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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<div class='path'>path: <a href='/guix/log/?id=5a6567285780101d0ea0f6914afb656ef52daf72'>root</a>/<a href='/guix/log/tests?id=5a6567285780101d0ea0f6914afb656ef52daf72'>tests</a>/<a href='/guix/log/tests/processes.scm?id=5a6567285780101d0ea0f6914afb656ef52daf72'>processes.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/tests/processes.scm?id=5a6567285780101d0ea0f6914afb656ef52daf72&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-12-10 10:49:42 +0100'>2019-12-10</span></td><td><a href='/guix/commit/tests/processes.scm?id=0b5ad0e756a34d5e3ed1f37c3d4083a330fa33f5'>tests: processes: Skip tests if running with binfmt.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/processes.scm (binfmt-misc?): New procedure,
(test-assert*): new procedure that skips the test if binfmt-misc? returns
</span></span></td><td>Mathieu Othacehe</td></tr>