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Date: Wed, 20 Jun 2012 17:58:32 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
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Cc: Chris Rees <crees@freebsd.org>, Mark Linimon <linimon@lonesome.com>,
	Mel Flynn <rflynn@acsalaska.net>,
	Scot Hetzel <swhetzel@gmail.com>, Andriy Gapon <avg@freebsd.org>
Subject: USE_ and WANT_ for the Porter's Handbook
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Here's a bare-bones pass at documenting the difference between USE_ and 
WANT_ variables.  WITH_ and WITHOUT_ have been removed because of the 
optionsng rework, and there is a Knobs section later in the PH that 
already describes them.

This section has been added to the end of the Dependencies section, 
currently 5.7.  It could be moved elsewhere.

http://www.wonkity.com/~wblock/porter/book.html
http://www.wonkity.com/~wblock/porter/usewant.diff