Source: https://git.archlinux.org/svntogit/community.git/plain/trunk/boost-1.68.patch?h=packages/aegisub
From d8336d2fed73c72d1227b343d6acfb991bc1651b Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Mon, 9 Jul 2018 20:15:29 +0000
Subject: [PATCH] Keep using std::distance after Boost 1.68

src/search_replace_engine.cpp:256:14: error: call to
      'distance' is ambiguous
                                count += distance(
                                         ^~~~~~~~
/usr/include/c++/v1/iterator:511:1: note: candidate function [with _InputIter =
      boost::u32regex_iterator<std::__1::__wrap_iter<const char *> >]
distance(_InputIter __first, _InputIter __last)
^
/usr/local/include/boost/iterator/distance.hpp:49:9: note: candidate function [with SinglePassIterator =
      boost::u32regex_iterator<std::__1::__wrap_iter<const char *> >]
        distance(SinglePassIterator first, SinglePassIterator last)
        ^
---
 src/search_replace_engine.cpp | </td></tr></table>
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