diff -r daff4d9cedc6 src/video/x11/SDL_x11sym.h
--- a/src/video/x11/SDL_x11sym.h        Mon May 27 21:44:16 2013 -0700
+++ b/src/video/x11/SDL_x11sym.h        Wed May 29 18:06:08 2013 -0400
@@ -203,7 +203,7 @@
  */
 #ifdef LONG64
 SDL_X11_MODULE(IO_32BIT)
-SDL_X11_SYM(int,_XData32,(Display *dpy,register long *data,unsigned len),(dpy,data,len),return)
+SDL_X11_SYM(int,_XData32,(Display *dpy,register _Xconst long *data,unsigned len),(dpy,data,len),return)
 SDL_X11_SYM(void,_XRead32,(Display *dpy,register long *data,long len),(dpy,data,len),)
 #endif