--- /dev/null
+# subdirmk - useful rules for clean target
+# Copyright 2019 Mark Wooding
+# Copyright 2019 Ian Jackson
+# SPDX-License-Identifier: LGPL-2.0-or-later
+
+&# Usage:
+&# &:include subdirmk/clean.sd.mk
+&# (probably in Perdir.sd.mk)
+&#
+&# Provides a per-directory `clean' target, which deletes all the files
+&# in &CLEAN. &OBJECTS, &DEPFILES and &TARGETS are automatically deleted.
+&#
+&# If you want to delete a directory, extend the target with
+&# &/clean::
+&# $(RM) -r somethingn
+&# ($(RM) conventionally contains `-f'.)
+
+&CLEAN += & *~ *.tmp
+&CLEAN += $(&OBJECTS)
+&CLEAN += $(&TARGETS)
+
+# &TARGETS_clean
+
+&/clean::
+ $(RM) $(&CLEAN)