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>
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<tr><td><span title='2017-08-20 11:30:43 +0200'>2017-08-20</span></td><td><a href='/guix/commit/gnu/packages/gobby.scm?id=50631fe933037977cf54140d0cd473cea9ea1994'>gnu: gobby: Re-add Gobby 0.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gobby.scm (gobby-0.4): New variable.
</span></span></td><td>Andy Wingo</td></tr>
<tr><td><span title='2017-08-20 10:52:56 +0530'>2017-08-20</span></td><td><a href='/guix/commit/gnu/packages/gobby.scm?id=97291c0c7c6bc50aa503f9bf7f9abd97cffae9c9'>gnu: gobby: Update to 0.5.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gobby.scm (gobby): Update to 0.5.0.
[inputs]: Remove libnet6 and obby. Add libinfinity. Sort.
[arguments]: Add move-executable phase.
</span></span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2017-08-20 10:52:55 +0530'>2017-08-20</span></td><td><a href='/guix/commit/gnu/packages/gobby.scm?id=6a84ec8eb3e58f22e2961016722ae01e464cb8f4'>gnu: Add libinfinity.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gobby.scm (libinfinity): New variable.
</span></span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2016-09-27 14:46:10 +0200'>2016-09-27</span></td><td><a href='/guix/commit/gnu/packages/gobby.scm?id=e9070933bfe23412fce21237c51c6d2d86cb8681'>gnu: Add gobby.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gobby.scm (gobby): New variable.
</span></span></td><td>Andy Wingo</td></tr>
<tr><td><span title='2016-09-27 14:46:10 +0200'>2016-09-27</span></td><td><a href='/guix/commit/gnu/packages/gobby.scm?id=22a3cff3c81d58c9d7d80c8beebec680ee90d9c3'>gnu: Add obby.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gobby.scm (obby): New variable.
</span></span></td><td>Andy Wingo</td></tr>
<tr><td><span title='2016-09-27 14:46:10 +0200'>2016-09-27</span></td><td><a href='/guix/commit/gnu/packages/gobby.scm?id=c8105e811b1f3a1f01d6942bd9ddeb8004ce30f3'>gnu: Add libnet6.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gobby.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new file.
</span></span></td><td>Andy Wingo</td></tr>