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
?id=3a56a440946b79f00bd3714f912480a6a454531a'>refs</a><a class='active' href='/guix/log/tests/keys'>log</a><a href='/guix/tree/tests/keys?id=3a56a440946b79f00bd3714f912480a6a454531a'>tree</a><a href='/guix/commit/tests/keys?id=3a56a440946b79f00bd3714f912480a6a454531a'>commit</a><a href='/guix/diff/tests/keys?id=3a56a440946b79f00bd3714f912480a6a454531a'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/keys'>
<input type='hidden' name='id' value='3a56a440946b79f00bd3714f912480a6a454531a'/><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=3a56a440946b79f00bd3714f912480a6a454531a'>root</a>/<a href='/guix/log/tests?id=3a56a440946b79f00bd3714f912480a6a454531a'>tests</a>/<a href='/guix/log/tests/keys?id=3a56a440946b79f00bd3714f912480a6a454531a'>keys</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/keys?id=3a56a440946b79f00bd3714f912480a6a454531a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
wrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/antivirus.scm?id=30b36e524af4459decf84ca0011707082c00ac31&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-12-23 19:45:55 +0100'>2019-12-23</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=de73df3a085af9485e53241c062ef1356259132e'>gnu: clamav: Update to 0.102.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav): Update to 0.102.1.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-14 23:13:24 -0500'>2019-10-14</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=a7ba534ca638b00495b11ba5c8f681331c77bb14'>gnu: clamav: Update to 0.102.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav): Update to 0.102.0.
</span></span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2019-04-11 05:32:49 +0200'>2019-04-11</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=b4733a1a6f42d0814fab17e54a1eebf9e42d89e7'>gnu: clamav: Update to 0.101.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav): Update to 0.101.2.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-02-24 17:51:29 +0100'>2019-02-24</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=fcab568dea5bbf0fb8bb322fb3d27b455ea804d3'>gnu: clamav: Update to 0.101.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav): Update to 0.101.1.
[source]: Delete bundled tomsfastmath outright.
[native-inputs]: Remove bison and flex.
[inputs]: Switch to pcre2.
* gnu/packages/patches/clamav-system-tomsfastmath.patch: Update.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-01-24 21:18:11 +0100'>2019-01-24</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=6e59d91af19370fa75a681ebc34556fa677a8cbf'>gnu: clamav: Unconditionally return #T from build phase.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav)[arguments]: Use INVOKE.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-11-17 00:20:44 -0600'>2018-11-17</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=0a41123f01d5d2466d6f533be3644ac8c9a2bdf9'>gnu: Add ClamAV.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm: New file.
* gnu/packages/patches/clamav-system-tomsfastmath.patch,
gnu/packages/patches/clamav-config-llvm-libs.patch: New files.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new module.
(dist_patch_DATA): Add patches.

Co-authored-by: Christopher Baines &lt;mail@cbaines.net&gt;
</span></span></td><td>Eric Bavier</td></tr>