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>
ain'><a href='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='1fa3b736186f4afae1e9fee337c4dd7cb84d2630'/><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=1fa3b736186f4afae1e9fee337c4dd7cb84d2630'>refs</a><a class='active' href='/guix/log/gnu/packages/musl.scm'>log</a><a href='/guix/tree/gnu/packages/musl.scm?id=1fa3b736186f4afae1e9fee337c4dd7cb84d2630'>tree</a><a href='/guix/commit/gnu/packages/musl.scm?id=1fa3b736186f4afae1e9fee337c4dd7cb84d2630'>commit</a><a href='/guix/diff/gnu/packages/musl.scm?id=1fa3b736186f4afae1e9fee337c4dd7cb84d2630'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/musl.scm'>
<input type='hidden' name='id' value='1fa3b736186f4afae1e9fee337c4dd7cb84d2630'/><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=1fa3b736186f4afae1e9fee337c4dd7cb84d2630'>root</a>/<a href='/guix/log/gnu?id=1fa3b736186f4afae1e9fee337c4dd7cb84d2630'>gnu</a>/<a href='/guix/log/gnu/packages?id=1fa3b736186f4afae1e9fee337c4dd7cb84d2630'>packages</a>/<a href='/guix/log/gnu/packages/musl.scm?id=1fa3b736186f4afae1e9fee337c4dd7cb84d2630'>musl.scm</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/gnu/packages/musl.scm?id=1fa3b736186f4afae1e9fee337c4dd7cb84d2630&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-01-18 11:54:37 +0200'>2021-01-18</span></td><td><a href='/guix/commit/gnu/packages/musl.scm?id=973a1e52722c4453041b978100093cb35d7e67a8'>gnu: musl: Update to 1.2.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/musl.scm (musl): Update to 1.2.2.

Signed-off-by: Efraim Flashner &lt;efraim@flashner.co.il&gt;
</span></span></td><td>Vincent Legoll</td></tr>