QwtPlotCurve : Windows shows curve, Linux curve is missing

I have a main window and in that main window is a qwidget which I promoted to my class based on qwtplot. In the constructor of that class I have defined two arrays which were then added to my plotcurve. When running in Fedora Core 12 the plot comes up fine but missing the plot curve. When I run the same program in Windows 7 all is well with a plot containing the curve. Qt version is 4.6.2 on both platforms with qwt5.1.2 which I subversioned over and built on both machines. My constructor which does all of the work is below... Thanks very much for any insight into what I might be lacking here.

Code:

---

#include "myplot.h"
#include <qwt_symbol.h>
 
MyPlot::MyPlot(QWidget *gv) : QwtPlot ( gv)
{
 
    int i ;
 
    setTitle ("junk") ;
    QwtPlotCurve *curve1 = new QwtPlotCurve("Curve 1");
    curve1->attach(this);
    // alloc memory for data arrays
    xdata = new double [100] ;
    ydata = new double [100] ;
 
    // load arrays for display
    for (i = 0; i < 100; i++)
    {
                    xdata[i] = i ;
                    ydata[i] = i ;
    }
 
    curve1->setData(xdata, ydata, 100);
    curve1->setPen(QPen(Qt::red, 3));
    curve1->setStyle (QwtPlotCurve::Lines) ;
 
 
   replot() ;
 
}

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Anybody have any thoughts on this? I would still like to use Qwt as I do in my Windows projects but I am still unable to get a curve in my linux based qwt programs
thanks

The code snippet is ok - obviously this is not the code you have compiled or your problem is somewhere else.

Uwe

I am leaning that the problem is somewhere else, if you have the time, I have tarred up the cpp, header, .pro and makefile into the attachment to this message. Thanks

Attach a compilable tarball if you want someone to look at it.

Uwe