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From: krishnan@hplabsb.UUCP (N K Krishnan)
Newsgroups: comp.unix.wizards
Subject: Re: Building a 4.3BSD kernel under 4.2
Message-ID: <61200001@hplabsb.UUCP>
Date: Fri, 21-Aug-87 21:58:00 EDT
Article-I.D.: hplabsb.61200001
Posted: Fri Aug 21 21:58:00 1987
Date-Received: Sun, 23-Aug-87 08:13:06 EDT
References: <8943@brl-adm.ARPA>
Organization: Hewlett-Packard Laboratories - Palo Alto, CA
Lines: 4

Or you could use a spare file system, mount the 4.3 root file system there,
and chroot to it.  As long as you do not use the csh after you get chrooted
you should be ok.  I had to write a real short program to chroot and exec
/bin/sh.