From 9a08fb52bf1224b33579dea75f2071cbe4fd118f Mon Sep 17 00:00:00 2001
From: vitaut <victor.zverovich@gmail.com>
Date: Tue, 24 Nov 2015 09:13:48 -0800
Subject: [PATCH] Fix compilation with clang and old libstdc++

---
 format.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/format.h b/format.h
index 09007a45..8316d918 100644
--- a/format.h
+++ b/format.h
@@ -207,7 +207,7 @@ inline uint32_t clzll(uint64_t x) {
 // makes the fmt::literals implementation easier. However, an explicit check
 // for variadic templates is added here just in case.
 # define FMT_USE_USER_DEFINED_LITERALS \
-   FMT_USE_VARIADIC_TEMPLATES && \
+   FMT_USE_VARIADIC_TEMPLATES && FMT_USE_RVALUE_REFERENCES && \
    (FMT_HAS_FEATURE(cxx_user_literals) || \
        (FMT_GCC_VERSION >= 407 && FMT_HAS_GXX_CXX11) || _MSC_VER >= 1900)
 #endif