Enabling X video extensions

[csj <csj@mindgate.net>]

I finally managed to build XFree86 from source. Question now is how 
do I enable the X video extensions? I get the following when I type 
"xvinfo":

alpha:~$ xvinfo
X-Video Extension version 2.2
screen #0
 no adaptors present

I'm using a card that works with the "savage_drv.o" module.