From d4f875782c096c2900c8a0489ecbb4372da80340 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Loriot?= <sebastien.loriot@cgal.org>
Date: Tue, 30 Dec 2014 10:13:56 +0100
Subject: [PATCH] use boost::tuple if using clang and libc++

---
 STL_Extension/include/CGAL/tuple.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/STL_Extension/include/CGAL/tuple.h b/STL_Extension/include/CGAL/tuple.h
index b8c67fd2f7e..300cc06a5ec 100644
--- a/STL_Extension/include/CGAL/tuple.h
+++ b/STL_Extension/include/CGAL/tuple.h
@@ -25,6 +25,15 @@
 
 #include <CGAL/config.h>
 
+// workaround issue in the tuple implementation of libc++
+// by falling back onto boost's
+#ifndef CGAL_CFG_NO_CPP0X_TUPLE
+  #include <cstddef>
+  #if defined( _LIBCPP_VERSION ) // check if libc++ is used
+    #define CGAL_CFG_NO_CPP0X_TUPLE
+  #endif
+#endif
+
 #ifndef CGAL_CFG_NO_CPP0X_TUPLE
 #  include <tuple>
 #else