extern BOOL expand_check_condition(uschar *, uschar *, uschar *);
extern uschar *expand_string(uschar *); /* public, cannot make const */
extern const uschar *expand_cstring(const uschar *); /* ... so use this one */
+extern uschar *expand_hide_passwords(uschar * );
extern uschar *expand_string_copy(const uschar *);
extern int_eximarith_t expand_string_integer(uschar *, BOOL);
extern void modify_variable(uschar *, void *);