extern void readconf_driver_init(uschar *, driver_instance **,
driver_info *, int, void *, int, optionlist *, int);
extern uschar *readconf_find_option(void *);
extern void readconf_driver_init(uschar *, driver_instance **,
driver_info *, int, void *, int, optionlist *, int);
extern uschar *readconf_find_option(void *);