We can use specific ourclean target

main.mk

@@ -1,4 +1,4 @@
-# $Amigan: phoned/main.mk,v 1.2 2005/06/01 00:43:07 dcp1990 Exp $
+# $Amigan: phoned/main.mk,v 1.3 2005/06/18 03:10:32 dcp1990 Exp $
 all: .depend ${MAINBIN}
 # I know, I know, but it's good.
 .depend: ${SRCS} ${OHDRS}
@@ -9,5 +9,5 @@ ${MAINBIN}: ${OBJS}
 %.o: %.c
 	${CC} ${CFLAGS} -c ${.SOURCE}
 # end ours
-clean:
+clean: ourclean
 	rm -f *.o ${MAINBIN} .depend *~ *.core ${CLEANFILES}