extern void auth_heimdal_gssapi_init(auth_instance *);
extern int auth_heimdal_gssapi_server(auth_instance *, uschar *);
extern int auth_heimdal_gssapi_client(auth_instance *, void *, int, uschar *, int);
extern void auth_heimdal_gssapi_init(auth_instance *);
extern int auth_heimdal_gssapi_server(auth_instance *, uschar *);
extern int auth_heimdal_gssapi_client(auth_instance *, void *, int, uschar *, int);