Which version of SDL2 did you use to make Descent? It looks really good, but I've been having some issues with using SDL2 for my project
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A bit late, but i followed the guide on: http://sphere.sourceforge.net/flik/docs/psp-with-sdl2.html to get it running. Apparently my game crashes when running on real hardware, but I don't think it has anything to do with SDL2 (maybe the audio part though). Good luck!