--- a/include/SDL_thread.h	Fri Feb 10 03:21:39 2006 +0000
+++ b/include/SDL_thread.h	Fri Feb 10 06:48:43 2006 +0000
@@ -29,6 +29,7 @@
 */
 
 #include "SDL_stdinc.h"
+#include "SDL_error.h"
 
 /* Thread synchronization primitives */
 #include "SDL_mutex.h"