buildkernel error in 5.1_RELEASE

I have downloaded the 5.1-RELEASE source via sysinstall and while world 
build fine, I have this error when trying to compile a new kernel from the 
downloaded source on Alpha:

cc -c -O -pipe -mcpu=ev45 -mieee -Wall -Wredundant-decls -Wnested-externs 
-Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline 
-Wcast-qual  -fformat-extensions -std=c99  -nostdinc -I-  -I. 
-I/usr/src/sys -I/usr/src/sys/dev -I/usr/src/sys/contrib/dev/acpica 
-I/usr/src/sys/contrib/ipfilter -D_KERNEL -include opt_global.h 
-fno-common  -mno-fp-regs -ffixed-8 -Wa,-mev6 -ffreestanding -Werror  vers.c
linking kernel
init_main.o: In function `proc0_init':
init_main.o(.text+0x424): undefined reference to `kse0_sched'
init_main.o(.text+0x430): undefined reference to `ksegrp0_sched'
init_main.o(.text+0x43c): undefined reference to `proc0_sched'
init_main.o(.text+0x448): undefined reference to `thread0_sched'
*** Error code 1

Stop in /usr/obj/usr/src/sys/AYLEE.
*** Error code 1

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

Stop in /usr/src.


aylee# uname -a
FreeBSD aylee.number6 5.0-RELEASE-p7 FreeBSD 5.0-RELEASE-p7 #0: Mon May  5 
23:29:58 EST 2003     root_at_aylee.number6:/usr/obj/usr/src/sys/AYLEE  alpha

cheers,
Rob


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