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diff --git a/gr-qtgui/include/qtgui/plot_waterfall.h b/gr-qtgui/include/qtgui/plot_waterfall.h
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+++ b/gr-qtgui/include/qtgui/plot_waterfall.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008-2012 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 PLOT_WATERFALL_H
+#define PLOT_WATERFALL_H
+
+#include <qglobal.h>
+#include <qtgui/waterfallGlobalData.h>
+#include <qwt_plot_rasteritem.h>
+
+#if QWT_VERSION >= 0x060000
+#include <qwt_point_3d.h>  // doesn't seem necessary, but is...
+#include <qwt_compat.h>
+#endif
+
+class QwtColorMap;
+
+/*!
+  \brief A plot item, which displays a waterfall spectrogram
+
+  A waterfall displays threedimenional data, where the 3rd dimension
+  ( the intensity ) is displayed using colors. The colors are calculated
+  from the values using a color map.
+
+  \sa QwtRasterData, QwtColorMap
+*/
+
+class PlotWaterfall: public QwtPlotRasterItem
+{
+public:
+    explicit PlotWaterfall(WaterfallData* data,
+			   const QString &title = QString::null);
+    virtual ~PlotWaterfall();
+
+    const WaterfallData* data()const;
+
+    void setColorMap(const QwtColorMap &);
+
+    const QwtColorMap &colorMap() const;
+
+#if QWT_VERSION < 0x060000
+    virtual QwtDoubleRect boundingRect() const;
+    virtual QSize rasterHint(const QwtDoubleRect &) const;
+#endif
+
+    virtual int rtti() const;
+
+    virtual void draw(QPainter *p,
+		      const QwtScaleMap &xMap,
+		      const QwtScaleMap &yMap,
+		      const QRect &rect) const;
+
+protected:
+#if QWT_VERSION < 0x060000
+    QImage renderImage(const QwtScaleMap &xMap,
+		       const QwtScaleMap &yMap,
+		       const QwtDoubleRect &rect) const;
+#else
+    QImage renderImage(const QwtScaleMap &xMap,
+		       const QwtScaleMap &yMap,
+		       const QRectF &rect,
+		       const QSize &size=QSize(0,0)) const;
+#endif
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif