修正

To build a kernel

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If you are updating from a prior version of FreeBSD (even one just a few days old), you should follow this procedure. With a /usr/obj tree with a fresh buildworld,It is the most failsafe as it uses a /usr/obj tree with a fresh mini-buildworld,

make kernel-toolchain
make -DALWAYS_CHECK_MAKE buildkernel KERNCONF=YOUR_KERNEL_HERE
make -DALWAYS_CHECK_MAKE installkernel KERNCONF=YOUR_KERNEL_HERE

commit log

Be a little more obvious about the steps to build a kernel.
$FreeBSD: src/UPDATING,v 1.420 2005/09/09 15:59:17 obrien Exp $