From be4901ce2c64c04f71ebc02cd2cc6d3e8cd6d315 Mon Sep 17 00:00:00 2001
From: Martchus <martchus@gmx.net>
Date: Wed, 31 May 2017 00:30:26 +0200
Subject: [PATCH] Add missing #include <function>

This fixes compilation using libc++ instead
of libstdc++
---
 chrono/timespan.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/chrono/timespan.h b/chrono/timespan.h
index ab10e4a..6e799e5 100644
--- a/chrono/timespan.h
+++ b/chrono/timespan.h
@@ -4,6 +4,7 @@
 #include "../conversion/types.h"
 #include "../global.h"
 
+#include <functional>
 #include <limits>
 #include <string>