lfs5.0,严格按照文档操作,在第五章编译Glibc-2.3.2时出现这般错误,如何纠正?

move

LFS5.0
系统版本:Slackware9.1
出错的现场:

make  -C stdio-common subdir_lib
make[2]: Entering directory `/mnt/lfs/sources/glibc-2.3.2/stdio-common'
gcc -B/tools/bin/ sscanf.c -c -std=gnu99 -O2 -Wall -Winline -Wstrict-prototypes
-Wwrite-strings -g      -I../include -I. -I/mnt/lfs/sources/glibc-build/stdio-common -I.. -I../libio  -I/mnt/lfs/sources/glibc-build -I../sysdeps/i386/elf -I../linuxthreads/sysdeps/unix/sysv/linux/i386 -I../linuxthreads/sysdeps/unix/sysv/linux -I../linuxthreads/sysdeps/pthread -I../sysdeps/pthread -I../linuxthreads/sysdeps/unix/sysv -I../linuxthreads/sysdeps/unix -I../linuxthreads/sysdeps/i386/i686 -I../linuxthreads/sysdeps/i386 -I../sysdeps/unix/sysv/linux/i386 -I../sysdeps/unix/sysv/linux -I../sysdeps/gnu -I../sysdeps/unix/common -I../sysdeps/unix/mman -I../sysdeps/unix/inet -I../sysdeps/unix/sysv/i386 -I../sysdeps/unix/sysv -I../sysdeps/unix/i386 -I../sysdeps/unix -I../sysdeps/posix -I../sysdeps/i386/i686/fpu -I../sysdeps/i386/i686 -I../sysdeps/i386/i486 -I../sysdeps/i386/fpu -I../sysdeps/i386 -I../sysdeps/wordsize-32 -I../sysdeps/ieee754/ldbl-96 -I../sysdeps/ieee754/dbl-64 -I../sysdeps/ieee754/flt-32 -I../sysdeps/ieee754 -I../sysdeps/generic/elf -I../sysdeps/generic  -nostdinc -isystem /tools/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/include -isystem /tools/include -D_LIBC_REENTRANT -include ../include/libc-symbols.h       -D_IO_MTSAFE_IO -o /mnt/lfs/sources/glibc-build/stdio-common/sscanf.o
sscanf.c:31: warning: conflicting types for built-in function `sscanf'
sscanf.c: In function `sscanf':
sscanf.c:37: error: `va_start' used in function with fixed args
../stdio-common/_itoa.h: At top level:
../stdio-common/_itoa.h:40: warning: inlining failed in call to `_itoa_word'
../stdio-common/_itoa.h:76: warning: called from here
make[2]: *** [/mnt/lfs/sources/glibc-build/stdio-common/sscanf.o] Error 1
make[2]: Leaving directory `/mnt/lfs/sources/glibc-2.3.2/stdio-common'
make[1]: *** [stdio-common/subdir_lib] Error 2
make[1]: Leaving directory `/mnt/lfs/sources/glibc-2.3.2'
make: *** [all] Error 2
bash-2.05b$