Index: buildsys.mk.in
==================================================================
--- buildsys.mk.in
+++ buildsys.mk.in
@@ -133,11 +133,13 @@
 			${DEPEND_FAILED}; \
 		fi; \
 	fi
 
 .c.c.dep .cc.cc.dep .cxx.cxx.dep .m.m.dep .mm.mm.dep .S.S.dep:
-	${CPP} ${CPPFLAGS} -M $< >$@ || (rm -f $@; exit 1)
+	${CPP} ${CPPFLAGS} -M $< | \
+	sed 's/^\([^\.]*\)\.o:/\1.o \1.lib.o \1.plugin.o:/' >$@ || \
+	(rm -f $@; exit 1)
 
 pre-depend:
 
 ${PROG} ${PROG_NOINST}: ${EXT_DEPS} ${OBJS}
 	${LINK_STATUS}