brewkit.rb changes ENV destructively, so lets not do that everytime a formula
is required. Now it's possible for other tools to require a formula
description without worrying about side-effects.
The GNU Compact Disc Input and Control library (libcdio) contains a
library for CD-ROM and CD image access. Applications wishing to be
oblivious of the OS- and device-dependent properties of a CD-ROM or
of the specific details of various CD-image formats may benefit from
using this library.
