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
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<tr><td><span title='2021-02-02 00:28:49 -0500'>2021-02-02</span></td><td><a href='/guix/commit/build-aux/test-driver.scm?id=5e652e94a9203e0cfa27e93a89878439b7900001'>build: Add a --show-duration option to the SCM test-driver.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-01-31 22:28:46 -0500'>2021-01-31</span></td><td><a href='/guix/commit/build-aux/test-driver.scm?id=26a66d0feaab7626c4053071d5557394931fe14b'>build: test-driver.scm: Allow running as a standalone script.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-01-31 22:28:46 -0500'>2021-01-31</span></td><td><a href='/guix/commit/build-aux/test-driver.scm?id=93a628c4e4f4a7f6665190f3c52a417daebaf28a'>build: test-driver.scm: Add a new '--errors-only' option.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-01-31 22:28:37 -0500'>2021-01-31</span></td><td><a href='/guix/commit/build-aux/test-driver.scm?id=a1ea2acb376c8a74f41ce0e683680417207b365a'>build: test-driver.scm: Add test cases filtering options.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-01-31 22:23:41 -0500'>2021-01-31</span></td><td><a href='/guix/commit/build-aux/test-driver.scm?id=346210b1b2130112dd5f894c1d40afb37c1c51a5'>build: test-driver.scm: Enable colored test results by default.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-01-31 22:23:41 -0500'>2021-01-31</span></td><td><a href='/guix/commit/build-aux/test-driver.scm?id=13f299b2c98cce0ede3a8a37dd11832fdb3827bb'>build: test-driver.scm: Make output redirection optional.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>