How do I 'activate' mod_php5?

[Kjell Midtseter]

After installing lang/php4-extensions with apache13, 
I can start using embedded php in my web pages right away. 
When installing lang/php5-extensions, the embedded php 
is passed as if it were html without being interpreted. 
Any initialization required fro php5?
The required modules seems to be in place in httpd.conf
I get the same results when I make a new clean and cvsup'ed install from the 5.3R CD 
Kjell