Execute the following commands to extract the toolchain:
$ mkdir $HOME/l4t-gcc
$ cd $HOME/l4t-gcc
$ tar xf gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu.tar.xz
Setting the CROSS_COMPILE Environment Variable
Many build systems require you to set environment variable CROSS_COMPILE to point at the toolchain to use. To set CROSS_COMPILE for the aarch64 toolchain: