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diff --git a/src/libpcp_qwt/src/qwt_plot_zoomer.h b/src/libpcp_qwt/src/qwt_plot_zoomer.h
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+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_PLOT_ZOOMER_H
+#define QWT_PLOT_ZOOMER_H
+
+#include "qwt_global.h"
+#include "qwt_plot_picker.h"
+#include <qstack.h>
+
+/*!
+  \brief QwtPlotZoomer provides stacked zooming for a plot widget
+
+  QwtPlotZoomer offers rubberband selections on the plot canvas,
+  translating the selected rectangles into plot coordinates and
+  adjusting the axes to them. Zooming can repeated as often as
+  possible, limited only by maxStackDepth() or minZoomSize().
+  Each rectangle is pushed on a stack.
+
+  Zoom rectangles can be selected depending on selectionFlags() using the
+  mouse or keyboard (QwtEventPattern, QwtPickerMachine).
+  QwtEventPattern::MouseSelect3,QwtEventPattern::KeyUndo,
+  or QwtEventPattern::MouseSelect6,QwtEventPattern::KeyRedo
+  walk up and down the zoom stack.
+  QwtEventPattern::MouseSelect2 or QwtEventPattern::KeyHome unzoom to
+  the initial size.
+
+  QwtPlotZoomer is tailored for plots with one x and y axis, but it is
+  allowed to attach a second QwtPlotZoomer for the other axes.
+
+  \note The realtime example includes an derived zoomer class that adds
+        scrollbars to the plot canvas.
+*/
+
+class QWT_EXPORT QwtPlotZoomer: public QwtPlotPicker
+{
+    Q_OBJECT
+public:
+    explicit QwtPlotZoomer( QwtPlotCanvas *, bool doReplot = true );
+    explicit QwtPlotZoomer( int xAxis, int yAxis,
+                            QwtPlotCanvas *, bool doReplot = true );
+
+    virtual ~QwtPlotZoomer();
+
+    virtual void setZoomBase( bool doReplot = true );
+    virtual void setZoomBase( const QRectF & );
+
+    QRectF zoomBase() const;
+    QRectF zoomRect() const;
+
+    virtual void setAxis( int xAxis, int yAxis );
+
+    void setMaxStackDepth( int );
+    int maxStackDepth() const;
+
+    const QStack<QRectF> &zoomStack() const;
+    void setZoomStack( const QStack<QRectF> &,
+        int zoomRectIndex = -1 );
+
+    uint zoomRectIndex() const;
+
+public Q_SLOTS:
+    void moveBy( double x, double y );
+    virtual void moveTo( const QPointF & );
+
+    virtual void zoom( const QRectF & );
+    virtual void zoom( int up );
+
+Q_SIGNALS:
+    /*!
+      A signal emitting the zoomRect(), when the plot has been
+      zoomed in or out.
+
+      \param rect Current zoom rectangle.
+    */
+
+    void zoomed( const QRectF &rect );
+
+protected:
+    virtual void rescale();
+
+    virtual QSizeF minZoomSize() const;
+
+    virtual void widgetMouseReleaseEvent( QMouseEvent * );
+    virtual void widgetKeyPressEvent( QKeyEvent * );
+
+    virtual void begin();
+    virtual bool end( bool ok = true );
+    virtual bool accept( QPolygon & ) const;
+
+private:
+    void init( bool doReplot );
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif