Index: Makefile.in
===================================================================
--- Makefile.in.orig	2005-07-18 04:25:21.000000000 +0200
+++ Makefile.in	2009-11-24 17:22:25.561564000 +0100
@@ -59,13 +59,16 @@ all: example$(EXE) minigzip$(EXE)
 check: test
 test: all
 	@LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
-	echo hello world | ./minigzip | ./minigzip -d || \
-	  echo '		*** minigzip test FAILED ***' ; \
+	ret=0; \
+	if ! echo hello world | ./minigzip | ./minigzip -d; then \
+	  echo '		*** minigzip test FAILED ***'; ret=1; \
+	fi; \
 	if ./example; then \
 	  echo '		*** zlib test OK ***'; \
 	else \
-	  echo '		*** zlib test FAILED ***'; \
-	fi
+	  echo '		*** zlib test FAILED ***'; ret=1; \
+	fi; \
+	exit $$ret
 
 libz.a: $(OBJS) $(OBJA)
 	$(AR) $@ $(OBJS) $(OBJA)