-#ifdef EXPERIMENTAL_ARC
-# ifdef SUPPORT_DMARC
-extern gstring *arc_dmarc_hist_append(gstring *);
-# endif
-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