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>
s='main'><a href='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='d52d2d623a73c71c4b5c629839605f1a355d9a7c'/><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=d52d2d623a73c71c4b5c629839605f1a355d9a7c'>refs</a><a class='active' href='/guix/log/gnu/packages/mcrypt.scm'>log</a><a href='/guix/tree/gnu/packages/mcrypt.scm?id=d52d2d623a73c71c4b5c629839605f1a355d9a7c'>tree</a><a href='/guix/commit/gnu/packages/mcrypt.scm?id=d52d2d623a73c71c4b5c629839605f1a355d9a7c'>commit</a><a href='/guix/diff/gnu/packages/mcrypt.scm?id=d52d2d623a73c71c4b5c629839605f1a355d9a7c'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/mcrypt.scm'>
<input type='hidden' name='id' value='d52d2d623a73c71c4b5c629839605f1a355d9a7c'/><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=d52d2d623a73c71c4b5c629839605f1a355d9a7c'>root</a>/<a href='/guix/log/gnu?id=d52d2d623a73c71c4b5c629839605f1a355d9a7c'>gnu</a>/<a href='/guix/log/gnu/packages?id=d52d2d623a73c71c4b5c629839605f1a355d9a7c'>packages</a>/<a href='/guix/log/gnu/packages/mcrypt.scm?id=d52d2d623a73c71c4b5c629839605f1a355d9a7c'>mcrypt.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/mcrypt.scm?id=d52d2d623a73c71c4b5c629839605f1a355d9a7c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2016-07-21 18:09:40 -0400'>2016-07-21</span></td><td><a href='/guix/commit/gnu/packages/mcrypt.scm?id=de67e922885baf68a746a0484ca0b45e45b0964b'>gnu: Update URLs for sourceforge.net.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-05-30 21:57:36 +0300'>2016-05-30</span></td><td><a href='/guix/commit/gnu/packages/mcrypt.scm?id=fd1461879c63c608617d30524183a71370a7451c'>gnu: mcrypt: Fix CVE-2012-4409, CVE-2012-4426, CVE-2012-4527.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2016-04-14 10:38:21 +0300'>2016-04-14</span></td><td><a href='/guix/commit/gnu/packages/mcrypt.scm?id=fc1adab1487e5ea3c5f6341263df14414ba4e784'>gnu: packages: Use 'search-patches' everywhere.</a><span class='msg-avail'>...</span></td><td>Alex Kost</td></tr>