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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index f7620268..321ab2c0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -197,7 +197,7 @@ dnl skipped and all flags rechecked. So there's no need to do anything
dnl else. If for any reason you need to force a recheck, just change
dnl MAYBE_WARN in an ignorable way (like adding whitespace)
-MAYBE_WARN="-Wall -Wextra -Wundef \
+MAYBE_WARN="-Wall -Wextra -Werror=undef \
-Wsign-compare -Werror-implicit-function-declaration \
-Wpointer-arith -Wwrite-strings -Wstrict-prototypes \
-Wmissing-prototypes -Wmissing-declarations -Wnested-externs \