Install devkitpro's devkitARM, the devkitarm-rules and devkitarm-crtls
files, and set DEVKITPRO to the path where you installed it.
After that, arm-none-eabi* should resolve to the tools in this kit
with the proper files in place, not the one in the system.

If all goes well:
	make && vba *.gba

Have fun!