diff -rupN ACE_wrappers_original/ace/os_include/sys/os_types.h ACE_wrappers/ace/os_include/sys/os_types.h
--- ACE_wrappers_original/ace/os_include/sys/os_types.h	Fri Feb  6 09:16:28 2009
+++ ACE_wrappers/ace/os_include/sys/os_types.h	Wed Jan 21 16:25:24 2009
@@ -137,7 +137,7 @@ typedef double ACE_timer_t;
   typedef long suseconds_t;
 #endif

-#if defined (ACE_LACKS_USECONDS_T)
+#if defined (ACE_LACKS_USECONDS_T) && !defined(__MINGW32__)
   typedef unsigned long useconds_t;
 #endif