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.
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>
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<div class='path'>path: <a href='/guix/log/?id=c1942727cfc37a14b732c1903b379250e721f447'>root</a>/<a href='/guix/log/tests?id=c1942727cfc37a14b732c1903b379250e721f447'>tests</a>/<a href='/guix/log/tests/records.scm?id=c1942727cfc37a14b732c1903b379250e721f447'>records.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/tests/records.scm?id=c1942727cfc37a14b732c1903b379250e721f447&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-04-29 01:22:04 +0200'>2021-04-29</span></td><td><a href='/guix/commit/tests/records.scm?id=524c9800afb433cc474132185d8e37f72004adb3'>diagnostics, ui: Adjust to 'read-error' and 'syntax-error' in Guile 3.0.6.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/diagnostics.scm (source-properties-&gt;location): Add clause for
vectors.
* guix/ui.scm (report-load-error): Tweak 'read-error' handling for 3.0.6.
* tests/guix-package.sh: Relax regexp for the "unbound variable"
diagnostic check.
* tests/guix-system.sh: Adjust "missing closing paren" check for 3.0.6.
* tests/records.scm (location-alist): New procedure.
("define-record-type* &amp; wrong field specifier")
("define-record-type* &amp; wrong field specifier, identifier")
("define-record-type* &amp; duplicate initializers"): Use it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-16 18:30:57 +0100'>2020-01-16</span></td><td><a href='/guix/commit/tests/records.scm?id=47212fc763788660ff9051ccee1f6fa8a0db7bdd'>records: Improve reporting of "invalid field specifier" errors.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously users would just see:

  error: invalid field specifier

without source location or hints.

* guix/records.scm (expand): Add optional 'parent-form' parameter and
pass it to 'syntax-violation' when it is true.
(make-syntactic-constructor): Pass S as a third argument to
'report-invalid-field-specifier'.
* guix/ui.scm (report-load-error): For 'syntax-error', show SUBFORM or
FORM in the message.
* tests/records.scm ("define-record-type* &amp; wrong field specifier"): Add
a 'subform' parameter and adjust test accordingly.
("define-record-type* &amp; wrong field specifier, identifier"): New test.
* tests/guix-system.sh: Add test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-30 11:08:39 +0100'>2019-03-30</span></td><td><a href='/guix/commit/tests/records.scm?id=d2be7e3c4ba8d6d0dde9b4c0bff623ab85637424'>records: Support custom 'this' identifiers.</a><span class='msg-avail'>...<span class='msg-tooltip'>This lets record users choose an identifier other than 'this-record'.

* guix/records.scm (make-syntactic-constructor): Add #:this-identifier.
[wrap-field-value]: Honor it.
(define-record-type*): Add form with extra THIS-IDENTIFIER and honor
it.
* tests/records.scm ("define-record-type* &amp; thunked &amp; inherit &amp; custom this"):
New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-25 23:37:06 +0100'>2019-03-25</span></td><td><a href='/guix/commit/tests/records.scm?id=abd4d6b33dba4de228e90ad15a8efb456fcf7b6e'>records: Allow thunked fields to refer to 'this-record'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/records.scm (this-record): New syntax parameter.
(make-syntactic-constructor)[wrap-field-value]: When F is thunked,
return a one-argument lambda instead of a thunk, and parameterize
THIS-RECORD.
(define-record-type*)[thunked-field-accessor-definition]: Pass X
to (real-get X).
* tests/records.scm ("define-record-type* &amp; thunked &amp; this-record")
("define-record-type* &amp; thunked &amp; default &amp; this-record")
("define-record-type* &amp; thunked &amp; inherit &amp; this-record"): New tests.
</span></span></td><td>Ludovic Courtès</td></tr>