anchor.diff:    };
   
     xxhash = buildFromGitHub {
  -    version = 2;
  -    rev = "09e1e23aaa83fc6b47aa8aedbb62846c521ede77";
  +    version = 3;
  +    rev = "1b6d2e40c16ba0dfce5c8eac2480ad6e7394819b";
       owner  = "cespare";
       repo   = "xxhash";
  -    sha256 = "10axqp9jvwj7ssqh11qzx3k5n6b7rq5zvk7jlna54bxdvqlfmrwd";
  -    date = "2017-03-30";
  +    sha256 = "0lnc15cw0rvcpcqh91dx7ljrd2dl1g5c77xpqs956q81g7bq0ls4";
  +    date = "2017-06-04";
     };
   
     zap = buildFromGitHub {
  
positive.code: 
    netlink = buildFromGitHub {
      version = 3;
      rev = "7bd45e5974271cfe07cb4697b79cf6ec63f78700";
      owner  = "vishvananda";
      repo   = "netlink";
      sha256 = "1qgc4q885g32n6axiqdp5ip68rv6mj0x9irxr4s5fb9smmnm7id1";
      date = "2017-05-31";
      propagatedBuildInputs = [
        netns
      ];
  
negative.code: 
    docker_cli = buildFromGitHub {
      version = 3;
      date = "2017-06-07";
      rev = "9d12d6fc870b3f457d6d317241a8ca2f3f6ff72f";
      owner = "docker";
      repo = "cli";
      sha256 = "1zf0ldw0darcgbbglcza5sswzk1c9svvw0v55qj4b877bjqklllc";
      subPackages = [
        "cli/config/configfile"
      ];
  