TOP_DIR=/opt

export ARCH=arm
export CC=aarch64-linux-gnu-gcc
export CXX=aarch64-linux-gnu-g++
TOOLCHAIN=$TOP_DIR/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin
export CROSS_COMPILE=$TOOLCHAIN/aarch64-linux-gnu
export PATH=$TOOLCHAIN:$PATH
${CC} -v