kernel not compile on AMD64

Hi,

I can't configure my customized kernel.  I'm getting an error compiling
from the start.
I've done kernel customization with FreeBSD and NetBSD before and both
are the same with OpenBSD.

1)
Here are what I've done:
cp GENERIC.MP newkrnl
cp GENERIC generic

-------------------------------
OpenBSD64:4#ls
CVS             Makefile.amd64  files.amd64     newkrnl
GENERIC         RAMDISK         generic         newkrnl~
GENERIC.MP      RAMDISK_CD      kern.ldscript

-----------------------

2)
then:
OpenBSD64:5#config newkrnl


3)
OpenBSD64:8#
OpenBSD64:8#cd ../compile/newkrnl

4)
OpenBSD64:14#make depend
make: don't know how to make ../../../../arch///locore.S. Stop in
/usr/src/sys/arch/amd64/compile/newkrnl.

OpenBSD64:15#pwd
/usr/src/sys/arch/amd64/compile/newkrnl
OpenBSD64:16#


There's no rush.  This is my personal PC.  I'm just want to work on my
RaidFrame.
I also enter my comment in Facebook, just in case someone has the same
problem.

Thank you,
Jay