Index: ruby-1.9.1-p129/ext/dl/depend
===================================================================
--- ruby-1.9.1-p129.orig/ext/dl/depend
+++ ruby-1.9.1-p129/ext/dl/depend
@@ -18,7 +18,8 @@ callback-8.o: callback-8.c $(hdrdir)/rub
 
 callback-0.c callback-1.c callback-2.c \
 callback-3.c callback-4.c callback-5.c \
-callback-6.c callback-7.c callback-8.c \
+callback-6.c callback-7.c callback-8.c: callback.h
+
 callback.h: $(srcdir)/mkcallback.rb dl.h
 	@echo "generating callback.h"
 	@$(RUBY) $(srcdir)/mkcallback.rb $(srcdir)/dl.h