buildroot/support/config-fragments/autobuild/br-arm-basic.config

BR2_arm=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
BR2_TOOLCHAIN_EXTERNAL_URL="http://autobuild.buildroot.org/toolchains/tarballs/br-arm-basic-2020.11.2.tar.bz2"
BR2_TOOLCHAIN_EXTERNAL_GCC_9=y
BR2_TOOLCHAIN_EXTERNAL_HEADERS_5_9=y
# BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_DEBUG is not set