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Date: Thu, 24 Jul 1997 16:13:30 +0200 (MET DST)
From: Josef Belkovics <belkovic@algernon.osu.cz>
To: "Christopher L. Wall" <cwall@hhmail19.hh.uth.tmc.edu>
cc: "'freebsd-questions@FreeBSD.org'" <freebsd-questions@FreeBSD.ORG>
Subject: Re: installation files
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> Hi,
> Do I need the whole directory structure under 2.2.2-release to install or just some of it?
> If not all, what directories do I need?
> Thanks,
> Chris Wall

You don't. But you have to have good knowledge of structure. See here(7). 
I don't use /var as fbsd-partition and I have links on /tmp, /var/crash,
/var/mail, /var/tmp, /usr/obj, /usr/src, /usr/X11R6/src, (/usr/local) etc. 
I also have links on all files in /etc, which I changed. You must install
(with sysinstall) at least set bin. See also /etc/daily, weekly, monthly.
4.4 BSD structure is very clever and clear, on diference from 4.2 or 4.3. 

JPB