From 16267a1889f077b734eb7ff1793e7d3a8b0e763b Mon Sep 17 00:00:00 2001
From: Daniel Pouzzner <douzzer@wolfssl.com>
Date: Thu, 3 Sep 2020 23:10:50 -0500
Subject: [PATCH] configure.ac: error when ENABLED_LINUXKM but $KERNEL_ARCH is
 empty (no default, no user value).

---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index eb1b6360a..623392f30 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3385,6 +3385,9 @@ then
     if test "${KERNEL_ROOT}" = ""; then
         AC_MSG_ERROR([Linux kernel source root not found -- supply with --with-linux-source=PATH.])
     fi
+    if test "${KERNEL_ARCH}" = ""; then
+        AC_MSG_ERROR([Linux kernel target architecture for build tree ${KERNEL_ROOT} could not be determined.  Is target kernel configured?])
+    fi
 
     ENABLED_NO_LIBRARY=yes
 fi