1 files changed, 4 insertions, 0 deletions
diff --git a/pthread.h b/pthread.h
index e5a3a3e..21f4be9 100644
--- a/pthread.h
+++ b/pthread.h
@@ -942,8 +942,12 @@ int pthreadCancelableTimedWait (HANDLE waitHandle, DWORD timeout);
  * Thread-Safe C Runtime Library Mappings.
  */
 #if (! defined(NEED_ERRNO)) || (! defined( _REENTRANT ) && (! defined( _MT ) || ! defined( _MD )))
+#if defined(PTW32_BUILD)
+__declspec( dllexport ) int * _errno( void );
+#else
 int * _errno( void );
 #endif
+#endif
 
 /*
  * WIN32 C runtime library had been made thread-safe