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Date: Mon, 25 Jan 2016 18:49:54 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: "Brandon J. Wandersee" <brandon.wandersee@gmail.com>
cc: Tim Daneliuk <tundra@tundraware.com>, Terje Elde <terje@elde.net>,
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Subject: Re: [installworld] Do We need /usr/obj
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On Sun, 24 Jan 2016, Brandon J. Wandersee wrote:

>
> Tim Daneliuk writes:
>
>> OK, thanks.  I'll have to ponder another way around this.
>
> First: what version of FreeBSD are you running? I didn't see mention of
> it.
>
> Second: placing NO_CLEAN="YES" in /etc/make.conf will greatly reduce
> build time, though using it on anything but -RELEASE would probably be a
> bad idea.

Why?  I use NO_CLEAN routinely to update between versions of 10-stable. 
If there is ever a problem, it's easy enough to delete /usr/obj (faster 
than 'make clean') and try again.

Actually, this is part of a fairly involved build script that automates 
the normal process.