Вопрос такой был к вам, по билдруту. Там можно генерировать сдк под рецепт?
Alternatively, Buildroot can also export the toolchain and the development files of all selected packages, as an SDK, by running the command make sdk. This generates a tarball of the content of the host directory output/host/, named <TARGET-TUPLE>_sdk-buildroot.tar.gz (which can be overriden by setting the environment variable BR2_SDK_PREFIX) and located in the output directory output/images/.