nixpkgs/pkgs/misc/bleeding-edge-fetch-info/syb_with_class.nix

 args: with args; fetchurl { 
  url = http://mawercer.de/~nix/repos/syb_with_class.tar.gz;
  sha256 = "6893a44c6831b3fd10587c275b82903d24b8a51409eead9ec2c530300f2e6542";}