#ifdef CHECK_FUNCTION_EXISTS

char CHECK_FUNCTION_EXISTS();
#ifdef __CLASSIC_C__
int main() {
  int ac;
  char* av[];
#else
int main(int ac, char* av[]) {
#endif
  CHECK_FUNCTION_EXISTS();
  if (ac > 1000) {
    return *av[0];
  }
  return 0;
}

#else /* CHECK_FUNCTION_EXISTS */

#error "CHECK_FUNCTION_EXISTS has to specify the function"

#endif /* CHECK_FUNCTION_EXISTS */
