-extern uschar *parse_find_at(uschar *);
-extern const uschar *parse_fix_phrase(const uschar *, int, uschar *, int);
-extern uschar *parse_message_id(uschar *, uschar **, uschar **);
-extern const uschar *parse_quote_2047(const uschar *, int, uschar *, uschar *, int, BOOL);
-extern uschar *parse_date_time(uschar *str, time_t *t);
+extern const uschar *parse_find_at(const uschar *);
+extern const uschar *parse_fix_phrase(const uschar *, int);
+extern const uschar *parse_message_id(const uschar *, uschar **, uschar **);
+extern const uschar *parse_quote_2047(const uschar *, int, uschar *, BOOL);
+extern const uschar *parse_date_time(const uschar *str, time_t *t);
+extern void priv_drop_temp(const uid_t, const gid_t);
+extern void priv_restore(void);