This test fails because it expects a MIME type "Content-Type: image/gif"
whereas that provided by libmagic is "Content-Type: image/gif; charset=binary"
Presumably the test was written against a different version.
--- aegis-4.24/test/02/t0228a-matt.sh	2008-03-14 07:19:27.000000000 +0100
+++ aegis-4.24/test/02/t0228a-matt.sh	2014-01-27 09:43:44.000000000 +0100
@@ -147,7 +147,8 @@
 SCRIPT_NAME=/cgi-bin/aeget \
 PATH_INFO=icon/rss.gif \
 QUERY_STRING= \
-$bin/aeget > rss.served.gif 2>&1
+$bin/aeget \
+| sed -e 's%^Content-Type: image/gif; charset=binary%Content-Type: image/gif%' > rss.served.gif 2>&1
 if test $? -ne 0 ; then fail; fi
 
 # Compare the expected and the actual received file.
7a'/><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=4ca2457a5c153df1088b7a9b2ec6461e6d69727a'>refs</a><a class='active' href='/guix/log/etc/time-travel-manifest.scm'>log</a><a href='/guix/tree/etc/time-travel-manifest.scm?id=4ca2457a5c153df1088b7a9b2ec6461e6d69727a'>tree</a><a href='/guix/commit/etc/time-travel-manifest.scm?id=4ca2457a5c153df1088b7a9b2ec6461e6d69727a'>commit</a><a href='/guix/diff/etc/time-travel-manifest.scm?id=4ca2457a5c153df1088b7a9b2ec6461e6d69727a'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/time-travel-manifest.scm'>
<input type='hidden' name='id' value='4ca2457a5c153df1088b7a9b2ec6461e6d69727a'/><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=4ca2457a5c153df1088b7a9b2ec6461e6d69727a'>root</a>/<a href='/guix/log/etc?id=4ca2457a5c153df1088b7a9b2ec6461e6d69727a'>etc</a>/<a href='/guix/log/etc/time-travel-manifest.scm?id=4ca2457a5c153df1088b7a9b2ec6461e6d69727a'>time-travel-manifest.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/etc/time-travel-manifest.scm?id=4ca2457a5c153df1088b7a9b2ec6461e6d69727a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-03-10 15:53:56 +0100'>2024-03-10</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=c7836393be4d134861d652b2fcf09cf4e68275ca'>time-travel-manifest: Uncomment all the past releases.</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts a4c35c607cfd7d6b0bad90cfcc46188d489e1754.

* etc/time-travel-manifest.scm (%release-commits): Uncomment all the
revisions.

Change-Id: I6abdb760cbcf06597d843cabc5fd973ee916dc77
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-09-09 19:36:05 +0200'>2023-09-09</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=a4c35c607cfd7d6b0bad90cfcc46188d489e1754'>time-travel-manifest: Comment out versions older than 1.3.0 for now.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (%release-commits): Comment out revisions
older than 1.3.0.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-09-09 19:33:31 +0200'>2023-09-09</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=d4bd5bc799e2face0b30bdb3a6ec3c347c0d1e22'>time-travel-manifest: Add 1.4.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (%release-commits): Add 1.4.0.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-08-17 15:42:56 +0200'>2022-08-17</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=845c841e21379e64a4215ee6d3d60da343e7fb93'>time-travel-manifest: Use a separate cache per system.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (&lt;guix-instance-compiler&gt;): Use a separate
cache per system so that parallel system evaluations do no step on each
other's toes.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2022-07-10 23:57:14 +0200'>2022-07-10</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=5d0437ea8ce0147b47b9df866fa2413b48f71a1a'>time-travel-manifest: Use a separate Git checkout cache.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (guix-instance-compiler): Parameterize
%REPOSITORY-CACHE-DIRECTORY.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-08 23:58:11 +0200'>2022-07-08</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=e80f0cda96181d90604c44f69094f2499036b3f6'>etc: Add 'time-travel-manifest.scm'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This manifest makes it easy to test travels from the current revision
back to the revision of a past Guix release.

Suggested by zimoun &lt;zimon.toutoune@gmail.com&gt;.

* etc/time-travel-manifest.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
</span></span></td><td>Ludovic Courtès</td></tr>