--- acm4-4.7.orig/Makefile.in
+++ acm4-4.7/Makefile.in
@@ -10,7 +10,7 @@
 all install uninstall clean mostlyclean realclean tags info dvi dist check depend:
 	@for i in $(SUBDIRS) ; do \
 		echo Making $@ in ./$${i} ... ; \
-		( cd $$i ; $(MAKE) $(MFLAGS) $@ ) ; \
+		( cd $$i ; $(MAKE) $(MFLAGS) $@ ) || exit 1; \
 	done
 
 Makefile: Makefile.in config.status
@@ -25,6 +25,6 @@
 distclean:
 	@for i in $(SUBDIRS) ; do \
 		echo Making $@ in ./$${i} ... ; \
-		( cd $$i ; $(MAKE) $(MFLAGS) $@ ) ; \
+		( cd $$i ; $(MAKE) $(MFLAGS) $@ ) || exit 1; \
 	done
 	rm -f Makefile config.status