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
>summary</a><a href='/guix/refs/?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b'>refs</a><a class='active' href='/guix/log/gnu/packages/smalltalk.scm'>log</a><a href='/guix/tree/gnu/packages/smalltalk.scm?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b'>tree</a><a href='/guix/commit/gnu/packages/smalltalk.scm?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b'>commit</a><a href='/guix/diff/gnu/packages/smalltalk.scm?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/smalltalk.scm'>
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<div class='path'>path: <a href='/guix/log/?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b'>root</a>/<a href='/guix/log/gnu?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b'>gnu</a>/<a href='/guix/log/gnu/packages?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b'>packages</a>/<a href='/guix/log/gnu/packages/smalltalk.scm?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b'>smalltalk.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/packages/smalltalk.scm?id=c1e7ae444a77aa5cc78a715f78843ccd178c9d6b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-01-05 12:51:12 +0100'>2021-01-05</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=df965a54e1f18dfd62ec8479623f61f4bddb9760'>gnu: smalltalk: Update to version 3.2.91.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/smalltalk.scm (smalltalk): Update to 3.2.91.

Co-Authored-By: Holger Peters &lt;holger.peters@posteo.de&gt;
</span></span></td><td>Miguel Ángel Arruga Vivas</td></tr>
<tr><td><span title='2021-01-05 12:51:12 +0100'>2021-01-05</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=e3281657c8a97e32169fcc7e178f3fbbab7c88b7'>gnu: smalltalk: Fix integer multiplication overflow.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/local.mk (dist_patch_DATA): Add Smalltalk patch.
* gnu/packages/patches/smalltalk-multiplication-overflow.patch: Patch
from upstream commit 72ada189aba0283c551ead16635c1983968080b8.
* gnu/packages/smalltalk.scm (smalltalk): Use patch and link with gmp
and lightning libraries instead of the included source.
</span></span></td><td>Miguel Ángel Arruga Vivas</td></tr>
<tr><td><span title='2020-07-25 13:55:57 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=30d6eb85dac539e19994f4637dfc60ecf8826c0b'>gnu: squeak-vm: Enter build directory once.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/smalltalk.scm (squeak-vm)[arguments]: Use CHDIR instead of
pseudofunctional WITH-DIRECTORY-EXCURSIONs.  Drop the custom ‘build’ phase.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-07-25 13:55:56 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu/packages/smalltalk.scm?id=b3c1dac11b108252491f88c0a2d8a4bde7575b9d'>gnu: squeak-vm: Update home page.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/smalltalk.scm (squeak-vm)[source, home-page]: Drop ‘www’ subdomain.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>