From ff3e6c7248a0bfb1d44e72fd0f822320178263bc Mon Sep 17 00:00:00 2001
From: gabime <gmelman1@gmail.com>
Date: Fri, 8 Nov 2019 14:08:31 +0200
Subject: [PATCH] Fix issue #1306

---
 include/spdlog/details/os-inl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/spdlog/details/os-inl.h b/include/spdlog/details/os-inl.h
index 3ec87da9..15e7f2df 100644
--- a/include/spdlog/details/os-inl.h
+++ b/include/spdlog/details/os-inl.h
@@ -277,7 +277,7 @@ SPDLOG_INLINE int utc_minutes_offset(const std::tm &tm)
     return offset;
 #else
 
-#if defined(sun) || defined(__sun) || defined(_AIX)
+#if defined(sun) || defined(__sun) || defined(_AIX) || (!defined(_BSD_SOURCE) && !defined(_GNU_SOURCE))
     // 'tm_gmtoff' field is BSD extension and it's missing on SunOS/Solaris
     struct helper
     {