+
+#ifdef EXPERIMENTAL_ARC
+extern void *arc_ams_setup_sign_bodyhash(void);
+extern const uschar *arc_header_feed(gstring *, BOOL);
+extern gstring *arc_sign(const uschar *, gstring *, uschar **);
+extern void arc_sign_init(void);
+extern const uschar *acl_verify_arc(void);
+extern uschar * fn_arc_domains(void);
+#endif
+