yaffs编译出错

zjj20082008

我用的内核是2.4.18，往里添加yaffs时编译出错，各位指点一下
init/main.o init/version.o \
        --start-group \
        arch/arm/kernel/kernel.o arch/arm/mm/mm.o arch/arm/mach-s3c2410/s3c2410.o kernel/kernel.o mm/mm.o fs/fs.o ipc/ipc.o \
         drivers/serial/serial.o drivers/char/char.o drivers/block/block.o drivers/misc/misc.o drivers/net/net.o drivers/media/media.o drivers/scsi/scsidrv.o drivers/sound/sounddrivers.o drivers/mtd/mtdlink.o drivers/net/wireless/wireless_net.o drivers/video/video.o drivers/usb/usbdrv.o drivers/input/inputdrv.o \
        net/network.o \
        arch/arm/nwfpe/math-emu.o arch/arm/lib/lib.a /home/redhat/neihe2.4/kernel-zjj/lib/lib.a \
        --end-group \
        -o vmlinux
fs/fs.o: In function `yaffs_internal_read_super':
fs/fs.o(.text+0x68f50): undefined reference to `nandmtd_WriteChunkToNAND'
fs/fs.o(.text+0x68f54): undefined reference to `nandmtd_ReadChunkFromNAND'
fs/fs.o(.text+0x68f5: undefined reference to `nandmtd_EraseBlockInNAND'
fs/fs.o(.text+0x68f5c): undefined reference to `nandmtd_InitialiseNAND'
make: *** [vmlinux] Error 1