anchor.diff:  { stdenv, fetchurl, automake, pkgconfig
   , cups, zlib, libjpeg, libusb1, pythonPackages, saneBackends, dbus
  -, polkit, qtSupport ? true, qt4, pythonDBus, pyqt4, net_snmp
  -, withPlugin ? false, substituteAll
  +, polkit, qtSupport ? true, qt4, pyqt4, net_snmp
  +, withPlugin ? false, substituteAll, makeWrapper
   }:
   
   let
  
positive.code:     ] ++ stdenv.lib.optional qtSupport qt4;
  
    pythonPath = with pythonPackages; [
        pillow
        pythonDBus
        pygobject
        recursivePthLoader
        reportlab
  
negative.code:       then licenses.unfree
        else with licenses; [ mit bsd2 gpl2Plus ];
      platforms = [ "i686-linux" "x86_64-linux" "armv6l-linux" "armv7l-linux" ];
      maintainers = with maintainers; [ ttuegel jgeerds nckx ];
    };
  }
  