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diff --git a/gr-qtgui/lib/sink_f_impl.h b/gr-qtgui/lib/sink_f_impl.h
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+++ b/gr-qtgui/lib/sink_f_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2009,2011,2012 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_QTGUI_SINK_F_IMPL_H
+#define INCLUDED_QTGUI_SINK_F_IMPL_H
+
+#include <qtgui/sink_f.h>
+#include <filter/firdes.h>
+#include <fft/fft.h>
+#include <gruel/high_res_timer.h>
+#include <SpectrumGUIClass.h>
+
+namespace gr {
+  namespace qtgui {
+
+    class QTGUI_API sink_f_impl : public sink_f
+    {
+    private:
+      void forecast(int noutput_items, gr_vector_int &ninput_items_required);
+
+      void initialize();
+
+      int d_fftsize;
+      filter::firdes::win_type d_wintype;
+      std::vector<float> d_window;
+      double d_center_freq;
+      double d_bandwidth;
+      std::string d_name;
+
+      bool d_shift;
+      fft::fft_complex *d_fft;
+
+      int d_index;
+      float *d_residbuf;
+      float *d_magbuf;
+
+      bool d_plotfreq, d_plotwaterfall, d_plottime, d_plotconst;
+
+      double d_update_time;
+
+      QWidget *d_parent;
+      SpectrumGUIClass *d_main_gui;
+
+      void windowreset();
+      void buildwindow();
+      void fftresize();
+      void fft(float *data_out, const float *data_in, int size);
+
+    public:
+      sink_f_impl(int fftsize, int wintype,
+		  double fc, double bw,
+		  const std::string &name,
+		  bool plotfreq, bool plotwaterfall,
+		  bool plottime, bool plotconst,
+		  QWidget *parent);
+      ~sink_f_impl();
+
+      void exec_();
+      QWidget*  qwidget();
+      PyObject* pyqwidget();
+
+      void set_fft_size(const int fftsize);
+      int fft_size() const;
+
+      void set_frequency_range(const double centerfreq,
+			       const double bandwidth);
+      void set_fft_power_db(double min, double max);
+
+      //void set_time_domain_axis(double min, double max);
+      //void set_constellation_axis(double xmin, double xmax,
+      //                            double ymin, double ymax);
+      //void set_constellation_pen_size(int size);
+
+      void set_update_time(double t);
+
+      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 qtgui */
+} /* namespace gr */
+
+#endif /* INCLUDED_QTGUI_SINK_F_IMPL_H */