Patch from Martin Lange (mala-sdl at hotmail.com) to unregister SDL's win32 windowclass when shutting down the video subsystem...this allows you to safely unload/reload the SDL shared library on Windows between initializations. Discussion is here: http://www.devolution.com/pipermail/sdl/2005-February/067424.html

#ifndef _SDL_SYSMUTEX_C_H_
#define _SDL_SYSMUTEX_C_H_

struct SDL_mutex {
	pth_mutex_t mutexpth_p;
};

#endif /* _SDL_SYSMUTEX_C_H_ */