From 35e819c71b5e730375c226c9e12b5ee016d5fb15 Mon Sep 17 00:00:00 2001
From: "Ralf W. Grosse-Kunstleve" <rwgk@google.com>
Date: Wed, 28 Jul 2021 05:07:58 -0700
Subject: [PATCH] Accommodating environments that define __STDC_WANT_LIB_EXT1__
 even if __STDC_LIB_EXT1__ is not defined by the implementation.

Follow-on to PR #3129.
---
 include/pybind11/chrono.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/pybind11/chrono.h b/include/pybind11/chrono.h
index c4e81f5720..61bbcbc540 100644
--- a/include/pybind11/chrono.h
+++ b/include/pybind11/chrono.h
@@ -101,7 +101,7 @@ template <typename type> class duration_caster {
 };
 
 inline std::tm *localtime_thread_safe(const std::time_t *time, std::tm *buf) {
-#if defined(__STDC_WANT_LIB_EXT1__) || defined(_MSC_VER)
+#if (defined(__STDC_LIB_EXT1__) && defined(__STDC_WANT_LIB_EXT1__)) || defined(_MSC_VER)
     if (localtime_s(buf, time))
         return nullptr;
     return buf;