From e4ef5de16f9333c7ea5d5d0ecfa3ee9816b462a9 Mon Sep 17 00:00:00 2001
From: Marcel Raad <MarcelRaad@users.noreply.github.com>
Date: Thu, 18 Feb 2016 11:51:36 +0100
Subject: [PATCH] Add missing include for mpl::if_

This caused compile breaks when building Boost.Serialization.
---
 .../boost/spirit/home/classic/core/non_terminal/impl/rule.ipp    | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/boost/spirit/home/classic/core/non_terminal/impl/rule.ipp b/include/boost/spirit/home/classic/core/non_terminal/impl/rule.ipp
index 9f10306f7c..137694ef2f 100644
--- a/include/boost/spirit/home/classic/core/non_terminal/impl/rule.ipp
+++ b/include/boost/spirit/home/classic/core/non_terminal/impl/rule.ipp
@@ -24,6 +24,7 @@
 #include <boost/spirit/home/classic/core/non_terminal/parser_context.hpp>
 #include <boost/spirit/home/classic/core/non_terminal/parser_id.hpp>
 #include <boost/type_traits/is_base_and_derived.hpp>
+#include <boost/mpl/if.hpp>
 
 ///////////////////////////////////////////////////////////////////////////////
 namespace boost { namespace spirit {