Make some dynamic X11 symbols option. _XData32 and _XRead32 are only available on 64-bit systems, and are chosen with macros in the X11 headers. So on 32-bit systems, it should fail to find these symbols and keep going anyhow.

/* Include the SDL main definition header */
#include "SDL_main.h"

#ifdef main
#undef main
int main(int argc, char *argv[])
{
	return(SDL_main(argc, argv));
}
#else
/* Nothing to do on this platform */;
#endif