From 3a8ecbb3906796e6ff38b58435d51ed6cfca722c Mon Sep 17 00:00:00 2001
From: Alexander Grund <Flamefire@users.noreply.github.com>
Date: Sat, 12 Nov 2022 13:32:07 +0100
Subject: [PATCH] Fix -Wundef for `_GLIBCXX_USE_DEPRECATED` on libstdc++ >= 4.6

---
 include/boost/config/stdlib/libstdcpp3.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/config/stdlib/libstdcpp3.hpp b/include/boost/config/stdlib/libstdcpp3.hpp
index 85ad1a6b..75d33ccc 100644
--- a/include/boost/config/stdlib/libstdcpp3.hpp
+++ b/include/boost/config/stdlib/libstdcpp3.hpp
@@ -259,7 +259,7 @@ extern "C" char *gets (char *__s);
 #     if !_GLIBCXX_DEPRECATED
 #        define BOOST_NO_AUTO_PTR
 #     endif
-#  elif !_GLIBCXX_USE_DEPRECATED
+#  elif !defined(_GLIBCXX_USE_DEPRECATED) || !_GLIBCXX_USE_DEPRECATED
 #     define BOOST_NO_AUTO_PTR
 #     define BOOST_NO_CXX98_BINDERS
 #  endif