+osgDB::RegisterReaderWriterProxy<simgear::ReaderWriterSTG> g_readerWriterSTGProxy;
+simgear::ModelRegistryCallbackProxy<simgear::LoadOnlyCallback> g_stgCallbackProxy("stg");
+
+osgDB::RegisterReaderWriterProxy<simgear::ReaderWriterSPT> g_readerWriterSPTProxy;
+simgear::ModelRegistryCallbackProxy<simgear::LoadOnlyCallback> g_sptCallbackProxy("spt");
+}
+