diff -urNp -x '*.orig' mythplugins-0.26.1.org/mythweb/mythweb.php mythplugins-0.26.1/mythweb/mythweb.php
--- mythplugins-0.26.1.org/mythweb/mythweb.php	2013-06-26 23:10:02.000000000 +0200
+++ mythplugins-0.26.1/mythweb/mythweb.php	2021-09-26 12:19:53.182932909 +0200
@@ -8,6 +8,9 @@
  *
 /**/
 
+// MythWeb seems uses relative paths for everything... let it work
+  chdir('/usr/share/mythweb');
+
 // Add a custom include path?
     if (!empty($_SERVER['include_path']) && $_SERVER['include_path'] != '.') {
         ini_set('include_path', $_SERVER['include_path'].PATH_SEPARATOR.ini_get('include_path'));