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diff --git a/gr-pager/lib/flex_sync_impl.h b/gr-pager/lib/flex_sync_impl.h
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+++ b/gr-pager/lib/flex_sync_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_PAGER_FLEX_SYNC_IMPL_H
+#define INCLUDED_PAGER_FLEX_SYNC_IMPL_H
+
+#include <pager/flex_sync.h>
+
+namespace gr {
+  namespace pager {
+
+    class flex_sync_impl : public flex_sync
+    {
+    private:
+      // State machine transitions
+      void enter_idle();
+      void enter_syncing();
+      void enter_sync1();
+      void enter_sync2();
+      void enter_data();
+
+      int index_avg(int start, int end);
+      bool test_sync(unsigned char sym);
+      void parse_fiw();
+      int output_symbol(unsigned char sym);
+
+      // Simple state machine
+      enum state_t { ST_IDLE, ST_SYNCING, ST_SYNC1, ST_SYNC2, ST_DATA };
+      state_t d_state;
+
+      int d_index;    // Index into current baud
+      int d_start;    // Start of good sync
+      int d_center;   // Center of bit
+      int d_end;      // End of good sync
+      int d_count;    // Bit counter
+
+      int d_mode;     // Current packet mode
+      int d_baudrate; // Current decoding baud rate
+      int d_levels;   // Current decoding levels
+      int d_spb;      // Current samples per baud
+      bool d_hibit;   // Alternating bit indicator for 3200 bps
+
+      int d_fiw;      // Frame information word
+      int d_frame;    // Current FLEX frame
+      int d_cycle;    // Current FLEX cycle
+      int d_unknown1;
+      int d_unknown2;
+
+      unsigned char d_bit_a;
+      unsigned char d_bit_b;
+      unsigned char d_bit_c;
+      unsigned char d_bit_d;
+
+      unsigned char *d_phase_a;
+      unsigned char *d_phase_b;
+      unsigned char *d_phase_c;
+      unsigned char *d_phase_d;
+
+      std::vector<int64_t> d_sync; // Trial synchronizers
+
+    public:
+      flex_sync_impl();
+      ~flex_sync_impl();
+
+      void forecast(int noutput_items, gr_vector_int &inputs_required);
+
+      int general_work(int noutput_items,
+		       gr_vector_int &ninput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace pager */
+} /* namespace gr */
+
+#endif /* INCLUDED_PAGER_FLEX_SYNC_IMPL_H */