From a4e4f745305cd8ec0051d99cb34cab7594d60304 Mon Sep 17 00:00:00 2001
From: Elias Kosunen <elias.kosunen@gmail.com>
Date: Mon, 7 May 2018 13:46:02 +0300
Subject: [PATCH] Fix a -Wundef when FMT_GCC_VERSION < 600

---
 include/fmt/format.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/fmt/format.h b/include/fmt/format.h
index c2ec2e5c..4996aba4 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -116,7 +116,8 @@
 #endif
 
 #if FMT_USE_USER_DEFINED_LITERALS && \
-    (FMT_GCC_VERSION >= 600 || FMT_CLANG_VERSION >= 304)
+    (FMT_GCC_VERSION >= 600 || \
+    (defined(FMT_CLANG_VERSION) && FMT_CLANG_VERSION >= 304))
 # define FMT_UDL_TEMPLATE 1
 #else
 # define FMT_UDL_TEMPLATE 0