@@ -218,11 +218,12 @@
 	echo "(define megatest-fossil-hash \"$(MTESTHASH)\")" > megatest-fossil-hash.new
 	if ! diff -q megatest-fossil-hash.new megatest-fossil-hash.scm ; then echo copying .new to .scm;cp -f megatest-fossil-hash.new megatest-fossil-hash.scm;fi
 
 $(OFILES) $(GOFILES) : common_records.scm 
 
-%.o : %.scm
+# TODO: make modules.scm changes trigger rebuild. modules.scm in following recipe does not work.
+%.o : %.scm modules.scm
 	csc $(CSCOPTS) -c $<
 
 $(PREFIX)/bin/.$(ARCHSTR)/mtest : mtest utils/mk_wrapper
 	@echo Installing to PREFIX=$(PREFIX)
 	$(INSTALL) mtest $(PREFIX)/bin/.$(ARCHSTR)/mtest