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commit 9e0b7ead828993280955f71afa3ad689f5e6e0a8
Author: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Date:   Wed May 20 10:56:56 2020 +0300

    Makefile: fix getting kernel version
    
    When backports build as a recipe, there is no Makefile available
    in STAGING_KERNEL_BUILDDIR. Instead use the preset KERNEL_VERSION.
    
    Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>

diff --git a/Makefile b/Makefile
index ee7df4ba..11044c0a 100644
--- a/Makefile
+++ b/Makefile
@@ -84,7 +84,7 @@ mrproper:
 				echo ""							;\
 			done								\
 		) > Kconfig.kernel							;\
-		kver=$$($(MAKE) --no-print-directory -C $(KLIB_BUILD) kernelversion |	\
+		kver=$$(echo $(KERNEL_VERSION) |	\
 			sed 's/^\(\([3-5]\|2\.6\)\.[0-9]\+\).*/\1/;t;d')		;\
 		test "$$kver" != "" || echo "Kernel version parse failed!"		;\
 		test "$$kver" != ""							;\