Adding support for uvc webcam in Gentoo

Emerge Kernel sources

  $ sudo -s
  # emerge -uva sys-kernel/gentoo-sources
  # cd /usr/src/linux

Copy recent kernel config to start with it

  # zcat /proc/config.gz > .config
  # make menuconfig

Enable V4L

|  Device Drivers -->
|    <*> Multimedia support -->
|      <*> Video For Linux

Compile new kernel, install it with modules

  # make
  # make modules_install
  # mount /boot
  # make install

Add new kernel to grub boot menu
(adapt to your kernel version and root partition)

  # vi /boot/grub/menu.lst

|  title Gentoo Linux new
|  root (hd0,0)
|  kernel /boot/vmlinuz-2.6.32-gentoo-r3 root=/dev/sda3

reboot