_ACEOF
echo make -C $LINUX_KERNEL_PATH M=$SRCDIR_PARENT/conftest.dir modules KBUILD_VERBOSE=1 >&AS_MESSAGE_LOG_FD &&
make -C $LINUX_KERNEL_PATH M=$SRCDIR_PARENT/conftest.dir modules KBUILD_VERBOSE=1 >&AS_MESSAGE_LOG_FD 2>conftest.err &&
- ! grep "^WARNING: .* undefined!$" conftest.err >/dev/null 2>&1
+ ! grep -i "^WARNING: .* undefined!$" conftest.err >/dev/null 2>&1
then [$3]
else
sed '/^ *+/d' conftest.err >&AS_MESSAGE_LOG_FD