diff -Naur ACE_wrappers_orig/ace/OS_NS_stdio.inl ACE_wrappers/ace/OS_NS_stdio.inl
--- ACE_wrappers_orig/ace/OS_NS_stdio.inl	Thu Jan  8 11:08:20 2009
+++ ACE_wrappers/ace/OS_NS_stdio.inl	Wed Mar 11 11:33:26 2009
@@ -962,7 +962,7 @@
 ACE_INLINE int
 ACE_OS::vsprintf (wchar_t *buffer, const wchar_t *format, va_list argptr)
 {
-# if (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500) || \
+# if (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500 && !defined ACE_WIN32) || \
      (defined (sun) && !(defined(_XOPEN_SOURCE) && (_XOPEN_VERSION-0==4))) || \
      (defined (ACE_HAS_DINKUM_STL) || defined (__DMC__))

@@ -993,7 +993,7 @@
 ACE_INLINE int
 ACE_OS::vsnprintf (wchar_t *buffer, size_t maxlen, const wchar_t *format, va_list ap)
 {
-# if (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500) || \
+# if (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500 && !defined ACE_WIN32) || \
      (defined (sun) && !(defined(_XOPEN_SOURCE) && (_XOPEN_VERSION-0==4))) || \
      (defined (ACE_HAS_DINKUM_STL) || defined (__DMC__))