--- Makefile.orig	Sat Oct 10 06:15:02 1998
+++ Makefile	Mon May  6 15:51:59 2013
@@ -145,3 +145,4 @@ dist: FORCE
 	rm -fr sp-$$version
 
 FORCE:
+.PHONY: $(LIBDIRS) $(PROGDIRS) $(TARGETS)