make buildworld fails

[Jamie Avery]

Hi
I have a custom Kernel Config file in /usr/src/sys/amd64/conf/.  I have 
put KERNCONF=/kernelname/ into /etc/make.conf.  However, when I make 
buildkernel, I get the following error

ERROR: Missing kernel configuration file(s) (/kernelname/).
*** Error code 1

Make.conf appears to be looking for the Kernel config file in the 
/i386/conf/ folder, as when I put a copy of /kernelname  /in the 
/i386/conf directory it starts to run, before failing on various unknown 
parameters that I assume are specific to the amd64 architecture.  Am I 
missing something? Do I need to state my processor architecture 
elsewhere? Or explicitly tell make.conf to look in the amd64 directory 
rather than the i386?

Any help greatly appreciated.

Jamie