anchor.diff:      repo = "jwt-go";
       rev = "v3.0.0";
       sha256 = "0llmcxijl24gz6w75il6rnijc9gzda4byl5kwr4qnzpw9j0q87n9";
  -  };
  -
  -  jwt-go_v2 = buildFromGitHub {
  -    version = 2;
  -    owner = "dgrijalva";
  -    repo = "jwt-go";
  -    rev = "v2.7.0";
  -    sha256 = "bee3aac16ad7dfcf79cac6442ae4ef300698b0b3125026d34c36cd46b27060e6";
  -    meta.autoUpdate = false;
     };
   
     gravitational_kingpin = buildFromGitHub {
  
positive.code:     date = "2016-11-21";
      rev = "d7e6ca3010b6f084d8056847f55d7f572f180678";
      sha256 = "1c4gvmwkkiqyj48hvh7iga3jv3sxdp3wjwjv88qmhsgchbsl5k97";
      meta.useUnstable = true;
    };
  
  
negative.code:     date = "2016-11-25";
      rev = "9636d96501d1d89ea3827c9df770320544399422";
      sha256 = "1z6lvr4nkxyr8mhl0g3i32qlbf8fg8wcxrjyn9jmpvq82liwg056";
      buildInputs = [
        elastic_v5
        toml
        urfave_cli
        yaml_v2
      ];
    };
  
    mitchellh_cli = buildFromGitHub {
  