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Date: Wed, 16 May 2012 20:47:43 -0500
From: Mark Linimon <linimon@lonesome.com>
To: Andriy Gapon <avg@FreeBSD.org>
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User-Agent: Mutt/1.5.20 (2009-06-14)
Cc: Scot Hetzel <swhetzel@gmail.com>, freebsd-ports@FreeBSD.org
Subject: Re: WITH_GCC
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On Fri, May 11, 2012 at 12:10:25AM +0300, Andriy Gapon wrote:
> P.S.
> Perhaps this information should also be somewhere in the Porter's Handbook.

It is scattered around in it:

WITH/WITHOUT:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/makefile-options.html#AEN2542

USE:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/makefile-depend.html#USE-VARS

Unfortunately WANT is only documented in bsd.port.mk itself.  Does
anyone wish to take on the task of adding a tips-and-tricks entry
about the difference between the 3 to the PH?

http://www.freebsd.org/cgi/cvsweb.cgi/ports/Mk/bsd.port.mk?annotate=1.708
(line 285)

mcl