errno bug?

[E. Robert Tisdale]

        > cat main.cc
        #include <stdio.h>
        #include <errno.h>

        extern int errno;

        int main(int argc, char* argv[]) {
          return 0;
          }

        > g++ -Wall -ansi -pedantic -o main main.cc
        main.cc:4: error: declaration of `int* __errno_location()' \
        throws different exceptions
        /usr/include/bits/errno.h:38: error: \
        than previous declaration `int* __errno_location() throw ()'
        > g++ --version
        g++ (GCC) 3.4.1
        > cat /etc/fedora-release
        Fedora Core release 2 (Tettnang)