) rev date owner repo sha256 version meta;
      subPackages = [
        "auth/authpb"
        "client"
  