Cannot build picobsd under

[jumbler chi]

Hi :
My box is  FreeBSD 5.2-R
PICOBSD is interesting to me. 

I cvsup all source code , and create a picobsd image via 
picobsd command.
but when it run to  link kernel , it raised some error as following.
what's matter ?!
Does anyone can share the expeirence  ?!  

regards!

Jumbler 
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sh /usr/src/sys/conf/newvers.sh PICOBSD
cc -c -O -pipe -mcpu=pentiumpro -Wall -Wredundant-decls -Wnested-externs -Wstric
t-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -fforma
t-extensions -std=c99  -nostdinc -I-  -I. -I/usr/src/sys -I/usr/src/sys/contrib/
dev/acpica -I/usr/src/sys/contrib/ipfilter -I/usr/src/sys/contrib/dev/ath -I/usr
/src/sys/contrib/dev/ath/freebsd -I/usr/src/sys/contrib/ngatm -D_KERNEL -include
 opt_global.h -fno-common -finline-limit=15000 -fno-strict-aliasing  -mno-align-
long-strings -mpreferred-stack-boundary=2 -ffreestanding -Werror  vers.c
linking kernel
init_main.o: In function `proc0_init':
init_main.o(.text+0x2b9): undefined reference to `kse0_sched'
init_main.o(.text+0x2c3): undefined reference to `ksegrp0_sched'
init_main.o(.text+0x2cd): undefined reference to `proc0_sched'
init_main.o(.text+0x2d7): undefined reference to `thread0_sched'
kern_clock.o: In function `statclock':
kern_clock.o(.text+0x714): undefined reference to `sched_clock'
kern_condvar.o: In function `cv_wait':
kern_condvar.o(.text+0x1ad): undefined reference to `sched_sleep'
kern_condvar.o: In function `cv_wait_sig':
kern_condvar.o(.text+0x457): undefined reference to `sched_sleep'
kern_condvar.o: In function `cv_timedwait':
kern_condvar.o(.text+0xadd): undefined reference to `sched_sleep'
kern_condvar.o: In function `cv_timedwait_sig':
kern_condvar.o(.text+0xe27): undefined reference to `sched_sleep'
kern_exit.o: In function `exit1':
kern_exit.o(.text+0x14ae): undefined reference to `sched_exit'
kern_fork.o: In function `fork1':
kern_fork.o(.text+0xd74): undefined reference to `sched_fork'
kern_idle.o: In function `idle_proc':
kern_idle.o(.text+0x1f1): undefined reference to `sched_runnable'
kern_thr.o: In function `thr_exit1':
kern_thr.o(.text+0xe8): undefined reference to `sched_exit_kse'
kern_thr.o(.text+0x17b): undefined reference to `sched_exit_thread'
kern_thr.o: In function `thr_create':
kern_thr.o(.text+0x461): undefined reference to `sched_fork_kse'
kern_thr.o(.text+0x473): undefined reference to `sched_fork_thread'
kern_proc.o: In function `procinit':
kern_proc.o(.text+0xf1): undefined reference to `sched_sizeof_proc'
kern_proc.o: In function `fill_kinfo_thread':
kern_proc.o(.text+0x16b0): undefined reference to `sched_pctcpu'
kern_resource.o: In function `donice':
kern_resource.o(.text+0x9a8): undefined reference to `sched_nice'
kern_resource.o: In function `rtp_to_pri':
kern_resource.o(.text+0xd75): undefined reference to `sched_class'
kern_resource.o(.text+0xda8): undefined reference to `sched_prio'
kern_subr.o: In function `uio_yield':
kern_subr.o(.text+0x623): undefined reference to `sched_prio'
kern_switch.o: In function `choosethread':
kern_switch.o(.text+0x11): undefined reference to `sched_choose'
kern_switch.o: In function `kse_reassign':
kern_switch.o(.text+0x101): undefined reference to `sched_add'
kern_switch.o: In function `adjustrunqueue':
kern_switch.o(.text+0x18f): undefined reference to `sched_rem'
kern_switch.o(.text+0x197): undefined reference to `sched_add'
kern_switch.o(.text+0x1d4): undefined reference to `sched_rem'
kern_switch.o: In function `setrunqueue':
kern_switch.o(.text+0x2b8): undefined reference to `sched_rem'
kern_switch.o(.text+0x390): undefined reference to `sched_add'
kern_synch.o: In function `msleep':
kern_synch.o(.text+0x55c): undefined reference to `sched_sleep'
kern_synch.o: In function `mi_switch':
kern_synch.o(.text+0xe57): undefined reference to `sched_switch'
kern_synch.o: In function `setrunnable':
kern_synch.o(.text+0xf26): undefined reference to `sched_wakeup'
kern_synch.o: In function `yield':
kern_synch.o(.text+0x1184): undefined reference to `sched_prio'
kern_thread.o: In function `kse_create':
kern_thread.o(.text+0x158d): undefined reference to `sched_fork_ksegrp'
kern_thread.o(.text+0x16ed): undefined reference to `sched_fork_kse'
kern_thread.o: In function `threadinit':
kern_thread.o(.text+0x1ad7): undefined reference to `sched_sizeof_thread'
kern_thread.o(.text+0x1b21): undefined reference to `sched_sizeof_ksegrp'
kern_thread.o(.text+0x1b6b): undefined reference to `sched_sizeof_kse'
kern_thread.o: In function `thread_exit':
kern_thread.o(.text+0x2ceb): undefined reference to `sched_exit_thread'
kern_thread.o(.text+0x2cfd): undefined reference to `sched_exit_kse'
kern_thread.o(.text+0x2d31): undefined reference to `sched_exit_ksegrp'
kern_thread.o: In function `thread_schedule_upcall':
kern_thread.o(.text+0x3223): undefined reference to `sched_fork_thread'
subr_trap.o: In function `userret':
subr_trap.o(.text+0x12): undefined reference to `sched_userret'
subr_trap.o: In function `ast':
subr_trap.o(.text+0x6bf): undefined reference to `sched_prio'
subr_turnstile.o: In function `propagate_priority':
subr_turnstile.o(.text+0x68): undefined reference to `sched_prio'
vm_zeroidle.o: In function `vm_pagezero':
vm_zeroidle.o(.text+0x41d): undefined reference to `sched_runnable'
vm_pageout.o: In function `vm_pageout_scan':
vm_pageout.o(.text+0x1bc4): undefined reference to `sched_nice'
machdep.o: In function `cpu_idle':
machdep.o(.text+0x106e): undefined reference to `sched_runnable'
*** Error code 1

Stop in /usr/src/release/picobsd/net/build_dir-net/PICOBSD-net.
*** Error code 1

Stop in /usr/src/release/picobsd/net.
---> fail: Error <1> error code <missing_kernel> in <>
Error: you must build PICOBSD kernel first
---> Aborting /usr/local/bin/picobsd