LFS编译临时系统binutils出现错误

错误如下：

In file included from /usr/include/asm/sigcontext.h:5,

                 from /opt/mylinux/tools/bin/../lib/gcc/../../include/bits/sigcontext.h:28,

                 from /opt/mylinux/tools/bin/../lib/gcc/../../include/signal.h:339,

                 from ../../binutils-2.21.1/bfd/trad-core.c:43:

/opt/mylinux/tools/bin/../lib/gcc/../../include/linux/types.h:13:2: error: #warning "Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders"

make[4]: *** [trad-core.lo] 错误 1

make[4]:正在离开目录 `/opt/mylinux/build/binutils/bfd'

make[3]: *** [all-recursive] 错误 1

make[3]:正在离开目录 `/opt/mylinux/build/binutils/bfd'

make[2]: *** [all] 错误 2

make[2]:正在离开目录 `/opt/mylinux/build/binutils/bfd'

make[1]: *** [all-bfd] 错误 2

make[1]:正在离开目录 `/opt/mylinux/build/binutils'

make: *** [all] 错误 2

kernel头文件是3.0.1

gcc 是4.3.5

ld 是2.20