anchor.diff:  }:
   
   let
  -  date = "2016-02-15";
  -  gitRev = "bd8bceaed2311651710331a7f8990c3e31be9840";
  +  date = "2016-07-10";
  +  gitRev = "115f1af2494ded1fcd21c8419d5e289bc4df380f";
   in
   
   stdenv.mkDerivation rec {
  
positive.code:       src = fetchgit {
          url = "http://git.code.sf.net/p/net-tools/code";
          rev = gitRev;
          sha256 = "1h8iryf5qc4svyz2ri1v4a8117w4r79rw6iqn8n7qavg0w45b30k";
        };
  
        buildPhase = ''
          cp -rv ${src} ${name}
          tar Jcfv ${name}.tar.xz ${name}
        '';
  
        installPhase = ''
  
negative.code: 
    src = fetchurl {
      name = "${name}.tar.xz";
      multihash = "QmSDSsjomFu6VZ5szCWGh9hyYQDFRKzFbQRJ1Deafh1cm7";
      sha256 = "fc8ebe223a7144b6cde07eceac3b7ed7e71b350107002a21162542680ddfee2d";
    };
  
    nativeBuildInputs = [
  