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-rwxr-xr-xunix/configure2
1 files changed, 1 insertions, 1 deletions
diff --git a/unix/configure b/unix/configure
index e7f8184..60d60cb 100755
--- a/unix/configure
+++ b/unix/configure
@@ -5036,7 +5036,7 @@ fi
if test "$GCC" = yes; then :
CFLAGS_OPTIMIZE=-O2
- CFLAGS_WARNING="-Wall -Wextra -Wshadow -Wwrite-strings -Wpointer-arith"
+ CFLAGS_WARNING="-Wall -Wextra -Wshadow -Wundef -Wwrite-strings -Wpointer-arith"
case "${CC}" in
*++|*++-*)
;;