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-rw-r--r--crawl-ref/source/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/crawl-ref/source/Makefile b/crawl-ref/source/Makefile
index 898971c497..d1f244769c 100644
--- a/crawl-ref/source/Makefile
+++ b/crawl-ref/source/Makefile
@@ -120,7 +120,7 @@ CFOPTIMIZE := -O2
endif # USE_ICC
CFOTHERS := -pipe $(EXTERNAL_FLAGS)
-CFWARN := -Wall -Wformat-security
+CFWARN := -Wall -Wformat-security -Wmissing-declarations
CFWARN_L := -Wundef
DEFINES := $(EXTERNAL_DEFINES)