Call to undefined function: session_start() in /usr/local/or

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All,
I am trying to wedge oreon 1.3.1 onto Novell SuSE Linux Open Enterprise Server (OES) with limited success. I managed to get everything (i thought anyway) installed, but the first time login provides the following error:

Call to undefined function: session_start() in /usr/local/oreon/www/class/Session.class.php on line 29

I am guessing that I have missed a PHP extension, but is anyone with a PHP brain able to suggest what I might have missed?

Cheers.

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Never mind

Solution: install php4-session