From 9279001b8cb0f4f9ef2a8e95d929c27048f7a44e Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Fri, 22 Apr 2022 16:49:03 +0300
Subject: [PATCH] Check BOOST_NO_CXX11_HDR_MUTEX when enabling <system_error>
 integration

---
 include/boost/system/detail/config.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/system/detail/config.hpp b/include/boost/system/detail/config.hpp
index 26e0a4c..ad958bc 100644
--- a/include/boost/system/detail/config.hpp
+++ b/include/boost/system/detail/config.hpp
@@ -13,7 +13,7 @@
 
 // BOOST_SYSTEM_HAS_SYSTEM_ERROR
 
-#if !defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR) && !defined(BOOST_NO_CXX11_HDR_ATOMIC)
+#if !defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR) && !defined(BOOST_NO_CXX11_HDR_ATOMIC) && !defined(BOOST_NO_CXX11_HDR_MUTEX)
 # define BOOST_SYSTEM_HAS_SYSTEM_ERROR
 #endif