Modified to compile on jammy jellyfish.

html/search/nomatches.html

@@ -1,5 +1,6 @@
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html><head><title></title>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head><title></title>
 <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
 <link rel="stylesheet" type="text/css" href="search.css"/>
 <script type="text/javascript" src="search.js"></script>