Patch derived from discussion at https://savannah.nongnu.org/bugs/?37503

--- texi2html-5.0/texi2html.pl	2010-06-30 17:01:27.000000000 -0500
+++ texi2html-5.0/texi2html.pl	2014-07-09 01:17:57.062990582 -0500
@@ -2589,7 +2589,12 @@
     my $state = shift;
 
     # FIXME this should be done only once, for @documentencoding
-    my $encoding = lc(Texi2HTML::Config::get_conf('DOCUMENT_ENCODING'));
+    my $encoding;
+    my $input_encoding = Texi2HTML::Config::get_conf('documentencoding');
+    if (defined($input_encoding))
+    {
+      $encoding = lc($input_encoding);
+    }
     if (defined($encoding) and $encoding ne '' and exists($Texi2HTML::Config::t2h_encoding_aliases{$encoding}))
     {
        $encoding = $Texi2HTML::Config::t2h_encoding_aliases{$encoding};

Fix failures in test/encodings.

--- texi2html-5.0/texi2html.pl	2014-07-09 01:22:06.000000000 -0500
+++ texi2html-5.0/texi2html.pl	2014-07-10 23:23:47.182097602 -0500
@@ -53,6 +53,7 @@
 # for translations
 #use encoding 'utf8';
 #use utf8;
+binmode STDERR, ':encoding(utf8)';
 
 #
 # According to
ref='/guix/refs/?id=690a347bdbb3912040a996c64851396f5922e4e7'>refs</a><a class='active' href='/guix/log/gnu/tests/mail.scm'>log</a><a href='/guix/tree/gnu/tests/mail.scm?id=690a347bdbb3912040a996c64851396f5922e4e7'>tree</a><a href='/guix/commit/gnu/tests/mail.scm?id=690a347bdbb3912040a996c64851396f5922e4e7'>commit</a><a href='/guix/diff/gnu/tests/mail.scm?id=690a347bdbb3912040a996c64851396f5922e4e7'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/tests/mail.scm'>
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<tr><td><span title='2023-12-14 23:12:24 +0100'>2023-12-14</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=b681e339fa37f2a26763458ee56b31af1d6a7ec5'>services: Add rspamd-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/mail.scm (rspamd-service-type): New variable.
* gnu/tests/mail.scm (%test-rspamd): New variable.
* doc/guix.texi: Document it.

Co-authored-by: Saku Laesvuori &lt;saku@laesvuori.fi&gt;
Change-Id: I7196643f087ffe9fc91aab231b69d5ed8dc9d198
Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Thomas Ieong</td></tr>
<tr><td><span title='2023-05-06 17:12:45 +0200'>2023-05-06</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=f51888272558d98cf5c196b93fb6c499056fbf6c'>tests: Add missing module imports for marionette-evaluated code.</a><span class='msg-avail'>...<span class='msg-tooltip'>This missing imports became apparent with commit
a09c7da8f8d8e732f969cf0a09aaa78f87032ab1, which runs the marionette
service in a fresh Guile process with fewer imports.

* gnu/tests/databases.scm (run-postgresql-test, run-timescaledb-test)
(run-mysql-test): Add missing module imports for code passed to
'marionette-eval'.
* gnu/tests/docker.scm (run-docker-test, run-docker-system-test): Likewise.
* gnu/tests/mail.scm (run-dovecot-test, run-getmail-test): Likewise.
* gnu/tests/monitoring.scm (run-zabbix-server-test): Likewise.
* gnu/tests/pam.scm (run-test-pam-limits): Likewise.
* gnu/tests/reconfigure.scm (run-switch-to-system-test)
(run-install-bootloader-test): Likewise.
* gnu/tests/security-token.scm (run-pcscd-test): Likewise.
* gnu/tests/install.scm (gui-test-program): Likewise.
* gnu/tests/telephony.scm (run-jami-test): Add modules to
the #:imported-modules argument of 'marionette-operating-system'.
[test]: Remove them from 'with-imported-modules'; remove
'with-extensions'.  Add "d-bus tooling loaded" test to set up %load-path
and %load-compiled-path so the marionette process can find
guile-ac-d-bus and guile-packrat.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-03-03 17:55:34 +0100'>2023-03-03</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=c6cbce9ad8ee5fa7b51d8abea83ddc3dd07fa3c6'>services: mail: Deprecate 'dovecot-service' procedure.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/guix.texi (Mail Services): Replace 'dovecot-service' with 'dovecot-service-type'.
* gnu/services/mail.scm (dovecot-service-type): Set default value.
(dovecot-service): Deprecate procedure.
* gnu/tests/mail.scm (%dovecot-os): Use dovecot-service-type.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Bruno Victal</td></tr>