copied from https://github.com/Serranya/sdl2-vala-lazy-foo
sudo apt-get install build-essential libsdl2-dev libsdl2-gfx-dev libsdl2-image-dev libsdl2-mixer-dev libsdl2-net-dev libsdl2-ttf-dev
git clone https://github.com/sdl2-vapi/sdl2-vapi.git cd sdl2-vapi sudo cp --force *.vapi /usr/share/vala/vapi sudo cp --force *.deps /usr/share/vala/vapi