#ifdef SUPPORT_TLS
+extern const char *
+ std_dh_prime_default(void);
+extern const char *
+ std_dh_prime_named(const uschar *);
extern int tls_client_start(int, host_item *, address_item *, uschar *,
uschar *, uschar *, uschar *, uschar *, uschar *, uschar *,
int);