diff --git a/make/projects-dir.mk b/make/projects-dir.mk
index 4bd294ea..988f3029 100644
--- a/make/projects-dir.mk
+++ b/make/projects-dir.mk
@@ -31,7 +31,8 @@ all: links.done clone.done cvs-update.done
 
 all clean: config.done
 	python ./ytools/devutil/scripts/build.py -b $(shell pwd) $@ $(filter-out $(EXCLUDE_FROM_BUILD),$(PROJECTS))
-	rm -f *.done
+
+clean: done.clean
 
 clean-dirs:
 	ls */dirs-all.done 2>/dev/null | sed 's%/.*%%' | xargs -r build.py -b $(shell pwd) clean
@@ -86,11 +87,14 @@ config.done:
 	make -C ytools config
 
 links.done:
-	ln -s btools dspider-btools
-	ln -s dspc/src/shared dspider-shared
+	ln -sf btools dspider-btools
+	ln -sf dspc/src/shared dspider-shared
 	touch $@
 
 %.done: %
 	touch $@
 
 
+done.clean:
+	rm -f *.done
+