extern uschar *b64encode(uschar *, int);
extern int b64decode(uschar *, uschar **);
extern int bdat_getc(unsigned);
+extern int bdat_ungetc(int);
extern void bdat_flush_data(void);
extern void bits_clear(unsigned int *, size_t, int *);
extern BOOL directory_make(const uschar *, const uschar *, int, BOOL);
#ifndef DISABLE_DKIM
extern BOOL dkim_transport_write_message(int, transport_ctx *,
- struct ob_dkim *);
+ struct ob_dkim *, const uschar ** errstr);
#endif
extern dns_address *dns_address_from_rr(dns_answer *, dns_record *);
extern int dns_basic_lookup(dns_answer *, const uschar *, int);