-extern int tls_client_start(int, host_item *, address_item *, uschar *,
- uschar *, uschar *, uschar *, uschar *, uschar *, int);
-extern void tls_close(BOOL);
+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 *,
+# ifdef EXPERIMENTAL_OCSP
+ uschar *,
+# endif
+ int, int, uschar *, uschar *);
+extern void tls_close(BOOL, BOOL);