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: 
    utp = buildFromGitHub {
      version = 2;
      rev = "83bf7c81b0e1f917f18ac31b7a27b91c33737df9";
      owner  = "anacrolix";
      repo   = "utp";
      sha256 = "0zprk0nv0b79ld4cp0zxxqmxzfvrgixr5ifm98wrdymp795rplzf";
      date = "2016-10-06";
      propagatedBuildInputs = [
        envpprof
        missinggo
  
negative.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2016-11-21";
      rev = "9094cc8f4297b9365a3d3260f839724b135094d0";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "1dn9ff04rl0lzdlzg4wzl1c8qfwyjr1pw5p26cm3abvabgg0b49r";
      gxSha256 = "1zn9zdpqgp80gvk5xsiiikqjsks93vxsdzqzk9dk9kqgps61pz8p";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  