=== Preparing the building environment ===
* Ubuntu cross-toolchain for ARM has to be installed, using <code>apt-get</code>
sudo apt-get install git python3 curl xz-utils sudo apt-get install gcc-arm-linux-gnueabihf g++-9-arm-linux-gnueabihf gcc-multilib sudo apt-get install g++-arm-linux-gnueabihf g++-multilib
=== Building the SDK ===
The git repository from Google source can be cloned