The normal version of SDL will not be able to create windows on all the screens of the YURT. Instead you'll be able to create one screen on DISPLAY 0.0. To resolve this you can use the patched YURT-SDL version above.

A pre-built version is included with this library, but you can build one yourself!

1. Run: `./install_ubuntu.sh` or `install_centos.sh` depending on the platform you're running.

2. Run `./build.sh` this will build both development, release, and release PIC static versions, as well as debug and release shared library versions of (YURT) SDL.

To run a program on YURT display, specifiy the `DISPLAY` and `SDL_DISPLAY_START` environment variables.

For instance, to run on display 3, run: `DISPLAY=:0.3 SDL_DISPLAY_START=3 ./my-sdl-app`

If SDL_DISPLAY_START is not specified the default is 0.

You can either have your project build and use SDL library or use LD_PRELOAD.

If you're porting an application and don't want to mess with its build system, LD_PRELOAD is probably easier. Note this ONLY works if SDL is being loaded as a shared library LD_PRELOAD will cause the program to use the YURT version of SDL rather than the default one used by the project.

For instance, to run on display 3, run: `LD_PRELOAD=/path/to/YURT-SDL/build-SDL-Shared-Release/libSDL2-2.0.so DISPLAY=:0.3 SDL_DISPLAY_START=3 ./my-sdl-app`

You can also use that `libSDL2-2.0.so.0` in the root of the project directory.