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diff --git a/ext/systemc/src/sysc/tracing/sc_trace_file_base.h b/ext/systemc/src/sysc/tracing/sc_trace_file_base.h
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+++ b/ext/systemc/src/sysc/tracing/sc_trace_file_base.h
@@ -0,0 +1,140 @@
+/*****************************************************************************
+
+  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_trace_file_base.h - Shared internal tracing implementation
+
+  Original Author: Philipp A. Hartmann, OFFIS, 2013-11-15
+
+  CHANGE LOG AT END OF FILE
+ *****************************************************************************/
+
+/*****************************************************************************
+
+   Acknowledgement: The tracing mechanism is based on the tracing
+   mechanism developed at Infineon (formerly Siemens HL). Though this
+   code is somewhat different, and significantly enhanced, the basics
+   are identical to what was originally contributed by Infineon.  The
+   contribution of Infineon in the development of this tracing
+   technology is hereby acknowledged.
+
+ *****************************************************************************/
+
+#ifndef SC_TRACE_FILE_BASE_H_INCLUDED_
+#define SC_TRACE_FILE_BASE_H_INCLUDED_
+
+#include <cstdio>
+
+// use callback-based tracing implementation
+#if defined( SC_ENABLE_SIMULATION_PHASE_CALLBACKS_TRACING )
+#  define SC_TRACING_PHASE_CALLBACKS_ 1
+#  include "sysc/kernel/sc_object.h"
+#else
+#  define SC_TRACING_PHASE_CALLBACKS_ 0
+#endif
+
+#include "sysc/tracing/sc_trace.h"
+#include "sysc/tracing/sc_tracing_ids.h"
+
+namespace sc_core {
+
+// shared implementation of trace files
+class sc_trace_file_base
+  : public sc_trace_file
+#if SC_TRACING_PHASE_CALLBACKS_
+  , private sc_object // to be used as callback target
+#endif
+{
+public:
+    const char* filename() const
+      { return filename_.c_str(); }
+
+    bool delta_cycles() const
+      { return trace_delta_cycles_; }
+
+    // Also trace transitions between delta cycles if flag is true.
+    virtual void delta_cycles(bool flag);
+
+    // set a user-define timescale unit for the trace file
+    virtual void set_time_unit( double v, sc_time_unit tu);
+
+protected:
+    sc_trace_file_base( const char* name, const char* extension );
+
+    // returns true, iff initialization has been performed
+    bool initialize();
+    // ensure that file has been opened (needed for early write_comment())
+    void open_fp();
+    // perform format specific initialization
+    virtual void do_initialize() = 0;
+
+    // returns true, if new trace objects can still be added
+    // (i.e. trace file is not yet initialized)
+    bool add_trace_check( const std::string& name ) const;
+
+    // Flush results and close file.
+    virtual ~sc_trace_file_base();
+
+#if SC_TRACING_PHASE_CALLBACKS_
+private:
+    virtual void simulation_phase_callback();
+#endif // SC_TRACING_PHASE_CALLBACKS_
+
+protected:
+    FILE* fp;                          // pointer to the trace file
+    double      timescale_unit;        // in seconds
+    bool        timescale_set_by_user; // = true means set by user
+
+private:
+    std::string filename_;             // name of the file (for reporting)
+    bool        initialized_;          // tracing started?
+    bool        trace_delta_cycles_;   // also trace delta transitions?
+
+    static bool tracing_initialized_;  // shared setup of tracing implementation
+
+private: // disabled
+    sc_trace_file_base( const sc_trace_file_base& ) /* = delete */;
+    sc_trace_file_base& operator=( const sc_trace_file_base& ) /* = delete */;
+
+}; // class sc_trace_file_base
+
+// -----------------------------------------------------------------------
+
+// Convert double time to 64-bit integer
+
+void double_to_special_int64( double in, unsigned* high, unsigned* low );
+
+// obtain formatted time string
+std::string localtime_string();
+
+} // namespace sc_core
+
+/*****************************************************************************
+
+  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
+  changes you are making here.
+
+      Name, Affiliation, Date:
+  Description of Modification:
+
+ *****************************************************************************/
+
+#endif // SC_TRACE_FILE_BASE_H_INCLUDED_
+// Taf!