The i2c API has changed, please download the i2c package below, NOT the CVS version. BTTV-V4L2 will soon be updated to the new API.
This version only compiles on 2.2.x kernels. I do not have a 2.3.x kernel to test on, nor do I have the HDD space at the moment to keep both kernel trees. If anybody wants to work on a port to 2.3.x, I will be glad to give all the help I can, but I cannot test it myself.
Latest version:
bttv-v4l2-000321.tgz
You will also need the new i2c drivers available from here:
i2c-991123.tgz.
Older versions:
Here