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diff --git a/ext/systemc/src/sysc/kernel/sc_constants.h b/ext/systemc/src/sysc/kernel/sc_constants.h
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+/*****************************************************************************
+
+  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_constants.h -- Default constants whose values may need to be
+                    changed depending on the application.
+
+  Original Author: Ali Dasdan, Synopsys, Inc.
+
+  CHANGE LOG AT THE END OF THE FILE
+ *****************************************************************************/
+
+#ifndef SC_CONSTANTS_H
+#define SC_CONSTANTS_H
+
+namespace sc_core {
+
+// Maximum number of bits for arbitrary precision arithmetic. If
+// defined, the arithmetic becomes faster. If not defined, the
+// arithmetic becomes slower and the precision becomes infinite.  It
+// is a good idea to define this constant as a multiple of
+// BITS_PER_DIGIT, which is defined in numeric_bit/sc_nbdefs.h.
+//#define SC_MAX_NBITS    510    // 17 * BITS_PER_DIGIT
+
+
+// deprecated in 1666-2005 and later, but kept for backwards compatibility
+//  - can be set by defining SC_OVERRIDE_DEFAULT_STACK_SIZE
+//  - defaults defined in sc_thread_process.cpp
+extern const int SC_DEFAULT_STACK_SIZE;
+
+
+#ifdef DEBUG_SYSTEMC
+const int SC_MAX_NUM_DELTA_CYCLES = 10000;
+#endif
+
+} // namespace sc_core
+
+// $Log: sc_constants.h,v $
+// Revision 1.7  2011/08/26 20:46:09  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 1.6  2011/02/18 20:33:26  acg
+//  Philipp A. Hartmann: added default stack size for CYGWIN32.
+//
+// Revision 1.5  2011/02/18 20:27:14  acg
+//  Andy Goodrich: Updated Copyrights.
+//
+// Revision 1.4  2011/02/13 21:47:37  acg
+//  Andy Goodrich: update copyright notice.
+//
+// Revision 1.3  2010/03/15 18:29:25  acg
+//  Andy Goodrich: Changed the default stack size to 128K from 64K.
+//
+// Revision 1.2  2008/05/22 17:06:24  acg
+//  Andy Goodrich: updated copyright notice to include 2008.
+//
+// Revision 1.1.1.1  2006/12/15 20:20:05  acg
+// SystemC 2.3
+//
+// Revision 1.3  2006/01/13 18:44:29  acg
+// Added $Log to record CVS changes into the source.
+//
+
+#endif