大家帮忙看我这次编译代码时的问题，是哪个选项选错了？

以下是出错提示。
环境：Freebsd4.10-stable+gcc version 2.95.4 20020320 [FreeBSD]

********************************************************************************
****************************出错提示******************************************

cc -c -O -pipe -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -fformat-extensions -ansi -nostdinc -I- -I. -I../.. -I../../../include -I../../contrib/dev/acpica -I../../contrib/ipfilter -D_KERNEL -include opt_global.h -mpreferred-stack-boundary=2 vers.c
linking kernel
umass.o: In function `umass_cam_attach_sim':
umass.o(.text+0x1637): undefined reference to `cam_simq_alloc'
umass.o(.text+0x165d): undefined reference to `cam_sim_alloc'
umass.o(.text+0x1676): undefined reference to `xpt_bus_register'
umass.o(.text+0x1686): undefined reference to `cam_simq_free'
umass.o: In function `umass_cam_rescan_callback':
umass.o(.text+0x169f): undefined reference to `xpt_free_path'
umass.o: In function `umass_cam_rescan':
umass.o(.text+0x16ef): undefined reference to `xpt_periph'
umass.o(.text+0x16f8): undefined reference to `xpt_create_path'
umass.o(.text+0x170b): undefined reference to `xpt_setup_ccb'
umass.o(.text+0x1726): undefined reference to `xpt_action'
umass.o: In function `umass_cam_detach_sim':
umass.o(.text+0x17df): undefined reference to `xpt_bus_deregister'
umass.o(.text+0x17fd): undefined reference to `cam_sim_free'
umass.o: In function `umass_cam_detach':
umass.o(.text+0x183e): undefined reference to `xpt_create_path'
umass.o(.text+0x185f): undefined reference to `xpt_async'
umass.o(.text+0x1867): undefined reference to `xpt_free_path'
umass.o: In function `umass_cam_action':
umass.o(.text+0x1beb): undefined reference to `xpt_done'
umass.o(.text+0x1bfd): undefined reference to `xpt_done'
umass.o: In function `umass_cam_cb':
umass.o(.text+0x1d19): undefined reference to `xpt_done'
umass.o: In function `umass_cam_sense_cb':
umass.o(.text+0x1e20): undefined reference to `xpt_done'
umass.o(.text+0x1e31): undefined reference to `xpt_done'
umass.o(.text+0x1e4b): more undefined references to `xpt_done' follow
*** Error code 1

*************************************************************************
**************************内核配置文件*******************************
*************************************************************************
machine i386
cpu I686_CPU
ident bluebell
maxusers 64

options INET #InterNETworking
options FFS #Berkeley Fast Filesystem
options FFS_ROOT #FFS usable as root device [keep this!]
options SOFTUPDATES #Enable FFS soft updates support
options UFS_DIRHASH #Improve performance on big directories
options MFS #Memory Filesystem
options MD_ROOT #MD is a potential root device
options MSDOSFS #MSDOS Filesystem
options CD9660 #ISO 9660 Filesystem
options CD9660_ROOT #CD-ROM usable as root, CD9660 required
options PROCFS #Process filesystem
options COMPAT_43 #Compatible with BSD 4.3 [KEEP THIS!]
options UCONSOLE #Allow users to grab the console
options USERCONFIG #boot -c editor
options VISUAL_USERCONFIG #visual boot -c editor
options KTRACE #ktrace(1) support
options SYSVSHM #SYSV-style shared memory
options SYSVMSG #SYSV-style message queues
options SYSVSEM #SYSV-style semaphores
options P1003_1B #Posix P1003_1B real-time extensions
options _KPOSIX_PRIORITY_SCHEDULING
options ICMP_BANDLIM #Rate limit bad replies
options KBD_INSTALL_CDEV # install a CDEV entry in /dev
options AHC_REG_PRETTY_PRINT # Print register bitfields in debug
# output. Adds ~128k to driver.
options AHD_REG_PRETTY_PRINT # Print register bitfields in debug
# output. Adds ~215k to driver.


device isa
device pci

#sound card support in kernel.
device pcm

#to support mplayer
options CPU_ENABLE_SSE
options USER_LDT

# Floppy drives
device fdc0 at isa? port IO_FD1 irq 6 drq 2
device fd0 at fdc0 drive 0

#ATAdevice
device ata

# atkbdc0 controls both the keyboard and the PS/2 mouse
device atkbdc0 at isa? port IO_KBD
device atkbd0 at atkbdc? irq 1 flags 0x1
device psm0 at atkbdc? irq 12

device vga0 at isa?

options VESA

# splash screen/screen saver
pseudo-device splash

# syscons is the default console driver, resembling an SCO console
device sc0 at isa? flags 0x100

device agp # support several AGP chipsets

# Floating point support - do not disable.
device npx0 at nexus? port IO_NPX irq 13

# Power management support (see LINT for more options)
device apm0 at nexus? disable flags 0x20 # Advanced Power Management

# Serial (COM) ports
device sio0 at isa? port IO_COM1 flags 0x10 irq 4
device sio1 at isa? port IO_COM2 irq 3

# Parallel port
device ppc0 at isa? irq 7
device ppbus # Parallel port bus (required)
device lpt # Printer
device plip # TCP/IP over parallel
device ppi # Parallel port interface device

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device miibus # MII bus support
device rl # RealTek 8129/8139

# Pseudo devices - the number indicates how many units to allocate.
pseudo-device loop # Network loopback
pseudo-device ether # Ethernet support
pseudo-device ppp 1 # Kernel PPP
pseudo-device tun # Packet tunnel.
pseudo-device pty # Pseudo-ttys (telnet etc)
pseudo-device md # Memory "disks"

# The `bpf' pseudo-device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
pseudo-device bpf 4 #Berkeley packet filter

# USB support
device uhci # UHCI PCI->USB interface
device ohci # OHCI PCI->USB interface
device usb # USB Bus (required)
device ugen # bluebell
device uhid # "Human Interface Devices"
device ulpt # Printer
device umass # Disks/Mass storage - Requires scbus and da
device ums # Mouse
device uscanner # Scanners
device urio # Diamond Rio MP3 Player
**************************************************************************************

请问是什么问题？

请帮忙解答，谢谢。

找到原因：
usb设备的usass是需要scsi的驱动。

最后又改了一点儿，系统重做成功。