sscanf.c doens't compile and make aborts

[angico]

i'm trying to build glibc-2.3.2, for a general upgrade on my system.
'configure' ran fine, but make aborts during compilation of sscanf due
to error in the call to va_start.
can you tell me what is going on? How do i solve the problem?
many thanks in advance,
angico.

My system:
    linux 2.6.1
    make 3.79.1
    gcc 3.3.2
    glibc 2.2.2

The error message:
gcc sscanf.c -c -std=gnu99 -O2 -Wall -Winline -Wstrict-prototypes
-Wwrite-strings -g      -I../include -I.
-I/home/angico/dl/glibc/0/stdio-common -I.. -I../libio 
-I/home/angico/dl/glibc/0 -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/i586 -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/i586 -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   -D_LIBC_REENTRANT
-include ../include/libc-symbols.h       -D_IO_MTSAFE_IO -o
/home/angico/dl/glibc/0/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
make[2]: *** [/home/angico/dl/glibc/0/stdio-common/sscanf.o] Error 1
make[2]: Leaving directory
`/home/angico/dl/glibc/glibc-2.3.2/stdio-common'
make[1]: *** [stdio-common/subdir_lib] Error 2
make[1]: Leaving directory `/home/angico/dl/glibc/glibc-2.3.2'
make: *** [all] Error 2


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