anchor.diff:    doCheck = true;
   
     nativeBuildInputs = [
  -    meson ninja vala pkgconfig gettext wrapGAppsHook gobjectIntrospection desktop-file-utils
  +    meson ninja vala pkgconfig gettext itstool wrapGAppsHook gobjectIntrospection desktop-file-utils
     ];
   
     buildInputs = [
  
positive.code: 
    preFixup = ''
      gappsWrapperArgs+=(--prefix PATH : "${stdenv.lib.makeBinPath [ mtools cdrkit libcdio qemu ]}")
    '';
  
    passthru = {
  
negative.code: { stdenv, fetchurl, meson, ninja, wrapGAppsHook, pkgconfig, gettext, itstool, libvirt-glib
  , glib, gobjectIntrospection, libxml2, gtk3, gtkvnc, libvirt, spice-gtk
  , spice-protocol, libsoup, libosinfo, systemd, tracker, tracker-miners, vala
  , libcap, yajl, gmp, gdbm, cyrus_sasl, gnome3, librsvg, desktop-file-utils
  