From 4d5bb5c7bba4b7328354db7e552222dd5799583b Mon Sep 17 00:00:00 2001
From: Richard Kellnberger <Richard1.Kellnberger@web.de>
Date: Sat, 7 Oct 2023 18:10:02 +0200
Subject: [PATCH] Check existence of chrono version flag

---
 test/chrono-test.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/chrono-test.cc b/test/chrono-test.cc
index 33353ca8..c218a873 100644
--- a/test/chrono-test.cc
+++ b/test/chrono-test.cc
@@ -456,7 +456,7 @@ TEST(chrono_test, format_default) {
             fmt::format("{}", std::chrono::duration<int, std::exa>(42)));
   EXPECT_EQ("42min", fmt::format("{}", std::chrono::minutes(42)));
   EXPECT_EQ("42h", fmt::format("{}", std::chrono::hours(42)));
-#  if __cpp_lib_chrono >= 201907L
+#  if defined(__cpp_lib_chrono) && __cpp_lib_chrono >= 201907L
   EXPECT_EQ("42d", fmt::format("{}", std::chrono::days(42)));
 #  endif
   EXPECT_EQ(