Index: longrun_tests/Makefile.am
===================================================================
--- longrun_tests/Makefile.am	(revision ffd5948e6b6df0fc8f2abad68ed521244aecd285)
+++ longrun_tests/Makefile.am	(revision 454b4e01b75e00e1a232a34fc6777a3e01b733c2)
@@ -36,4 +36,6 @@
 	-g \
 	-Wall \
+	-Wextra \
+	-Werror=return-type
 	-Wno-unused-function \
 	-quiet \