内核编译make dep出错

我在make menuconfig配置完成之后，执行make dep出现如下错误：

gcc -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -o scripts/mkdep scripts/mkdep.c
make -C arch/ppc/boot fastdep
make[1]: Entering directory `/home/sunl/linux/arch/ppc/boot'
/home/sunl/linux/scripts/mkdep *.[Sch] > .depend
make[1]: Leaving directory `/home/sunl/linux/arch/ppc/boot'
make -C arch/ppc/chrpboot fastdep
make[1]: Entering directory `/home/sunl/linux/arch/ppc/chrpboot'
/home/sunl/linux/scripts/mkdep *.[Sch] > .depend
make[1]: Leaving directory `/home/sunl/linux/arch/ppc/chrpboot'
scripts/mkdep -- init/*.c > .depend
scripts/mkdep -- `find /home/sunl/linux/include/asm /home/sunl/linux/include/linux /home/sunl/linux/include/scsi /home/sunl/linux/include/net -name SCCS -prune -o -follow -name \*.h ! -name modversions.h -print` > .hdepend
make _sfdep_kernel _sfdep_drivers _sfdep_mm _sfdep_fs _sfdep_net _sfdep_ipc _sfdep_lib _sfdep_arch/ppc/kernel _sfdep_arch/ppc/mm _sfdep_arch/ppc/lib _sfdep_arch/ppc/xmon _sfdep_arch/ppc/8xx_io _FASTDEP_ALL_SUB_DIRS="kernel drivers mm fs net ipc lib arch/ppc/kernel arch/ppc/mm arch/ppc/lib arch/ppc/xmon arch/ppc/8xx_io"
make[1]: Entering directory `/home/sunl/linux'
make -C kernel fastdep
make[2]: Entering directory `/home/sunl/linux/kernel'
/home/sunl/linux/scripts/mkdep -D__KERNEL__ -I/home/sunl/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -D__powerpc__ -fsigned-char -msoft-float -pipe -ffixed-r2 -Wno-uninitialized -mmultiple -mstring -mcpu=860 -I../8xx_io  -- acct.c capability.c context.c dma.c exec_domain.c exit.c fork.c info.c itimer.c kmod.c ksyms.c module.c panic.c pm.c printk.c ptrace.c resource.c sched.c signal.c softirq.c sys.c sysctl.c time.c timer.c uid16.c user.c > .depend
realpath(../8xx_io) failed, No such file or directory
make[2]: *** [fastdep] Error 1
make[2]: Leaving directory `/home/sunl/linux/kernel'
make[1]: *** [_sfdep_kernel] Error 2
make[1]: Leaving directory `/home/sunl/linux'
make: *** [dep-files] Error 2

内核版本是linux-2.4.4
不知道是什么原因造成了这样的错误，请大家帮忙！谢谢！我用的是linux-2.4.4内核