slackbuilds/libraries/libv4l

libv4l is a collection of libraries which adds a thin abstraction
layer on top of video4linux2 devices. The purpose of this (thin)
layer is to make it easy for application writers to support a wide
variety of devices without having to write seperate code for
different devices in the same class.

You may need libv4l to use some video applications - see the README
in the libv4l documentation folder for usage instructions.