1 files changed, 1 insertions, 1 deletions
diff --git a/configure b/configure
index 0868ade..a166133 100755
--- a/configure
+++ b/configure
@@ -346,7 +346,7 @@ for opt do
 done
 
 # default flags for all hosts
-CFLAGS="$CFLAGS -Wall -O2 -g -fno-strict-aliasing"
+CFLAGS="$CFLAGS -Wall -Wundef -O2 -g -fno-strict-aliasing"
 LDFLAGS="$LDFLAGS -g"
 if test "$werror" = "yes" ; then
 CFLAGS="$CFLAGS -Werror"