Patch taken from Gentoo:

From 58d30be41daa34f565ab38ab7d92c64fe92acf5d Mon Sep 17 00:00:00 2001
From: Karl Linden <karl.j.linden@gmail.com>
Date: Mon, 4 Sep 2017 20:45:35 +0200
Subject: net-libs/libtorrent-rasterbar: fix compilation with boost-1.65.0

* Apply upstream patch from commit 7eb3cf5.

Closes: https://bugs.gentoo.org/show_bug.cgi?id=629802
Package-Manager: Portage-2.3.8, Repoman-2.3.3
Closes: https://github.com/gentoo/gentoo/pull/5615
commit 7eb3cf6bc6dbada3fa7bb7ff4d5981182813a0e2
Author: arvidn <arvid@cs.umu.se>
Date:   Tue Jul 11 23:16:50 2017 -0700

    use the official boost.config header

diff --git a/include/libtorrent/export.hpp b/include/libtorrent/export.hpp
index 87536af2a..503afe27a 100644
--- a/include/libtorrent/export.hpp
+++ b/include/libtorrent/export.hpp
@@ -33,19 +33,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #ifndef TORRENT_EXPORT_HPP_INCLUDED
 #define TORRENT_EXPORT_HPP_INCLUDED
 
-#if !defined(BOOST_COMPILER_CONFIG) && !defined(BOOST_NO_COMPILER_CONFIG)
-#  include <boost/config/select_compiler_config.hpp>
-#endif
-#ifdef BOOST_COMPILER_CONFIG
-#  include BOOST_COMPILER_CONFIG
-#endif
-
-#if !defined(BOOST_PLATFORM_CONFIG) && !defined(BOOST_NO_PLATFORM_CONFIG)
-#  include <boost/config/select_platform_config.hpp>
-#endif
-#ifdef BOOST_PLATFORM_CONFIG
-#  include BOOST_PLATFORM_CONFIG
-#endif
+#include <boost/config.hpp>
 
 // backwards compatibility with older versions of boost
 #if !defined BOOST_SYMBOL_EXPORT && !defined BOOST_SYMBOL_IMPORT