CT_CONFIG_VERSION="4" CT_PREFIX_DIR="/x-tools/${CT_TARGET}" CT_USE_MIRROR=y CT_MIRROR_BASE_URL="https://ci-mirrors.rust-lang.org/rustc" CT_ARCH_ARM=y CT_ARCH_64=y CT_KERNEL_LINUX=y CT_LINUX_V_4_1=y CT_GLIBC_V_2_17=y CT_CC_LANG_CXX=y