anchor.diff:  
     go-ethereum = buildFromGitHub {
       version = 3;
  -    date = "2017-05-05";
  -    rev = "2ec5cf1673e19da85471892875934fe0564a209d";
  +    date = "2017-05-08";
  +    rev = "d18b509e40c5d41a9ab25cd23c282b7502ff1f2a";
       owner  = "ethereum";
       repo   = "go-ethereum";
  -    sha256 = "0pki9bnxb7hxfjbjklcdjy9cwp5bcm0wf7wlzjfrhccgfb01xnb8";
  +    sha256 = "1rmnfn6b2sfxigi00wm2h60brx537y2ysbizcmqxll0n08jgfir3";
       subPackages = [
         "crypto/sha3"
       ];
  
positive.code: 
    gopacket = buildFromGitHub {
      version = 3;
      rev = "b0b789be7511f047cf2cf6bf9ef61bf83ebfb8c3";
      owner = "google";
      repo = "gopacket";
      sha256 = "0yscsqj9pdd1h0j7rv78v0bv1cz56cxqmawrfyjv65zwdpww1vdb";
      buildInputs = [
        pkgs.libpcap
        pkgs.pf-ring
  
negative.code:   };
  
    jwt-go = buildFromGitHub {
      version = 3;
      owner = "dgrijalva";
      repo = "jwt-go";
      rev = "6c8dedd55f8a2e41f605de6d5d66e51ed1f299fc";
      sha256 = "0b7dakw71aa1lq21zivnx4q956g0z0wl96wnz9sq2dl3xy0cs576";
      date = "2017-05-08";
    };
  
    kcp-go = buildFromGitHub {
  