This patch adds an include needed since icu59:
Source: https://git.archlinux.org/svntogit/community.git/plain/trunk/icu59.patch?h=packages/aegisub
--- aegisub-3.2.2/src/utils.cpp	2014-12-08 02:07:09.000000000 +0200
+++ aegisub-3.2.2/src/utils.cpp	2017-04-26 11:11:15.438239182 +0300
@@ -44,6 +44,7 @@
 #include <boost/filesystem/path.hpp>
 #include <map>
 #include <unicode/locid.h>
+#include <unicode/unistr.h>
 #include <wx/clipbrd.h>
 #include <wx/filedlg.h>
 #include <wx/stdpaths.h>
ndex</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896'/><input type='hidden' name='showmsg' value='1'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896'>refs</a><a class='active' href='/guix/log/HACKING?showmsg=1'>log</a><a href='/guix/tree/HACKING?id=dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896'>tree</a><a href='/guix/commit/HACKING?id=dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896'>commit</a><a href='/guix/diff/HACKING?id=dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/HACKING'>
<input type='hidden' name='id' value='dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896'/><input type='hidden' name='showmsg' value='1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896&amp;showmsg=1'>root</a>/<a href='/guix/log/HACKING?id=dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896&amp;showmsg=1'>HACKING</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/HACKING?id=dc21d8e57ab873ef7a465dd93dcc0f8a44ff1896'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2020-10-23 12:57:20 -0400'>2020-10-23</span></td><td class='logsubject'><a href='/guix/commit/HACKING?id=73faee9fb25465f1b236f5f94e1052145655736f'>doc: Fix typo in HACKING.</a></td><td>Maxim Cournoyer</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* HACKING (Contributing): s/informations/information/.


</td></tr>
<tr class='logheader'><td><span title='2020-01-09 23:33:04 +0100'>2020-01-09</span></td><td class='logsubject'><a href='/guix/commit/HACKING?id=2d315cd428484537e763d7f7c676dc5fff7995f6'>doc: Move "Commit Access" section from 'HACKING' to the manual.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* HACKING (Commit Access): Remove.
(Contributing): Update URL of the manual.
* doc/contributing.texi (Commit Access): New section.
(Submitting Patches): Add cross reference.


</td></tr>
<tr class='logheader'><td><span title='2020-01-09 23:33:04 +0100'>2020-01-09</span></td><td class='logsubject'><a href='/guix/commit/HACKING?id=a7bde77d247ed0765f5378779d67b4668c5d7648'>doc: Add "Tracking Bugs and Patches" section.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* doc/contributing.texi (Tracking Bugs and Patches): New section.
(Submitting Patches): Refer to it.
* doc/guix.texi: Update copyright line.
* HACKING (Using emacs-debbugs): Remove.


</td></tr>
<tr class='logheader'><td><span title='2019-07-13 14:25:19 -0400'>2019-07-13</span></td><td class='logsubject'><a href='/guix/commit/HACKING?id=06e1ecbf17fee7fe513ad2808d8175fb3565ae3e'>doc: Update keyserver URL.</a></td><td>Leo Famulari</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* HACKING (Commit Access): Change keyserver URL to 'keys.openpgp.org'.


</td></tr>