From owner-freebsd-arch@FreeBSD.ORG  Fri Oct 26 18:09:13 2012
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Date: Fri, 26 Oct 2012 11:09:12 -0700
From: David O'Brien <obrien@FreeBSD.org>
To: Ian Lepore <freebsd@damnhippie.dyndns.org>
Subject: Re: [CFT/RFC]: refactor bsd.prog.mk to understand multiple
 programs instead of a singular program
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On Fri, Oct 26, 2012 at 09:41:36AM -0600, Ian Lepore wrote:
> We have to be able to build the same source for multiple versions of
> freebsd, so even finding all the old :U and :L and any other
> incompatibilities and fixing them isn't an option because we'd just
> trade "works in freebsd 10" for "broken in every other environment".

Ian,
If you're using FreeBSD 9 after 2012-06-14, or FreeBSD 8 or 7 after
2012-10-09 you can use the Bmake spelling of ":U" and ":L" (:tu/:tl).

I am not aruging against you, just giving some information you may not
be aware of.

-- 
-- David  (obrien@FreeBSD.org)