anchor.diff:  
     buildInputs = [ cairo colord glib gusb gtk3 libusb libxml2 saneBackends
       systemd vala ];
  -  nativeBuildInputs = [ intltool itstool makeWrapper pkgconfig ];
  +  nativeBuildInputs = [ intltool itstool pkgconfig wrapGAppsHook ];
   
     configureFlags = [ "--disable-packagekit" ];
   
  
positive.code:   enableParallelBuilding = true;
  
    doCheck = true;
  
    preFixup = ''
      wrapProgram "$out/bin/simple-scan" \
        --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH"
    '';
  
    meta = with stdenv.lib; {
      inherit version;
  
negative.code: { stdenv, fetchurl, cairo, colord, glib, gtk3, gusb, intltool, itstool, libusb
  , libxml2, pkgconfig, saneBackends, systemd, vala, wrapGAppsHook }:
  
  let version = "3.19.2"; in
  stdenv.mkDerivation rec {
  