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OGLQuad error LNK2001: unresolved external symbol "public: virtual bool __thiscall OGLQuad::qt_property(int,int,class QVariant *)" (?qt_property@OGLQuad@@UAE_NHHPAVQVariant@@@Z)

#ifndef _OGLQuad_h_
#define _OGLQuad_h_

#include <qgl.h>

// ======================================================================
class OGLQuad : public QGLWidget {
    Q_OBJECT

protected:
    virtual void initializeGL(                       );
    virtual void resizeGL    (int nWidth, int nHeight);
    virtual void paintGL     (                       );

public:
    OGLQuad(QWidget* pwgt = 0, const char* pszName = 0);
};

#endif  //_OGLQuad_h_

LINK : warning LNK4199: /DELAYLOAD:comdlg32.dll ignored; no imports found from comdlg32.dll
LINK : warning LNK4199: /DELAYLOAD:oleaut32.dll ignored; no imports found from oleaut32.dll
LINK : warning LNK4199: /DELAYLOAD:winmm.dll ignored; no imports found from winmm.dll
LINK : warning LNK4199: /DELAYLOAD:wsock32.dll ignored; no imports found from wsock32.dll
LINK : warning LNK4199: /DELAYLOAD:winspool.dll ignored; no imports found from winspool.dll
LINK : warning LNK4089: all references to 'MSVCP71.dll' discarded by /OPT:REF

OGLQuad error LNK2019: unresolved external symbol __imp__glOrtho@48 referenced in function "protected: virtual void __thiscall OGLQuad::resizeGL(int,int)" (?resizeGL@OGLQuad@@MAEXHH@Z)

OGLQuad error LNK2019: unresolved external symbol __imp__glClear@4 referenced in function "protected: virtual void __thiscall OGLQuad::paintGL(void)" (?paintGL@OGLQuad@@MAEXXZ)

moc oglquad.h -o moc_oglquad.cpp

TEMPLATE  = app
CONFIG   += qt opengl warn_on release
HEADERS   = OGLQuad.h
SOURCES	  = OGLQuad.cpp \
            main.cpp
TARGET    = OGLQuad

class OGLQuad : public QGLWidget {
    Q_OBJECT

protected:
    virtual void initializeGL(                       );
    virtual void resizeGL    ( int nWidth, int nHeight );
    //virtual void paintGL     (                       );

public:
    OGLQuad(QWidget* pwgt = 0, const char* pszName = 0);
};

void OGLQuad::resizeGL    ( int nWidth, int nHeight )
{
    glMatrixMode(GL_PROJECTION);// вот оно
    ...
    ...
}