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Date: Tue, 19 Jul 2011 18:41:31 +0000
From: "Dieter BSD" <dieterbsd@engineer.com>
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Cc: freebsd@sopwith.solgatos.com, freebsd@fokker.solgatos.com,
	FreeBSD Ports <freebsd-ports@freebsd.org>
Subject: Re: ports/158179: some packages do not fully honor -P dir option in
 pkg_add(1)
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> 1.  Spell out very clearly its purpose - is it to populate a jail, for
> example?

Populating a chroot/jail is one purpose.

Another is to test a new version of a package without messing up the
existing version.

There are bound to be other reasons.

Compiling the port rather than installing a package isn't always
a solution.  Many ports are incredibly difficult to get compiled.

PREFIX needs to be an install time variable, not compile time.