From 041678752bf455d7b2e19d75a667280972ad8057 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@pdimov.com>
Date: Mon, 17 Sep 2018 02:55:40 +0300
Subject: [PATCH] Revert deletion of BOOST_*_API check

---
 include/boost/system/error_code.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/boost/system/error_code.hpp b/include/boost/system/error_code.hpp
index a859deb..7729049 100644
--- a/include/boost/system/error_code.hpp
+++ b/include/boost/system/error_code.hpp
@@ -27,6 +27,10 @@
 # include <system_error>
 #endif
 
+#if !defined(BOOST_POSIX_API) && !defined(BOOST_WINDOWS_API)
+#  error BOOST_POSIX_API or BOOST_WINDOWS_API must be defined
+#endif
+
 namespace boost
 {