commit eba78977c58f54f2ee0c65ab7dfdf64a53b715cd
Author: Jacek Caban <jacek@codeweavers.com>
Date:   Fri Oct 31 15:01:27 2014 +0100

    winnt.h: Added UNW_* flags for amd64.

diff --git a/mingw-w64-headers/include/winnt.h b/mingw-w64-headers/include/winnt.h
index a20c884..b703125 100644
--- a/mingw-w64-headers/include/winnt.h
+++ b/mingw-w64-headers/include/winnt.h
@@ -1746,6 +1746,12 @@ extern "C" {
   typedef DWORD (*POUT_OF_PROCESS_FUNCTION_TABLE_CALLBACK)(HANDLE Process,PVOID TableAddress,PDWORD Entries,PRUNTIME_FUNCTION *Functions);
 
 #define OUT_OF_PROCESS_FUNCTION_TABLE_CALLBACK_EXPORT_NAME "OutOfProcessFunctionTableCallback"
+
+#define UNW_FLAG_NHANDLER   0x00
+#define UNW_FLAG_EHANDLER   0x01
+#define UNW_FLAG_UHANDLER   0x02
+#define UNW_FLAG_CHAININFO  0x04
+
 #endif /* end of _AMD64_ */
 
 
