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
ut</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>refs</a><a class='active' href='/guix/log/gnu/system/examples/docker-image.tmpl'>log</a><a href='/guix/tree/gnu/system/examples/docker-image.tmpl?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>tree</a><a href='/guix/commit/gnu/system/examples/docker-image.tmpl?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>commit</a><a href='/guix/diff/gnu/system/examples/docker-image.tmpl?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/system/examples/docker-image.tmpl'>
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<div class='path'>path: <a href='/guix/log/?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>root</a>/<a href='/guix/log/gnu?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>gnu</a>/<a href='/guix/log/gnu/system?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>system</a>/<a href='/guix/log/gnu/system/examples?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>examples</a>/<a href='/guix/log/gnu/system/examples/docker-image.tmpl?id=a2e661e95f8ab2fcb7741198234395b367a794c1'>docker-image.tmpl</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/system/examples/docker-image.tmpl?id=a2e661e95f8ab2fcb7741198234395b367a794c1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-25 23:37:06 +0100'>2019-03-25</span></td><td><a href='/guix/commit/gnu/system/examples/docker-image.tmpl?id=cf848cc0a17a3a58d600116896f6e7abfb0440d4'>accounts: Add default value for the 'home-directory' field of &lt;user-account&gt;.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/accounts.scm (&lt;user-account&gt;)[home-directory]: Mark as
thunked and add a default value.
(default-home-directory): New procedure.
* doc/guix.texi (User Accounts): Remove 'home-directory' from example.
* gnu/system/examples/bare-bones.tmpl: Likewise.
* gnu/system/examples/beaglebone-black.tmpl: Likewise.
* gnu/system/examples/desktop.tmpl: Likewise.
* gnu/system/examples/docker-image.tmpl: Likewise.
* gnu/system/examples/lightweight-desktop.tmpl: Likewise.
* gnu/system/install.scm (installation-os): Likewise.
* gnu/tests.scm (%simple-os): Likewise.
* gnu/tests/install.scm (%minimal-os, %minimal-os-on-vda):
(%separate-home-os, %encrypted-root-os, %btrfs-root-os): Likewise.
* tests/accounts.scm ("allocate-passwd")
("allocate-passwd with previous state"): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-20 16:11:00 +0200'>2019-01-20</span></td><td><a href='/guix/commit/gnu/system/examples/docker-image.tmpl?id=7194745a16008947f6cf1a3aba0f86e8ca18c2f6'>services: Use guix-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/base.scm (%base-services): Replace guix-service with
guix-service-type.
* gnu/system/examples/docker-image.tmpl (services): Same.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-03-24 03:04:11 +0100'>2018-03-24</span></td><td><a href='/guix/commit/gnu/system/examples/docker-image.tmpl?id=a335f6fcc9aac1afb49a562968107abf7c87e631'>system: Add "guix system docker-image" command.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/vm.scm (system-docker-image): New procedure.
* guix/scripts/system.scm (system-derivation-for-action): Add a case for
  docker-image, and in that case, call system-docker-image.
  (show-help): Document docker-image.
  (guix-system): Parse arguments for docker-image.
* doc/guix.texi (Invoking guix system): Document "guix system
  docker-image".
* gnu/system/examples/docker-image.tmpl: New file.
</span></span></td><td>Chris Marusich</td></tr>