splitbrain/dokuwiki-plugin-upgrade — pull request #40 by Verber (2014-09-15 13:17:35+00:00)
Title: Fixed  PHP Fatal error:  Class 'Tar' not found

When I was upgrading from Adora Belle to Ponder Stibbons got error

PHP Fatal error: Class 'Tar' not found in /data/rodev/www/wiki/lib/plugins/upgrade/admin.php on line 327

This quick hack solved the problem