this is the error I get

this is the error on fbsd 5.2.1-rc2 I get . Can anyone help with this.
I want to have a demo for monday 

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+0x1dd): undefined reference to `sched_sleep'
kern_condvar.o: In function `cv_wait_sig':
kern_condvar.o(.text+0x4dd): undefined reference to `sched_sleep'
kern_condvar.o: In function `cv_timedwait':
kern_condvar.o(.text+0xbbd): undefined reference to `sched_sleep'
kern_condvar.o: In function `cv_timedwait_sig':
kern_condvar.o(.text+0xf4d): undefined reference to `sched_sleep'
kern_exit.o: In function `exit1':
kern_exit.o(.text+0x160e): 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+0x1760): 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+0x58c): undefined reference to `sched_sleep'
kern_synch.o: In function `mi_switch':
kern_synch.o(.text+0xec7): undefined reference to `sched_switch'
kern_synch.o: In function `setrunnable':
kern_synch.o(.text+0xf96): undefined reference to `sched_wakeup'
kern_synch.o: In function `yield':
kern_synch.o(.text+0x11f4): 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+0x6e4): undefined reference to `sched_prio'
subr_turnstile.o: In function `propagate_priority':
subr_turnstile.o(.text+0x68): undefined reference to `sched_prio'
ksched.o: In function `ksched_attach':
ksched.o(.text+0x31): undefined reference to `sched_rr_interval'
ksched.o: In function `ksched_setscheduler':
ksched.o(.text+0x3c3): undefined reference to `sched_prio'
ksched.o(.text+0x4c3): undefined reference to `sched_prio'
ffs_snapshot.o: In function `ffs_snapshot':
ffs_snapshot.o(.text+0xbdb): undefined reference to `sched_nice'
ffs_snapshot.o(.text+0x27ab): undefined reference to `sched_nice'
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/sys/i386/compile/ASTPBX.
*** Error code 1