-extern int auth_heimdal_gssapi_client(auth_instance *, smtp_inblock *,
- smtp_outblock *, int, uschar *, int);
-extern void auth_heimdal_gssapi_version_report(FILE *f);
+extern int auth_heimdal_gssapi_client(auth_instance *, void *, int, uschar *, int);
+extern void auth_heimdal_gssapi_version_report(BOOL);