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 Boehm-Demers-Weiser conservative garbage collector can be used as a garbage collecting
replacement for C malloc or C++ new. It allows you to allocate memory basically as you
normally would, without explicitly deallocating memory that is no longer useful. The collector
automatically recycles memory when it determines that it can no longer be otherwise accessed.
Adam Vandenberg:
Update bdw-gc formula for 10.6
