Index: mutex.inl
===================================================================
RCS file: /cvsroot/boost/boost/libs/thread/src/mutex.inl,v
retrieving revision 1.5.10.4
diff -u -r1.5.10.4 mutex.inl
--- mutex.inl	22 Dec 2006 10:38:23 -0000	1.5.10.4
+++ mutex.inl	29 May 2007 10:33:31 -0000
@@ -24,7 +24,15 @@
         version_info.dwMajorVersion >= 4)
     {
         if (HMODULE kernel_module = GetModuleHandle(TEXT("KERNEL32.DLL")))
-            g_TryEnterCriticalSection = reinterpret_cast<TryEnterCriticalSection_type>(GetProcAddress(kernel_module, TEXT("TryEnterCriticalSection")));
+        {
+            g_TryEnterCriticalSection = reinterpret_cast<TryEnterCriticalSection_type>(
+#if defined(BOOST_NO_ANSI_APIS)
+                GetProcAddressW(kernel_module, L"TryEnterCriticalSection")
+#else
+                GetProcAddress(kernel_module, "TryEnterCriticalSection")
+#endif        
+                );
+        }
     }
 }