problems upgrading from 4.7 - 4.8

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Having successfully used 'make world' to upgrade from 4.6 to 4.7,
I thought I'd try the same to upgrade from 4.7 to 4.8 so that I can
start using the atapicam tools to access CDs. Alas, I've not been so
lucky.
cvsup for src-all was fine; the 'make buildworld' had no issues. However,
I have come unstuck with the new kernel: Below is a sample attempt at
a kernel build.

jacob# make buildkernel KERNCONF=JACOB
Running test variables
PASS: Test variables detected no regression, output matches.
Running test targets
PASS: Test targets detected no regression.
Running test sysvmatch
PASS: Test sysvmatch detected no regression.
Running test lhs_expn
FAIL: Test failed: regression detected.  See above.
*** Error code 1

Stop in /usr/src/tools/regression/usr.bin/make.
*** Error code 1

Stop in /usr/src/tools/regression/usr.bin/make.

--------------------------------------------------------------
 Building an up-to-date make(1)
--------------------------------------------------------------
sh /usr/src/tools/install.sh -s -o root -g wheel -m 555   make 
/usr/obj/usr/src/make.i386

--------------------------------------------------------------
>>> Kernel build for JACOB started on Thu Mar 20 20:33:11 GMT 2003
--------------------------------------------------------------
===> JACOB
mkdir -p /usr/obj/usr/src/sys
cd /usr/src/sys/i386/conf;  
PATH=/usr/obj/usr/src/i386/usr/sbin:/usr/obj/usr/src/i386/usr/bin:/usr/obj/usr/src/i386/usr/games:/sbin:/bin:/usr/sbin:/usr/bin 
 config  -d /usr/obj/usr/src/sys/JACOB  /usr/src/sys/i386/conf/JACOB
config: /usr/src/sys/i386/conf/JACOB:72: devices with zero units are not 
likely to be correct
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.

Looking at the kernel conf, the line that is reported as having the problem
is a comment! Anyone got ideas where I've gone wrong. Attempting a manual
build in /usr/src/sys/i386/conf gives different errors but still fails.

Julian