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-rw-r--r--erts/configure.in1
1 files changed, 1 insertions, 0 deletions
diff --git a/erts/configure.in b/erts/configure.in
index 4bff2ebf3d..fe340b34eb 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -533,6 +533,7 @@ if test "x$GCC" = xyes; then
# Treat certain GCC warnings as errors
LM_TRY_ENABLE_CFLAG([-Werror=return-type], [WERRORFLAGS])
LM_TRY_ENABLE_CFLAG([-Werror=implicit], [WERRORFLAGS])
+ LM_TRY_ENABLE_CFLAG([-Werror=undef], [WERRORFLAGS])
# until the emulator can handle this, I suggest we turn it off!
#WFLAGS="-Wall -Wshadow -Wcast-qual -Wmissing-declarations"