+#ifdef VIK_CONFIG_GEOTAG
+extern VikDataSourceInterface vik_datasource_geotag_interface;
+#endif
+#ifdef VIK_CONFIG_GEONAMES
+extern VikDataSourceInterface vik_datasource_wikipedia_interface;
+#endif
+extern VikDataSourceInterface vik_datasource_url_interface;
+extern VikDataSourceInterface vik_datasource_geojson_interface;
+
+G_END_DECLS
+