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diff --git a/src/systemc/ext/channel/sc_clock.hh b/src/systemc/ext/channel/sc_clock.hh
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+++ b/src/systemc/ext/channel/sc_clock.hh
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+/*
+ * Copyright 2018 Google, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __SYSTEMC_EXT_CHANNEL_SC_CLOCK_HH__
+#define __SYSTEMC_EXT_CHANNEL_SC_CLOCK_HH__
+
+#include "../core/sc_time.hh"
+#include "sc_signal.hh"
+
+namespace sc_core
+{
+
+template <class T>
+class sc_in;
+
+class sc_time;
+
+class sc_clock : public sc_signal<bool>
+{
+  public:
+    sc_clock();
+    explicit sc_clock(const char *name);
+
+    sc_clock(const char *name, const sc_time &period,
+             double duty_cycle=0.5, const sc_time &start_time=SC_ZERO_TIME,
+             bool posedge_first=true);
+
+    sc_clock(const char *name, double period_v, sc_time_unit period_tu,
+             double duty_cycle=0.5);
+
+    sc_clock(const char *name, double period_v, sc_time_unit period_tu,
+             double duty_cycle, double start_time_v,
+             sc_time_unit start_time_tu, bool posedge_first=true);
+
+    virtual ~sc_clock();
+
+    virtual void write(const bool &);
+
+    const sc_time &period() const;
+    double duty_cycle() const;
+    const sc_time &start_time() const;
+    bool posedge_first() const;
+
+    virtual const char *kind() const;
+
+  protected:
+    virtual void before_end_of_elaboration();
+
+  private:
+    // Disabled
+    sc_clock(const sc_clock &) : sc_interface(), sc_signal<bool>() {}
+    sc_clock &operator = (const sc_clock &) { return *this; }
+};
+
+typedef sc_in<bool> sc_in_clk;
+
+} // namespace sc_core
+
+#endif  //__SYSTEMC_EXT_CHANNEL_SC_CLOCK_HH__