anchor.diff:  
     gopacket = buildFromGitHub {
       version = 6;
  -    rev = "157f9f84344746b9ed8ca4e92db2419ad94d4fc6";
  +    rev = "f1dcaa0fbe0cbf307fc9247ecc348f48b0c2f4d3";
       owner = "google";
       repo = "gopacket";
  -    sha256 = "0ras57af52r646h4v1nila7yllkfq45ap23m1y4ml1r42fn2fic9";
  +    sha256 = "0by40pwq002vqps032drsfydzkz1n4z7ma8n0i7jlzlrnaaxwrwq";
       buildInputs = [
         pkgs.libpcap
         pkgs.pf-ring
  
positive.code:   };
  
    xsecretbox = buildFromGitHub {
      version = 5;
      rev = "88b1956e8d9a013c98dda528d3a5b77f168b057f";
      owner  = "jedisct1";
      repo   = "xsecretbox";
      sha256 = "0fb8sb29z6h3j9lapcqszv5bzv2wq5j7swhi0mb4iflxcig9shjn";
      date = "2018-02-14";
      propagatedBuildInputs = [
        chacha20
        crypto
        poly1305
      ];
    };
  
    xstrings = buildFromGitHub {
      version = 3;
      rev = "d6590c0c31d16526217fa60fbd2067f7afcd78c5";
      date = "2017-09-08";
      owner  = "huandu";
      repo   = "xstrings";
      sha256 = "03ff5krgpq5js8bm32vj31qc7z45a0cswa97c5bqn9kag44cmidm";
    };
  
    cespare_xxhash = buildFromGitHub {
  
negative.code:   };
  
    fwd = buildFromGitHub {
      version = 6;
      rev = "v1.0.0";
      owner  = "philhofer";
      repo   = "fwd";
      sha256 = "0z0z6f7lwbi1a6lw7xj3mmyxy0dmdgxlcids9wl1dgadmggvwb8f";
    };
  
    gabs = buildFromGitHub {
  