From 2cbaa3a7dbb25fc7e5a6db5447ea0f2ca43796e3 Mon Sep 17 00:00:00 2001
From: Vasily Titskiy <vasilyt@amayasoftware.com>
Date: Wed, 29 Mar 2017 11:43:28 -0400
Subject: [PATCH] Fix 'WinSock.h has already been included' compiler error.

Fix compiler error if Boost.Asio & msgpack are used together on Windows
Platform
---
 include/msgpack/sysdep.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/msgpack/sysdep.h b/include/msgpack/sysdep.h
index 62026530..e8c0d9a8 100644
--- a/include/msgpack/sysdep.h
+++ b/include/msgpack/sysdep.h
@@ -45,6 +45,9 @@
 
 #ifdef _WIN32
 #   define _msgpack_atomic_counter_header <windows.h>
+#   if !defined(WIN32_LEAN_AND_MEAN)
+#       define WIN32_LEAN_AND_MEAN
+#   endif /* WIN32_LEAN_AND_MEAN */
     typedef long _msgpack_atomic_counter_t;
 #   define _msgpack_sync_decr_and_fetch(ptr) InterlockedDecrement(ptr)
 #   define _msgpack_sync_incr_and_fetch(ptr) InterlockedIncrement(ptr)