clean:
rm -f *.o lxdialog/*.o *.moc $(clean-files) conf mconf qconf
-clean-files :=
+# This clean-files definition is here to ensure that temporary files from the
+# previous version are removed by make config-clean.
+# It should be removed or emptied when this Makefile get updated again.
+clean-files := zconf.tab.c zconf.lex.c zconf.hash.c .tmp_qtcheck
# ===========================================================================
# Variables needed by the upstream Makefile