anchor.diff:      owner  = "whyrusleeping";
       repo   = "tar-utils";
       sha256 = "0p0cmk30b22bgfv4m29nnk2359frzzgin2djhysrqznw3wjpn3nz";
  +  };
  +
  +  tb = buildFromGitHub {
  +    version = 2;
  +    owner = "tsenart";
  +    repo = "tb";
  +    rev = "19f4c3d79d2bd67d0911b2e310b999eeea4454c1";
  +    date = "2015-12-08";
  +    sha256 = "fb8fb335f10f48e641b3a6abcfe3eb20737cfb5a71aa6b6dbd3399aaedcb8fad";
     };
   
     teleport = buildFromGitHub {
  
positive.code:     sha256 = "06fbr2yjnzgqcbscg09csjvbk9zxszwvmmfib8k4vqwwvpj1iq58";
      buildInputs = [
        afero
      ];
    };
  
  
negative.code:     sha256 = "0ycjvfbvsq6pmlbq2v7670w1k25nydnz4scx0qgiv0f4llxnr0y9";
    };
  
    open-golang = buildFromGitHub {
      version = 2;
      owner = "skratchdot";
      repo = "open-golang";
      rev = "75fb7ed4208cf72d323d7d02fd1a5964a7a9073c";
      date = "2016-03-02";
      sha256 = "da900f012522dd61cc0504a16bbb137e3ed2173d0715fbf709046a1e0d923ca3";
    };
  
    openssl = buildFromGitHub {
      version = 2;
      date = "2016-09-22";
  