--- gcc/testsuite/gcc.dg/format/format.h.orig	Sat Nov 12 13:49:12 2011
+++ gcc/testsuite/gcc.dg/format/format.h	Sat Nov 12 13:49:42 2011
@@ -35,11 +35,13 @@
 #include <stdarg.h>
 #include <stddef.h>
 
+#ifndef _WINT_T_DEFINED_
 #ifndef _WINT_T
 #ifndef __WINT_TYPE__
 #define __WINT_TYPE__ unsigned int
 #endif
 typedef __WINT_TYPE__ wint_t;
+#endif
 #endif
 
 #ifdef _WIN64
