anchor.diff:        pythonPackages.wrapPython
         saneBackends
         dbus
  -      pkgconfig] ++
  -    stdenv.lib.optional qtSupport qt4;
  +      pkgconfig
  +      net_snmp
  +    ] ++ stdenv.lib.optional qtSupport qt4;
   
     pythonPath = with pythonPackages; [
         pythonDBus
  
positive.code: {stdenv, fetchurl, cups, zlib, libjpeg, libusb, pythonPackages, saneBackends, dbus
  , pkgconfig, polkit, qtSupport ? true, qt4, pythonDBus, pyqt4
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:       --with-systraydir=$out/xdg/autostart
        --with-mimedir=$out/etc/cups
        --enable-policykit
      "
  
      export makeFlags="
        halpredir=$out/share/hal/fdi/preprobe/10osvendor
  