unresolved external symbol with qwt3d

[pospiech]

I am trying to use the libary qwt3d.

I created a simple class to use it:

#ifndef QPLOT3D_H_
#define QPLOT3D_H_
 
#include <qwt3d_surfaceplot.h>
#include <qwt3d_function.h>
 
using namespace Qwt3D;
 
class QPlot3D : public SurfacePlot 
{
	Q_OBJECT
public:
	QPlot3D(QWidget* parent = 0, Qt::WFlags flags = 0);
	virtual ~QPlot3D();
 
};
#endif

#ifndef QPLOT3D_H_
#define QPLOT3D_H_

#include <qwt3d_surfaceplot.h>
#include <qwt3d_function.h>
 
using namespace Qwt3D;

class QPlot3D : public SurfacePlot 
{
	Q_OBJECT
public:
	QPlot3D(QWidget* parent = 0, Qt::WFlags flags = 0);
	virtual ~QPlot3D();

};
#endif

To copy to clipboard, switch view to plain text mode 

#include "QPlot3D.h"
 
QPlot3D::QPlot3D( QWidget* parent /*= 0*/, Qt::WFlags flags /*= 0*/ ) 
: SurfacePlot(parent)
{
}
 
QPlot3D::~QPlot3D()
{
}

#include "QPlot3D.h"

QPlot3D::QPlot3D( QWidget* parent /*= 0*/, Qt::WFlags flags /*= 0*/ ) 
: SurfacePlot(parent)
{
}

QPlot3D::~QPlot3D()
{
}

To copy to clipboard, switch view to plain text mode 

which results only in the linker error:

1>moc_QPlot3D.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const Qwt3D::SurfacePlot::staticMetaObject" (?staticMetaObject@SurfacePlot@Qwt3D@@2UQMetaObjec t@@B)

the libary (.lib) files are loaded, the moc file is part of the project and compiled.
Therefore I do not see what is missing.