v4.19.13 snapshot.
diff --git a/include/linux/if_ltalk.h b/include/linux/if_ltalk.h
new file mode 100644
index 0000000..4cc1c0b
--- /dev/null
+++ b/include/linux/if_ltalk.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_LTALK_H
+#define __LINUX_LTALK_H
+
+#include <uapi/linux/if_ltalk.h>
+
+extern struct net_device *alloc_ltalkdev(int sizeof_priv);
+#endif