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>
</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='dd05a93743bef6bb946d03cd0c665e3b1d62a116'/><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>
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<div class='path'>path: <a href='/guix/log/?id=dd05a93743bef6bb946d03cd0c665e3b1d62a116'>root</a>/<a href='/guix/log/.gitignore?id=dd05a93743bef6bb946d03cd0c665e3b1d62a116'>.gitignore</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/.gitignore?id=dd05a93743bef6bb946d03cd0c665e3b1d62a116&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-04-24 15:02:57 -0400'>2021-04-24</span></td><td><a href='/guix/commit/.gitignore?id=20fd0e485f22ee009c89829920861b750f794990'>.gitignore: Adjust the glob pattern for the "doc/stamp" files.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .gitignore: Ignore 'doc/stamp-N' files with numbers greater than 9.

Signed-off-by: Leo Famulari &lt;leo@famulari.name&gt;
</span></span></td><td>B. Wilson</td></tr>
<tr><td><span title='2020-10-20 19:16:21 +0200'>2020-10-20</span></td><td><a href='/guix/commit/.gitignore?id=e6994bff2ef461a2860e4207095746a5565cbf0e'>gitignore: Ignore generated guile binary and intermediate products.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .gitignore: Ignore guile, guile-guile-launcher.o, .deps and .dirstamp.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-09-17 14:10:42 +0200'>2020-09-17</span></td><td><a href='/guix/commit/.gitignore?id=cabac732deffafc796537658a6c33c6c4aec821e'>guix-install.sh: Support OpenRC.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-install.sh (chk_init_sys): Detect OpenRC.
(sys_enable_guix_daemon): Install &amp; enable the Guix daemon on such
systems.
* etc/openrc/guix-daemon.in: New file.
* nix/local.mk: Add a rule for it.
(openrcservicedir, nodist_openrcservice_DATA): New variables.
(CLEANFILES, EXTRA_DIST): Add them.
* .gitignore: Ignore etc/openrc/guix-daemon.

Signed-off-by: Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;
</span></span></td><td>Morgan Smith</td></tr>
<tr><td><span title='2020-07-17 15:23:53 +0200'>2020-07-17</span></td><td><a href='/guix/commit/.gitignore?id=d6b05ba3534b030f8de976e340c19ac8a4118ff4'>gitignore: Don't ignore daemon source code.</a><span class='msg-avail'>...<span class='msg-tooltip'>Remove files that are included in the repository from .gitignore. This
improves the behavior of some code-searching tools.
</span></span></td><td>Jakub Kądziołka</td></tr>
<tr><td><span title='2020-06-28 13:28:25 +0200'>2020-06-28</span></td><td><a href='/guix/commit/.gitignore?id=b9edefbc46da76fea6d56e08462618a398192189'>.gitignore: Ignore 'etc/committer.scm'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .gitignore: Add '/etc/committer.scm'.
</span></span></td><td>Brice Waegeneire</td></tr>