From e0a542f9604719102a7b450dc4466f15a3e5980f Mon Sep 17 00:00:00 2001
From: Simon Brand <simon@codeplay.com>
Date: Wed, 6 Jun 2018 11:24:10 +0100
Subject: [PATCH] More GCC 5.5 fixes

---
 tl/optional.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tl/optional.hpp b/tl/optional.hpp
index 1406a77..62015e4 100644
--- a/tl/optional.hpp
+++ b/tl/optional.hpp
@@ -1604,7 +1604,8 @@ template <class T> optional(T)->optional<T>;
 
 /// \exclude
 namespace detail {
-#ifdef TL_OPTIONAL_CXX14
+#if defined(TL_OPTIONAL_CXX14) && !defined(TL_OPTIONAL_GCC49) &&               \
+    !defined(TL_OPTIONAL_GCC54) && !defined(TL_OPTIONAL_GCC55)
 template <class Opt, class F,
           class Ret = decltype(detail::invoke(std::declval<F>(),
                                               *std::declval<Opt>())),