BR2_nios2=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-nios2-full-2017.11-rc1.tar.bz2" BR2_TOOLCHAIN_EXTERNAL_GCC_6=y BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_13=y BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y BR2_TOOLCHAIN_EXTERNAL_CXX=y