anchor.diff:  
     ipfs = buildFromGitHub {
       version = 2;
  -    date = "2016-12-15";
  -    rev = "e2ba43c12dd7076357d5627ef02ed56bf2a55c30";
  +    date = "2016-12-17";
  +    rev = "548490f558e44d6abe7f77b29112b149ba207a9c";
       owner = "ipfs";
       repo = "go-ipfs";
  -    sha256 = "0xmq89padvxfr3nfhn934aibrzvnj8ng6fzplvc8fyrr8xibjgx9";
  -    gxSha256 = "04sfdaadyiam6rvxxscba9zcx5xf0x6v49s0qq02lywcrfywhfjj";
  +    sha256 = "0jb9c19nj69syxilz0rscxlfddvf7xs08n0fy2gihl1lx6z8m9sr";
  +    gxSha256 = "0v81xgb88yfg9855ycx3j7q9vcm6a8ggijxa54vfiszxci5vf0is";
       subPackages = [
         "cmd/ipfs"
         "cmd/ipfswatch"
  
positive.code:   };
  
    go-memdb = buildFromGitHub {
      version = 1;
      date = "2016-03-01";
      rev = "98f52f52d7a476958fa9da671354d270c50661a7";
      owner = "hashicorp";
      repo = "go-memdb";
      sha256 = "07938b1ln4x7caflhgsvaw8kikh5xcddwrc6zj0hcmzmbpfpyxai";
      propagatedBuildInputs = [
        go-immutable-radix
      ];
  
negative.code: 
    vault = buildFromGitHub {
      version = 2;
      rev = "v0.6.4";
      owner = "hashicorp";
      repo = "vault";
      sha256 = "1lpap4b6501hqsfy09piksv64g9pylsglqbqyrkp9pfr9h8hxrx8";
  
      nativeBuildInputs = [
        pkgs.protobuf-cpp
  