anchor.diff:    prePatch = ''
       sed -i s,/etc/sane.d,$out/etc/sane.d/, Makefile.in
       sed -i s,/etc/hp/,$out/etc/hp/, base/g.py
  +    substituteInPlace Makefile.in \
  +      --replace "/usr/include/libusb-1.0" "${libusb1}/include/libusb-1.0" \
  +      --replace "/usr/lib/systemd/system" "$out/lib/systemd/system"
     '';
   
     # --disable-network-build Until we have snmp
  
positive.code:   buildInputs = [
        libjpeg
        cups
        libusb
        pythonPackages.python
        pythonPackages.wrapPython
        saneBackends
  
negative.code: {stdenv, fetchurl, cups, zlib, libjpeg, libusb1, pythonPackages, saneBackends, dbus
  , pkgconfig, polkit, qtSupport ? true, qt4, pythonDBus, pyqt4, net_snmp, automake
  }:
  
  stdenv.mkDerivation rec {
    name = "hplip-3.14.4";
  
    src = fetchurl {
      url = "mirror://sourceforge/hplip/${name}.tar.gz";
      sha256 = "1j8h44f8igl95wqypj4rk9awcw513hlps980jmcnkx60xghc4l6f";
    };
  
    #preBuild=''
  