--- a/src/events/SDL_mouse_c.h	Thu Apr 25 18:40:22 2013 -0700
+++ b/src/events/SDL_mouse_c.h	Thu Apr 25 18:40:29 2013 -0700
@@ -73,6 +73,9 @@
     SDL_Cursor *def_cursor;
     SDL_Cursor *cur_cursor;
     SDL_bool cursor_shown;
+
+    /* Driver-dependent data. */
+    void *driverdata;
 } SDL_Mouse;