problem with __builtin_expect( int, int ) function -

[bemis]

libc  has not build on our system for over a week now because of the
following error.
  On alphas what would happen if the function __builtin_expect( int, int
) to two zeros as it's arguments from the file iconv/loop.c???
I am getting a division by zero error, and was wondering if this could
be the cause of the error??

the following is the output from my make attempt:
In file included from cp1258.c:491:
../iconv/loop.c:299:66: division by zero in #if
In file included from cp1258.c:862:
../iconv/loop.c:299:66: division by zero in #if
make[2]: ***
[/mnt/u9/toolchain/buildsys/build/alpha9/bootstrap-gcc_3.0.4/native
/libc/iconvdata/cp1258.os] Error 1
make[2]: Leaving directory
`/mnt/u9/toolchain/buildsys/source/libc/iconvdata'
make[1]: *** [iconvdata/others] Error 2
make[1]: Leaving directory `/mnt/u9/toolchain/buildsys/source/libc'
make: *** [all] Error 2
any help would be much appreciated!
thanks
Matt Bemis