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Date: Thu, 23 Sep 2010 15:42:37 +0100
From: Arthur Chance <freebsd@qeng-ho.org>
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To: Polytropon <freebsd@edvax.de>
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Cc: freebsd-questions@freebsd.org
Subject: Re: rebuilding world - is "chflags -R noschg *" necessary?
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On 09/23/10 15:10, Polytropon wrote:
> On Thu, 23 Sep 2010 12:02:17 +0100, Anton Shterenlikht<mexas@bristol.ac.uk>  wrote:
>> I've never seen a file under /usr/obj/ with immutable flag set.
>
> I think it was a directory called empty/ that couldn't be removed
> unless the flag was unset. This makes this step neccessary when
> you rm -rf /usr/obj the object subtree.

I think you're thinking of /var/empty, not something under /usr/obj. On 
my machine find fails to find anything immutable under /usr/obj.