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Quoting the CMake documentation: When the CMAKE_SYSTEM_NAME variable is set explicitly to enable cross compiling then the value of CMAKE_SYSTEM_VERSION must also be set explicitly to specify the target system version. Thus, we should also set CMAKE_SYSTEM_VERSION in toolchainfile.cmake. It is supposed to be set to the value of `uname -r` on the target. We don't have that exact value available (unless we build the kernel), but the value of BR2_TOOLCHAIN_HEADERS_AT_LEAST contains the (minimum) version of the kernel it will run on, so it should be OK for all practical purposes. Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Cc: Samuel Martin <s.martin49@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>