extern int ipv6_nmtoa(int *, uschar *);
extern uschar *local_part_quote(uschar *);
-extern int log_open_as_exim(uschar *);
+extern int log_open_as_exim(uschar * const);
extern void log_close_all(void);
extern macro_item * macro_create(const uschar *, const uschar *, BOOL);