if [ "$1" = "configure" ] && [ -e "${DPKG_ROOT}/etc/nsswitch.conf" ] ; then
	if ! grep -q -E '^[^#:]+:[^#]*\s(#SERVICE_NAMES#)(\s|#|$)' "${DPKG_ROOT}/etc/nsswitch.conf" ; then
		#OPERATIONS#
	fi
fi
