anchor.diff:      version = 3;
       owner = "klauspost";
       repo = "reedsolomon";
  -    date = "2017-05-28";
  -    rev = "dde6ad55c5e5a6379a4e82dcca32ee407346eb6d";
  -    sha256 = "0zax3cjm4x1ql9xwf4n53cjqyzabaihwd7q281qjcicwrfmyjg6n";
  +    date = "2017-06-06";
  +    rev = "d4658f22be1d1b0a2e3b3f169489d6533da27ef7";
  +    sha256 = "16jzlwmh16zi2azvjqx6g6phngmad1ma4wb0sdx61cjf5ynn5hgq";
       propagatedBuildInputs = [
         cpuid
       ];
  
positive.code: 
    netlink = buildFromGitHub {
      version = 3;
      rev = "7bd45e5974271cfe07cb4697b79cf6ec63f78700";
      owner  = "vishvananda";
      repo   = "netlink";
      sha256 = "1qgc4q885g32n6axiqdp5ip68rv6mj0x9irxr4s5fb9smmnm7id1";
      date = "2017-05-31";
      propagatedBuildInputs = [
        netns
      ];
  
negative.code:   };
  
    barcode = buildFromGitHub {
      version = 3;
      owner = "boombuler";
      repo = "barcode";
      rev = "a4f901055aa151cd82782e5e2cd0000d5a48eed7";
      date = "2017-06-05";
      sha256 = "047xjysmhlybvx8gacjp2j41579c9ha35qkk7miy2k9y61v9mgj3";
    };
  
    bigfft = buildFromGitHub {
  