This buildroot can be used to build RetroFW cross-compilation toolchain and the OS image.

First, clone or download the repo and run:

make RetroFW_defconfig BR2_EXTERNAL=retrofw

You only need to run this once.

Then, to build the toolchain, run:

make toolchain

You can also build particular libraries and packages this way, for example to build SDL and SDL_Image:

make sdl sdl_image

To build the OS image, run:

make

NOTE: Set BR2_JLEVEL=0 to compile in parallel.