% cd /sys/arch/vax/conf
	% config GENERIC
	% cd ../compile/GENERIC
	% make depend && make
	% cp -p netbsd /newnetbsd
	% shutdown now
		...
	% cd /
	% mv netbsd onetbsd
	% mv newnetbsd netbsd
	% sync
	% sync
	% sync
	% reboot

	replace "vax" above with any other architecture ...

	if "config GENERIC" blows up on you, it may be because you're
	using a binary for "config" from version X.Y.Z yet you've been
	keen and grabbed a vastly newer source to which /sys points.

	rebuilding "config" with your new source is a good starting point.
	you may need to rebuild other things too...

| I'm trying to compile a kernel.  I have it in /usr/src/sys (/sys is symlinked
| to it).  I say "config GENERIC" to see if it works at all and it blows up
| with a bunch of "undefined attribute" errors.  I don't know what I'm doing and
| I can't find any documentation for building a kernel other than the i386 one.
| Anyone care to tell me what obvious step I'm missing?