anchor.diff:      rm $out/etc/udev/rules.d/56-hpmud.rules
     '';
   
  -  fixupPhase = ''
  -    # Wrap the user-facing Python scripts in $out/bin without turning the
  -    # ones in $out /share into shell scripts (they need to be importable).
  -    # Note that $out/bin contains only symlinks to $out/share.
  -    for bin in $out/bin/*; do
  -      py=`readlink -m $bin`
  -      rm $bin
  -      cp $py $bin
  -      wrapPythonProgramsIn $bin "$out $pythonPath"
  -      sed -i "s@$(dirname $bin)/[^ ]*@$py@g" $bin
  -    done
  -
  -    # Remove originals. Knows a little too much about wrapPythonProgramsIn.
  -    rm -f $out/bin/.*-wrapped
  -
  -    # Merely patching shebangs in $out/share does not cause trouble.
  -    for i in $out/share/hplip{,/*}/*.py; do
  -      substituteInPlace $i \
  -        --replace /usr/bin/python \
  -        ${pythonPackages.python}/bin/${pythonPackages.python.executable} \
  -        --replace "/usr/bin/env python" \
  -        ${pythonPackages.python}/bin/${pythonPackages.python.executable}
  -    done
  -
  -    wrapPythonProgramsIn $out/lib "$out $pythonPath"
  -
  +  postFixup = ''
       substituteInPlace $out/etc/hp/hplip.conf --replace /usr $out
     '' + stdenv.lib.optionalString (!withPlugin) ''
       # A udev rule to notify users that they need the binary plugin.
  
positive.code: , cups, zlib, libjpeg, libusb1, pythonPackages, sane-backends, dbus, usbutils
  , net_snmp, openssl, polkit
  , bash, coreutils, utillinux
  , qtSupport ? true, qt4
  , withPlugin ? false
  }:
  
  
negative.code: assert withPlugin -> builtins.elem hplipArch pluginArches
    || throw "HPLIP plugin not supported on ${stdenv.system}";
  
  pythonPackages.mkPythonDerivation {
    inherit name src;
  
    buildInputs = [
      libjpeg
      cups
      libusb1
      sane-backends
      dbus
      net_snmp
      openssl
    ];
  
    nativeBuildInputs = [
      pkgconfig
    ];
  
    propagatedBuildInputs = with pythonPackages; [
      dbus
      pillow
      pygobject2
      reportlab
      usbutils
    ] ++ stdenv.lib.optionals qtSupport [
  