Empty page in my browser.

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Hello, all!

I tried to install a Roundcube on my FreeBSD 6.0 server but it was unsuccessfull.
Instead of index.php page a see an empty page. It looks like php5 is not correctly installed but others applications works fine.
I used this howto to install - http://fak3r.com/?p=67 but I install roundcube from ports.
Help, please.