Warning: main(./class.ImlibImage.php) [function.main]: failed to open stream: No such file or directory in /usr/share/doc/php-imlib/examples/flip.php on line 12

Fatal error: main() [function.require]: Failed opening required './class.ImlibImage.php' (include_path='.:/usr/share/php:/usr/share/pear') in /usr/share/doc/php-imlib/examples/flip.php on line 12