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