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diff --git a/ext/systemc/src/sysc/communication/sc_interface.cpp b/ext/systemc/src/sysc/communication/sc_interface.cpp
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+++ b/ext/systemc/src/sysc/communication/sc_interface.cpp
@@ -0,0 +1,100 @@
+/*****************************************************************************
+
+  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
+  more contributor license agreements.  See the NOTICE file distributed
+  with this work for additional information regarding copyright ownership.
+  Accellera licenses this file to you under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with the
+  License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+  implied.  See the License for the specific language governing
+  permissions and limitations under the License.
+
+ *****************************************************************************/
+
+/*****************************************************************************
+
+  sc_interface.cpp -- Abstract base class of all interface classes.
+
+  Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21
+
+  CHANGE LOG IS AT THE END OF THE FILE
+ *****************************************************************************/
+
+#include "sysc/communication/sc_interface.h"
+#include "sysc/communication/sc_communication_ids.h"
+#include "sysc/kernel/sc_event.h"
+
+
+namespace sc_core {
+
+// ----------------------------------------------------------------------------
+//  CLASS : sc_interface
+//
+//  Abstract base class of all interface classes.
+//  BEWARE: Direct inheritance from this class must be done virtual.
+// ----------------------------------------------------------------------------
+
+// register a port with this interface (does nothing by default)
+
+void
+sc_interface::register_port( sc_port_base&, const char* )
+{}
+
+
+// get the default event
+
+const sc_event&
+sc_interface::default_event() const
+{
+    SC_REPORT_WARNING( SC_ID_NO_DEFAULT_EVENT_, 0 );
+    return m_never_notified;
+}
+
+
+// destructor (does nothing)
+
+sc_interface::~sc_interface()
+{}
+
+
+// constructor (does nothing)
+
+sc_interface::sc_interface()
+{}
+
+
+// special event for never notified cases, note the special name to keep
+// it out of the named event structures.
+
+sc_event sc_interface::m_never_notified(SC_KERNEL_EVENT_PREFIX);
+
+} // namespace sc_core
+
+// $Log: sc_interface.cpp,v $
+// Revision 1.5  2011/08/26 20:45:40  acg
+//  Andy Goodrich: moved the modification log to the end of the file to
+//  eliminate source line number skew when check-ins are done.
+//
+// Revision 1.4  2011/03/12 21:07:42  acg
+//  Andy Goodrich: changes to kernel generated event support.
+//
+// Revision 1.3  2011/03/06 15:55:08  acg
+//  Andy Goodrich: Changes for named events.
+//
+// Revision 1.2  2011/02/18 20:23:45  acg
+//  Andy Goodrich: Copyright update.
+//
+// Revision 1.1.1.1  2006/12/15 20:20:04  acg
+// SystemC 2.3
+//
+// Revision 1.3  2006/01/13 18:47:42  acg
+// Added $Log command so that CVS comments are reproduced in the source.
+//
+
+// Taf!