anchor.diff:      mkdir -p $out/etc/udev/rules.d
       cp -p ${udevRules}/etc/udev/rules.d/*.rules \
         $out/etc/udev/rules.d
  +    runHook postInstall
     '';
   
     dontStrip = true;
  
positive.code:   '';
  
    installPhase = with lib; ''
      PATH_TO_BRSCAN4="opt/brother/scanner/brscan4"
      mkdir -p $out/$PATH_TO_BRSCAN4
      cp -rp $PATH_TO_BRSCAN4/* $out/$PATH_TO_BRSCAN4
  
negative.code:   buildInputs = [ libusb-compat-0_1 ];
    dontBuild = true;
  
    postPatch = ''
      ${myPatchElf "opt/brother/scanner/brscan4/brsaneconfig4"}
  
      RPATH=${libusb-compat-0_1.out}/lib
  