diff --git a/bora/src/SlicingPlotWidget.cpp b/bora/src/SlicingPlotWidget.cpp
index 8959dc90..77272237 100644
--- a/bora/src/SlicingPlotWidget.cpp
+++ b/bora/src/SlicingPlotWidget.cpp
@@ -1,7 +1,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC 2015-2018, All Rights Reserved
+// Copyright (c) Sorbonne Université 2015-2023, All Rights Reserved
 //
 // +-----------------------------------------------------------------+ 
 // |                   C O R I O L I S                               |
@@ -81,11 +81,20 @@ namespace Bora {
     : QWidget        (parent)
     , _viewer        (NULL)
     , _plot          (new QwtPlot      ())
+#if QWT_VERSION < 0x060000
+    , _picker        (new QwtPlotPicker( QwtPlot::xBottom           // X Axis id.
+                                       , QwtPlot::yLeft             // Y Axis id. 
+                                       , QwtPicker::PointSelection
+                                       , QwtPicker::CrossRubberBand
+                                       , QwtPicker::ActiveOnly
+                                       , _plot->canvas()) )
+#else
     , _picker        (new QwtPlotPicker( QwtPlot::xBottom           // X Axis id.
                                        , QwtPlot::yLeft             // Y Axis id. 
                                        , QwtPicker::CrossRubberBand
                                        , QwtPicker::ActiveOnly
                                        , _plot->canvas()) )
+#endif
     , _gridDisplay   (new QGridLayout()) 
     , _gridLabel     ()                                             // Label line 2: text
     , _widths        (NULL)                                         // Coordinates X for STreeCurve
@@ -97,7 +106,9 @@ namespace Bora {
     , _paretoCurve   (new QwtPlotCurve("Pareto"))                   // Black curve: pareto curve
     , _selectedPoint (new QwtPlotCurve("Selected"))                 // Red dot    : selected placement
   {
+#if QWT_VERSION >= 0x060000
     _picker->setStateMachine(new QwtPickerClickPointMachine());
+#endif
     setStyleSheet ( "border: 0px" );
 
     int ptSize = Graphics::isHighDpi() ? 2 : 2;
@@ -134,7 +145,11 @@ namespace Bora {
     symbol->setStyle( QwtSymbol::Triangle );
     symbol->setSize ( 6 );
     symbol->setPen  ( dotPen );
+#if QWT_VERSION < 0x060000
+    _STreeCurve->setSymbol( *symbol );
+#else
     _STreeCurve->setSymbol( symbol );
+#endif
 
     QPen selectPen ( Qt::red );
     selectPen.setWidth( ptSize+2 );
@@ -142,7 +157,11 @@ namespace Bora {
     _selectedPoint->setPen  ( selectPen );
     _selectedPoint->attach  ( _plot );
 
+#if QWT_VERSION < 0x060000
+    connect( _picker, SIGNAL(selected(const QwtDoublePoint&)), this, SLOT(onPointSelect(const QwtDoublePoint&)) );
+#else
     connect( _picker, SIGNAL(selected(const QPointF&)), this, SLOT(onPointSelect(const QPointF&)) );
+#endif
 
     QVBoxLayout* vLayout = new QVBoxLayout();
     vLayout->addWidget ( _plot );
@@ -270,8 +289,13 @@ namespace Bora {
       i++;
     }
 
+#if QWT_VERSION < 0x060000
+    _STreeCurve->setData ( _widths     , _heights    , nodeSets->size() );
+    _paretoCurve->setData( _pareto.xs(), _pareto.ys(), _pareto.size()  );
+#else
     _STreeCurve->setSamples ( _widths     , _heights    , nodeSets->size() );
     _paretoCurve->setSamples( _pareto.xs(), _pareto.ys(), _pareto.size()  );
+#endif
     _STreeCurve->show();
     _paretoCurve->show();
     _plot->replot();
@@ -312,7 +336,11 @@ namespace Bora {
   }
 
 
+#if QWT_VERSION < 0x060000
+  void  SlicingPlotWidget::onPointSelect ( const QwtDoublePoint& point )
+#else
   void  SlicingPlotWidget::onPointSelect ( const QPointF& point )
+#endif
   {
   // Clicking on SlicingTree's Pareto Graph:
   // 1) Update slicing tree
@@ -329,8 +357,13 @@ namespace Bora {
     cdebug.log(539) << "  Selection: [" << point.x() << " " << point.y() << "]" << endl;
 
     if ( (iclosest >= 0) and (iclosest < dataSize) ) {
+#if QWT_VERSION < 0x060000
+      double x = _STreeCurve->x( iclosest );
+      double y = _STreeCurve->y( iclosest );
+#else
       double x = _STreeCurve->sample( iclosest ).x();
       double y = _STreeCurve->sample( iclosest ).y();
+#endif
 
       ostringstream message;
       message << "(" << DbU::getValueString(x) << "," << DbU::getValueString(y) << ")";
@@ -373,7 +406,11 @@ namespace Bora {
     _widthSelected [0] = x;
     _heightSelected[0] = y;
 
+#if QWT_VERSION < 0x060000
+    _selectedPoint->setData ( _widthSelected, _heightSelected, 1 );
+#else
     _selectedPoint->setSamples ( _widthSelected, _heightSelected, 1 );
+#endif
     _selectedPoint->show();
     _plot->replot();
 
diff --git a/bora/src/bora/SlicingPlotWidget.h b/bora/src/bora/SlicingPlotWidget.h
index ac2ad24d..c0ade9d4 100644
--- a/bora/src/bora/SlicingPlotWidget.h
+++ b/bora/src/bora/SlicingPlotWidget.h
@@ -1,7 +1,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC 2015-2018, All Rights Reserved
+// Copyright (c) Sorbonne Université 2015-2023, All Rights Reserved
 //
 // +-----------------------------------------------------------------+ 
 // |                   C O R I O L I S                               |
@@ -10,13 +10,11 @@
 // |  Authors     :          Jean-Paul Chaput, Eric LAO              |
 // |  E-mail      :            Jean-Paul.Chaput@lip6.fr              |
 // | =============================================================== |
-// |  C++ Header  :  "./bora/DSlicingNode.h"                         |
+// |  C++ Header  :  "./bora/SlicingPlotWidget.h"                    |
 // +-----------------------------------------------------------------+
 
 
-#ifndef  BORA_SLICING_PLOT_WIDGET_H
-#define  BORA_SLICING_PLOT_WIDGET_H
-
+#pragma once
 //Work sround for older qwt releases
 #include <QtGlobal>
 #if QT_VERSION >= 0x050400
@@ -55,7 +53,11 @@ namespace Bora {
                void  setViewer           ( CellViewer* );
                void  setDatas            ();
     public slots:
+#if QWT_VERSION < 0x060000
+               void  onPointSelect       ( const QwtDoublePoint& );
+#else
                void  onPointSelect       ( const QPointF& );
+#endif
                void  updateSelectedPoint ( double x, double y );
     signals:
                void  updatePlacement     ( BoxSet* );
@@ -78,5 +80,3 @@ namespace Bora {
 
 
 } // Bora namespace.
-
-#endif  // BORA_SLICING_PLOT_WIDGET_H