+// include the next line in an attempt to increase stability
+// it seems to make things much *less* stable on MS Windows
+#ifndef _WIN32
+#ifdef __ETL_HAS_LIBPTHREAD
+#define __ETL_LOCK_REFCOUNTS
+#endif
+#endif
+
+#ifdef __ETL_LOCK_REFCOUNTS
+# include "mutex"
+#endif
+