anchor.diff:  
     urfave_cli = buildFromGitHub {
       version = 2;
  -    rev = "v1.18.1";
  +    rev = "v1.19.0";
       owner = "urfave";
       repo = "cli";
  -    sha256 = "0vcmwlb9cp7jxza78wm3g2xwdw06fd5my7b43a2pgfhy0621jwi3";
  +    sha256 = "beeb91b8c76df51ab8857d681ab6e15d036719feaf85ad3c8f1dfbf15af903e3";
  +    goPackagePath = "gopkg.in/urfave/cli.v1";
       goPackageAliases = [
         "github.com/codegangsta/cli"
  -    ];
  -    buildInputs = [
  +      "github.com/urfave/cli"
  +    ];
  +    buildInputs = [
  +      toml
         yaml_v2
       ];
     };
  
positive.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2016-11-10";
      rev = "4442498d926a25b4084affe70d15d7c8dcf9a6f8";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "0zs43397m5hdii0f68fsb8plx4519yfaqw0g53ji5w18kd5gvj25";
      gxSha256 = "1g9z9f4v9ca1lv90ibzfxj6in34ijbxdgj0x6s1xrfx346jncyxl";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  
negative.code: 
    utp = buildFromGitHub {
      version = 2;
      rev = "fa8b6bbd0386e3b98845c5d1f10148b29915d4b9";
      owner  = "anacrolix";
      repo   = "utp";
      sha256 = "1h5sbkvn8rrvhvibc0903giayvp7na2vy3xqq53kcd8d8i1n3ig8";
      date = "2016-10-26";
      propagatedBuildInputs = [
        envpprof
        missinggo
  