anchor.diff:  
     gopacket = buildFromGitHub {
       version = 6;
  -    rev = "f1dcaa0fbe0cbf307fc9247ecc348f48b0c2f4d3";
  +    rev = "60ab61cd59496fcfa4d208b265ba79b1e37c1476";
       owner = "google";
       repo = "gopacket";
  -    sha256 = "0by40pwq002vqps032drsfydzkz1n4z7ma8n0i7jlzlrnaaxwrwq";
  +    sha256 = "1w6dq4bi4x2bcp6bwm5a2dcr92llv21gzwbxbb34mkhqvq4iqff6";
       buildInputs = [
         pkgs.libpcap
         pkgs.pf-ring
  
positive.code: 
    selinux = buildFromGitHub {
      version = 6;
      rev = "85296ae73fc746c142a92bd4477ea0ba5bd1b39d";
      owner = "opencontainers";
      repo = "selinux";
      sha256 = "14jmmpsbwl71clpimjl448wg1x965nq08nk2d5v4sp3ffy2fxr8b";
      date = "2018-04-24";
    };
  
    semver = buildFromGitHub {
  
negative.code:     version = 6;
      owner = "hashicorp";
      repo = "vault-plugin-auth-gcp";
      rev = "dda308cd00d706077f9aa17c4890fc0b6a00a354";
      sha256 = "13fpnwyyanh163907db3vjxk20p0n386fprzqf04a4nrv46r5pqv";
      date = "2018-05-21";
      propagatedBuildInputs = [
        go-cleanhttp
        google-api-go-client
  