-extern int rda_interpret(redirect_block *, int, uschar *, uschar *, ugid_block *,
- address_item **, uschar **, error_block **, int *, uschar *);
+#ifdef WITH_CONTENT_SCAN
+extern int recv_line(int, uschar *, int);
+#endif
+extern int rda_interpret(redirect_block *, int, uschar *, uschar *,
+ uschar *, uschar *, ugid_block *, address_item **, uschar **,
+ error_block **, int *, uschar *);