diff --git a/cmake/modules/FindQwt.cmake b/cmake/modules/FindQwt.cmake
index e52243f38..e975d7b4b 100644
--- a/cmake/modules/FindQwt.cmake
+++ b/cmake/modules/FindQwt.cmake
@@ -36,13 +36,6 @@
 SET(QWT_FOUND "NO")
 
 FIND_PATH(QWT_INCLUDE_DIR qwt.h
-  /usr/local/qwt/include
-  /usr/local/include
-  /usr/include/qwt
-  /usr/include/qwt-qt4
-  /usr/include/qwt5
-  /usr/include
-  /opt/local/include/qwt #macports path
   $ENV{QWT_DIR}/include
   $ENV{QWT_DIR}/src
   $ENV{QWTDIR}/include
@@ -51,6 +44,13 @@ FIND_PATH(QWT_INCLUDE_DIR qwt.h
   $ENV{QWT_ROOT}/src
   $ENV{QWTROOT}/include
   $ENV{QWTROOT}/src
+  /usr/local/qwt/include
+  /usr/local/include
+  /usr/include/qwt
+  /usr/include/qwt-qt4
+  /usr/include/qwt5
+  /usr/include
+  /opt/local/include/qwt #macports path
 )
 
 SET(QWT_INCLUDE_DIRS ${QWT_INCLUDE_DIR})
@@ -82,8 +82,16 @@ IF( Qwt_FIND_VERSION AND QWT_VERSION_STRING )
   ENDIF()
 ENDIF()
 
-SET(POTENTIAL_LIBRARY_PATHS /usr/local/qwt/lib /usr/local/lib /usr/lib /opt/local/lib
-              $ENV{QWT_DIR}/lib $ENV{QWTDIR}/lib $ENV{QWT_ROOT}/lib $ENV{QWTROOT}/lib)
+SET(POTENTIAL_LIBRARY_PATHS 
+        $ENV{QWT_DIR}/lib 
+	$ENV{QWTDIR}/lib 
+	$ENV{QWT_ROOT}/lib 
+	$ENV{QWTROOT}/lib
+	/usr/local/qwt/lib 
+	/usr/local/lib /usr/lib 
+	/opt/local/lib
+
+)
               
 SET(QWT_NAMES ${QWT_NAMES} qwt qwt-qt4 qwt5 )
 FIND_LIBRARY(QWT_LIBRARY
diff --git a/graphics/lib/common/Lineplot.cpp b/graphics/lib/common/Lineplot.cpp
index 0f0c298ce..97f47f0c7 100644
--- a/graphics/lib/common/Lineplot.cpp
+++ b/graphics/lib/common/Lineplot.cpp
@@ -33,6 +33,8 @@
 
 #include "Lineplot.h"
 
+#include "qwt_scale_div.h"
+#include "qwt_plot_canvas.h"
 #include <algorithm>
 
 class MyZoomer: public QwtPlotZoomer
@@ -94,7 +96,8 @@ Lineplot::Lineplot(QWidget *parent)
   axisScaleEngine(QwtPlot::yLeft)->setAttribute(QwtScaleEngine::Floating,true);
   axisScaleEngine(QwtPlot::yRight)->setAttribute(QwtScaleEngine::Floating,true);
 
-  zoomer_ = new MyZoomer(canvas());
+  QwtPlotCanvas *mycanvas = qobject_cast<QwtPlotCanvas*>(canvas());
+  zoomer_ = new MyZoomer(mycanvas);
   zoomer_->setMousePattern(QwtEventPattern::MouseSelect1, Qt::LeftButton);
   zoomer_->setMousePattern(QwtEventPattern::MouseSelect2, Qt::LeftButton,
                            Qt::ControlModifier);
@@ -160,5 +163,5 @@ void Lineplot::resetZoom()
 
 void Lineplot::linkScales()
 {
-  setAxisScaleDiv(QwtPlot::yRight, *axisScaleDiv(QwtPlot::yLeft));
+//  setAxisScaleDiv(QwtPlot::yRight, *axisScaleDiv(QwtPlot::yLeft));
 }
diff --git a/graphics/lib/common/Pointplot.cpp b/graphics/lib/common/Pointplot.cpp
index b706851d1..b4ac76047 100644
--- a/graphics/lib/common/Pointplot.cpp
+++ b/graphics/lib/common/Pointplot.cpp
@@ -32,6 +32,7 @@
  */
 
 #include "Pointplot.h"
+#include "qwt_plot_canvas.h"
 #include <algorithm>
 
 using namespace std;
@@ -83,7 +84,8 @@ Pointplot::Pointplot(QWidget *parent)
   memset(realPoints_, 0x0, numPoints_*sizeof(double));
   memset(imagPoints_, 0x0, numPoints_*sizeof(double));
 
-  zoomer_ = new MyZoomer(canvas());
+  QwtPlotCanvas *mycanvas = qobject_cast<QwtPlotCanvas*>(canvas());
+  zoomer_ = new MyZoomer(mycanvas);
   zoomer_->setMousePattern(QwtEventPattern::MouseSelect1, Qt::LeftButton);
   zoomer_->setMousePattern(QwtEventPattern::MouseSelect2, Qt::LeftButton,
                            Qt::ControlModifier);
diff --git a/graphics/lib/common/Spectrogramplot.cpp b/graphics/lib/common/Spectrogramplot.cpp
index 6a6433dba..a28b97e6b 100644
--- a/graphics/lib/common/Spectrogramplot.cpp
+++ b/graphics/lib/common/Spectrogramplot.cpp
@@ -36,6 +36,7 @@
 #include <qprinter.h>
 #include <qprintdialog.h>
 #include <qwt_color_map.h>
+#include <qwt_plot_canvas.h>
 #include <qwt_plot_spectrogram.h>
 #include <qwt_scale_widget.h>
 #include <qwt_scale_draw.h>
@@ -116,7 +117,8 @@ Spectrogramplot::Spectrogramplot(int numDataPoints, int numRows, QWidget *parent
   // RightButton: zoom out by 1
   // Ctrl+RighButton: zoom out to full size
 
-  zoomer_ = new MyZoomer(canvas());
+  QwtPlotCanvas *mycanvas = qobject_cast<QwtPlotCanvas*>(canvas());
+  zoomer_ = new MyZoomer(mycanvas);
   zoomer_->setMousePattern(QwtEventPattern::MouseSelect1,
       Qt::LeftButton);
   zoomer_->setMousePattern(QwtEventPattern::MouseSelect2,