anchor.diff:  
     netlink = buildFromGitHub {
       version = 2;
  -    rev = "13fb20a9787c14bfc4c7996ce27d7224aa815812";
  +    rev = "1890b34fa39d236a20a5ab69627d3c7f91fabdb9";
       owner  = "vishvananda";
       repo   = "netlink";
  -    sha256 = "0jdh7n2lvvk23f9pwww911lcb3941iy1lvbwk23yhix9iz1xsz9f";
  -    date = "2016-12-17";
  +    sha256 = "0kfcr4v0j2z7jcx8w2q4q1n8kkib9nwdm5c0n761vzdlfmnrgmgl";
  +    date = "2017-01-05";
       propagatedBuildInputs = [
         netns
       ];
  
positive.code:       profile
        structs
      ];
      date = "2017-01-01";
    };
  
    mdns = buildFromGitHub {
  
negative.code: 
    go-multiaddr-net = buildFromGitHub {
      version = 2;
      rev = "ac78277d261389cb97c3d0eae06260b3bfcbe4da";
      owner  = "multiformats";
      repo   = "go-multiaddr-net";
      sha256 = "11cr9nz6g8h0xc8ac4crvvqjfqpnbsjalybhqi5b7n8x7vxfjhmf";
      date = "2017-01-06";
      goPackageAliases = [ "github.com/jbenet/go-multiaddr-net" ];
      propagatedBuildInputs = [
        go-multiaddr
  