WordPress MU

Trying to install and get:

Fatal error: Call to undefined function: glob() in /***/wp-inst/wpmu-settings.php on line 62

I understand this is because I'm running PHP 4.2.2 and glob was introduced in 4.3. Upgrading PHP is not an option. Is there a workaround for this? Barring that I guess I could do a search for all the glob functions and rewrite them. Are there any other 4.3 dependencies?

There is a replacement for glob that is detailed here define that in one of the core WP includes and you should be good to go, just remember to add it back in if you upgrade WPMU and are still on the older version of PHP.

However I don't know if there are any other compatibility problems.