From owner-freebsd-questions@FreeBSD.ORG  Tue Nov 30 16:54:41 2004
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 5594716A4CE
	for <freebsd-questions@freebsd.org>;
	Tue, 30 Nov 2004 16:54:41 +0000 (GMT)
Received: from nic.ach.sch.gr (nic.sch.gr [194.63.238.4])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 5FD0D43D54
	for <freebsd-questions@freebsd.org>;
	Tue, 30 Nov 2004 16:54:40 +0000 (GMT)
	(envelope-from keramida@ceid.upatras.gr)
Received: (qmail 1048 invoked by uid 207); 30 Nov 2004 16:54:39 -0000
Received: from keramida@ceid.upatras.gr by nic by uid 201 with
	qmail-scanner-1.21 
	(sophie: 3.04/2.19/3.81.  Clear:RC:1(81.186.70.48):. 
	Processed in 0.469703 secs); 30 Nov 2004 16:54:39 -0000
Received: from dialup48.ach.sch.gr (HELO gothmog.gr) ([81.186.70.48])
          (envelope-sender <keramida@ceid.upatras.gr>)
          by nic.sch.gr (qmail-ldap-1.03) with DES-CBC3-SHA encrypted SMTP
          for <jcm@FreeBSD-uk.eu.org>; 30 Nov 2004 16:54:38 -0000
Received: from gothmog.gr (gothmog [127.0.0.1])
	by gothmog.gr (8.13.1/8.13.1) with ESMTP id iAUGsZXG012310;
	Tue, 30 Nov 2004 18:54:35 +0200 (EET)
	(envelope-from keramida@ceid.upatras.gr)
Received: (from giorgos@localhost)
	by gothmog.gr (8.13.1/8.13.1/Submit) id iAUGsZKT012285;
	Tue, 30 Nov 2004 18:54:35 +0200 (EET)
	(envelope-from keramida@ceid.upatras.gr)
Date: Tue, 30 Nov 2004 18:54:35 +0200
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Jonathon McKitrick <jcm@FreeBSD-uk.eu.org>
Message-ID: <20041130165434.GD2610@gothmog.gr>
References: <20041130153247.GB29674@dogma.freebsd-uk.eu.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20041130153247.GB29674@dogma.freebsd-uk.eu.org>
cc: freebsd-questions@freebsd.org
Subject: Re: Source tree hierarchy
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 30 Nov 2004 16:54:41 -0000

On 2004-11-30 15:32, Jonathon McKitrick <jcm@FreeBSD-uk.eu.org> wrote:
>
> Why are there sometimes 2 levels of the same directory name, one beneath the
> other?
>
> Like sys and i386, for example?

They are different things:

/usr/src/sys		Kernel sources (entire source tree).

/usr/src/sys/sys	Kernel header files.  These are installed as
			/usr/include/sys/* by the installation process.