Version 3.5.11 added a test to check that the default trust store is readable.
It does not exist in the build environment, so pretend everything is fine.

diff a/tests/trust-store.c b/tests/trust-store.c
--- a/tests/trust-store.c
+++ b/tests/trust-store.c
@@ -61,7 +61,7 @@
 	} else if (ret < 0) {
 		fail("error loading system trust store: %s\n", gnutls_strerror(ret));
 	} else if (ret == 0) {
-		fail("no certificates were found in system trust store!\n");
+		success("no trust store in the Guix build environment!\n");
 	}
 
 	gnutls_certificate_free_credentials(x509_cred);
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<div class='path'>path: <a href='/guix/log/?id=2564b7bcff739d5c395fe6b03d4a15c672c61e3e'>root</a>/<a href='/guix/log/gnu?id=2564b7bcff739d5c395fe6b03d4a15c672c61e3e'>gnu</a>/<a href='/guix/log/gnu/tests?id=2564b7bcff739d5c395fe6b03d4a15c672c61e3e'>tests</a>/<a href='/guix/log/gnu/tests/vnc.scm?id=2564b7bcff739d5c395fe6b03d4a15c672c61e3e'>vnc.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/tests/vnc.scm?id=2564b7bcff739d5c395fe6b03d4a15c672c61e3e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-10-07 15:08:05 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/tests/vnc.scm?id=0169aee33e154c1fa8b299c7f126f3e94a8dc9a4'>tests: xvnc: Do not use specification-&gt;package in OS definition.</a><span class='msg-avail'>...<span class='msg-tooltip'>Doing so would cause the extra package dependencies to not be
correctly registered as dependencies, which would lead to a silent
failure when attempting to load or byte compile the module at the time
guix build itself (e.g., when running 'guix pull').

* gnu/tests/vnc.scm (%xvnc-os) [packages]: Turn the the
specification-&gt;package declaration into a list of package objects.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 15:07:48 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/tests/vnc.scm?id=00e843050012961e9cc41b003ea9271eab718541'>Revert "Revert "services: Add xvnc-service-type.""</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 0c4966160054bc50e6ab3a4ac9c9a6a1826ab5a0.  The fix appears
in the subsequent commit, for clarity.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 12:53:22 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/tests/vnc.scm?id=0c4966160054bc50e6ab3a4ac9c9a6a1826ab5a0'>Revert "services: Add xvnc-service-type."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 1c528a95cb92b7808e6603d7956185005583629f.  This broke
'guix pull', for (yet) unknown reasons.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 10:11:13 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/tests/vnc.scm?id=1c528a95cb92b7808e6603d7956185005583629f'>services: Add xvnc-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/vnc.scm: New file.
* gnu/tests/vnc.scm: Likewise.
* gnu/local.mk: Register them.
</span></span></td><td>Maxim Cournoyer</td></tr>