"Video4Linux version 1 (V4L1) was obsoleted in the kernel by version 2 (V4L2) some years ago and newer video capture drivers do not support V4L1."
-- http://wiki.debian.org/ReleaseGoals/NoVideo4Linux1
On Debian I've applied the attached patch to make v4l2 build fine against the newest kernels thus I've thought you might be interested in doing the same.
quadrispro, your patch work fine here on gentoo.