I’ve had problems with this one. Although it had a built-in module in the kernel tree, it didn’t work. I’ve had to search a bit, and even when done, new kernel required new solution.
I’ve managed to locate the exact place. First, if you have a Philips webcam, OV5xx, which gives these kernel prints: drivers/usb/media/ov511.c: No decompressor available you might consider my post here.
First, go to this page and download and go to the 2.xx section. There you can download a rather new source package, which can, finally, compile smoothly on your kernel, assuming you use 2.6.14, like I do.
Well, for me it worked correctly, and, although I don’t use it much, I’m happy.