The default value for the keyboard layout is XKBLAYOUT="${XKBLAYOUT}" and XKBVARIANT="${XKBVARIANT}".  This default value is based on the currently defined language/region and the settings in /etc/X11/xorg.conf.
Azal amezwer i tneɣruft n unasiw d XKBLAYOUT="${XKBLAYOUT}" d XKBVARIANT="${XKBVARIANT}".  Azal-a amezwer yebna ɣef tutlayt/tamurt yettusbadun akka tura d yiɣewwaren deg /rtg/X11/xorg.conf.