Upgrading 5.5-STABLE to 6-STABLE

[Clint Olsen]

Hi:

I bet this is documented /somewhere/, so if the response is in the form
of a single URL, I'm cool with that.  I'm trying to buildkernel and I'm
getting config(8) errors:

ERROR: version of config(8) does not match kernel!
config version = 500013, version required = 600003

What's the process of building from source a new version of FreeBSD?

Thanks,

-Clint