From 7beb5199800795f3a4e4e656c8c59573296c9c33 Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Sat, 27 Jan 2018 18:31:28 +0000
Subject: [PATCH] GCC-5.x also needs workaround for std::pair issue

---
 include/boost/type_traits/is_default_constructible.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/boost/type_traits/is_default_constructible.hpp b/include/boost/type_traits/is_default_constructible.hpp
index 99c911f..b463748 100644
--- a/include/boost/type_traits/is_default_constructible.hpp
+++ b/include/boost/type_traits/is_default_constructible.hpp
@@ -16,7 +16,7 @@
 #if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
 #include <boost/type_traits/is_abstract.hpp>
 #endif
-#ifdef  __clang__
+#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ == 5))
 #include <utility> // std::pair
 #endif
 
@@ -58,7 +58,7 @@ namespace boost{
    template <class T, std::size_t N> struct is_default_constructible<T[N]> : public is_default_constructible<T>{};
    template <class T> struct is_default_constructible<T[]> : public is_default_constructible<T>{};
    template <class T> struct is_default_constructible<T&> : public integral_constant<bool, false>{};
-#ifdef  __clang__
+#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ == 5))
    template <class T, class U> struct is_default_constructible<std::pair<T,U> > : public integral_constant<bool, is_default_constructible<T>::value && is_default_constructible<U>::value>{};
 #endif
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)