-void a_acquire ( VikWindow *vw, VikLayersPanel *vlp, VikViewport *vvp, VikDataSourceInterface *source_interface ) {
- acquire ( vw, vlp, vvp, source_interface, NULL, NULL );
+void a_acquire ( VikWindow *vw, VikLayersPanel *vlp, VikViewport *vvp, VikDataSourceInterface *source_interface,
+ gpointer userdata, VikDataSourceCleanupFunc cleanup_function )
+{
+ acquire ( vw, vlp, vvp, source_interface, NULL, NULL, userdata, cleanup_function );