server/mpm/prefork/prefork.c:856: error: UNINITIALIZED_VALUE
  The value read from free_slots[_] was never initialized.

server/mpm/prefork/prefork.c:856:17: 
854.                 }
855. #else
856.                 make_child(ap_server_conf, free_slots[i]);
                     ^
857. #endif /* TPF */
858.             }
