Check this forum thread for more info:
http://forums.gentoo.org/viewtopic.php? ... tudio+pctv
In your kernel config, make sure you have these (preferrably as modules):
Multimedia Devices-->Video For Linux-->BT848 Video For Linux
Character Devices-->I2C support-->I2C support
Character Devices-->I2C support-->I2C bit-banging interfaces
Character Devices-->I2C support-->I2C device interface
Character Devices-->I2C support-->I2C /proc interface
Now do the usual kernel mambo - make dep && make bzImage modules modules_install
...and hopefully, you have all you need upon a restart (dont forget to copy the bzImage to /boot, and change the grub/lilo config (if needed)).
If you managed to load the module, you can do
dmesg | grep bttv to see what it had to say about your card.
Now, understand that it might still not work as well as you expected - the bttv module (or its brother, the tuner module) needs to know what kind of tuner you have on your card (there are some 40-ish different ones). If you're lucky, a simple modprobe bttv will autodetect your tuner module and other settings...but there is a chance you have to tell it to us a different one. Dont' be alarmed. Come back if you need more help (and dont forget to read that other forum thread, as i only skimmed it quickly)