package xfce4 - where is xfwm4

[Luc Desfosses <desfosses.luc%wanadoo.fr@localhost>]

I just install xfce4 with pkgsrc2006Q1.

I'm very happy, everything is fine.

But now I want to install themes with transparancy.
when i look at the xfce documentation:

http://www.xfce.org/index.php?page=documentation

I see

xfwm4     --enable-compositor     #enables the xfwm4 compositing manager 
(if Xorg >= 6.8 is installed)

It's perfect, i use xorg 6.9

But i don't find xfwm4 in pkgsrc ?
It's the first time i use xfce, maybe the transparency is already enabled.

Thanks for your time.