anchor.diff:      date = "2017-11-23";
     };
   
  +  go-ipfs-cmdkit = buildFromGitHub {
  +    version = 3;
  +    rev = "f3631e8ddde711a7aefed041806902d907a1f9ae";
  +    owner  = "ipfs";
  +    repo   = "go-ipfs-cmdkit";
  +    sha256 = "0yav7n572glmwnzahksgz98yf4zaf5lhqlbijc4i0kidkzrdgx0y";
  +    date = "2017-11-20";
  +    propagatedBuildInputs = [
  +      go-ipfs-util
  +      sys
  +    ];
  +  };
  +
     go-ipfs-util = buildFromGitHub {
       version = 3;
       rev = "ca91b45d2e776e6e066151f7b65a3984c87e9fbb";
  
positive.code:     propagatedBuildInputs = [
        go-shared
        logrus
      ];
    };
  
  
negative.code:     repo   = "go-ipfs-util";
      sha256 = "1ri1f5n5m1bdyjzigqygblim9hvf60bh49pd03819hny1wjz1660";
      date = "2017-07-10";
      propagatedBuildInputs = [
        go-base58
        go-multihash
      ];
  