Index: Compatibility.h
===================================================================
diff -u
--- Compatibility.h	(revision 0)
+++ Compatibility.h	(revision 0980ecacb89bf243bbbcb47fdc63b9630edf02c3)
@@ -0,0 +1,32 @@
+/**************************************************************************
+*
+* Copyright (c) 2019-2021 Diality Inc. - All Rights Reserved.
+*
+* THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
+* WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
+*
+* @file Compatibility.h
+*
+* @author (last) Sean Nash
+* @date (last) 06-May-2021
+*
+* @author (original) Sean Nash
+* @date (original) 06-May-2021
+*
+***************************************************************************/
+
+#ifndef __COMPATIBILITY_H__
+#define __COMPATIBILITY_H__
+
+// ********** public definitions **********
+
+/**
+ *  @addtogroup Compatibility
+ *  @{
+ */
+
+#define COMPATIBILITY_REV       1                       ///< Compatibility revision for all system software stacks.
+
+/**@}*/
+
+#endif