To be able to build firmware for ARM Targets, you'll need to install the GNU Toolchain for ARM Devices. An installer for Windows and archives for Linux/Windows
can be found [https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads here]. If you use the installer, make sure the "Add path to environment variable", "Add registry information", and "Launch gccvar.bat" boxes are ticked. If you're using an a Linux based operating system (like the VM), you can install the toolchain via your package manager. For example, in the VM run <code>sudo apt-get install gcc-arm-none-eabi</code> in a terminal: