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.
b3180a78'/><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=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'>refs</a><a class='active' href='/guix/log/gnu/services/security-token.scm'>log</a><a href='/guix/tree/gnu/services/security-token.scm?id=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'>tree</a><a href='/guix/commit/gnu/services/security-token.scm?id=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'>commit</a><a href='/guix/diff/gnu/services/security-token.scm?id=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/security-token.scm'>
<input type='hidden' name='id' value='ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'/><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=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'>root</a>/<a href='/guix/log/gnu?id=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'>gnu</a>/<a href='/guix/log/gnu/services?id=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'>services</a>/<a href='/guix/log/gnu/services/security-token.scm?id=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78'>security-token.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/services/security-token.scm?id=ea18b4c5298c8cdcea22472f8cf8ce8fb3180a78&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-07-03 20:13:42 +0200'>2021-07-03</span></td><td><a href='/guix/commit/gnu/services/security-token.scm?id=e789ce538ed848bacb8f4eb5742f78b965ccf57c'>services: pcscd: Fix daemon signal handling.</a><span class='msg-avail'>...<span class='msg-tooltip'>"pcscd" wouldn't handle SIGTERM as it inherit ignoring this signal (and
others) from its parent shepherd; fork+exec-command restore signal
handling.  Fixes &lt;https://issues.guix.gnu.org/45202&gt;.

* gnu/services/security-token.scm (pcscd)[start]: Use
fork+exec-command to start "pcscd".
</span></span></td><td>Brice Waegeneire</td></tr>
<tr><td><span title='2021-06-19 23:49:18 +0200'>2021-06-19</span></td><td><a href='/guix/commit/gnu/services/security-token.scm?id=4bed8486d4c0a4ff142903b8bc1584ce84767355'>services: pcscd: Cleanup socket when started.</a><span class='msg-avail'>...<span class='msg-tooltip'>Otherwise when pcscd doesn't terminate properly (ie. receive a SIGKILL),
it won't start again because of it's socket already existing.

* gnu/services/security-token.scm (pcscd-shepherd-service)[start]:
Remove existing socket file.
</span></span></td><td>Brice Waegeneire</td></tr>
<tr><td><span title='2020-12-13 00:35:49 +0100'>2020-12-13</span></td><td><a href='/guix/commit/gnu/services/security-token.scm?id=a4cd86ff4b7a9dd4bf1a5320b8121b470e381b67'>gnu: htop: Update to 3.0.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/admin.scm (htop): Update to 3.0.3.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-12-12 23:10:05 +0100'>2020-12-12</span></td><td><a href='/guix/commit/gnu/services/security-token.scm?id=8f2656f1debffe92ea088f4c88cfe8ec560b2ba3'>services: pcscd-shepherd-service: Fix PID file location.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;http://issues.guix.gnu.org/45202&gt;.

* gnu/services/security-token.scm (pcscd-shepherd-service): Look for
pcscd.pid in /run instead of /var/run.

Reported by Raffael Stocker &lt;r.stocker@mnet-mail.de&gt;.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>