v4.19.13 snapshot.
diff --git a/include/linux/auxvec.h b/include/linux/auxvec.h
new file mode 100644
index 0000000..f68d0ec
--- /dev/null
+++ b/include/linux/auxvec.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_AUXVEC_H
+#define _LINUX_AUXVEC_H
+
+#include <uapi/linux/auxvec.h>
+
+#define AT_VECTOR_SIZE_BASE 20 /* NEW_AUX_ENT entries in auxiliary table */
+  /* number of "#define AT_.*" above, minus {AT_NULL, AT_IGNORE, AT_NOTELF} */
+#endif /* _LINUX_AUXVEC_H */