From owner-freebsd-hackers@FreeBSD.ORG  Fri Nov 23 23:22:47 2012
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Date: Fri, 23 Nov 2012 18:16:02 -0500
From: "Dieter BSD" <dieterbsd@engineer.com>
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Subject: Re: old style kernel configuration
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Julian writes:
> it is however a good way to get mismatching kernel and userland
> but that's not what we are discussing.

The method recommended on
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-building.html
"# make buildkernel KERNCONF=MYKERNEL"
is also a good way to get mismatching kernel and userland. Or any other
way of building just the kernel rather than everything.