Qt and MathGL

[8Observer8]

Hello

I want to use MathGL in Qt

This is my steps:

1. I download "Win32 GPL binaries for MinGW (build for i686)"
2. I have 'includes' here: C:\MathGL\include
3. I have 'libs' here: C:\MathGL\libs
4. I read it: http://mathgl.sourceforge.net/doc_en/Using-QMathGL.html
5. I installed 'GSL' by Cygwin from here: http://www.gnu.org/software/gsl/
6. I wrote in *.pro:

INCLUDEPATH += "C:/cygwin/usr/include"
LIBS += "C:/cygwin/lib/libgsl.dll.a"

INCLUDEPATH += "C:/MathGL/include"
LIBS += "C:/MathGL/libs/libmgl-qt4.dll.a"

I wrote the code:

#include <mgl2/qmathgl.h>
 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
 
    // Create and setup QMathGL
    QMathGL *QMGL = new QMathGL( this );
}

#include <mgl2/qmathgl.h>

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);

    // Create and setup QMathGL
    QMathGL *QMGL = new QMathGL( this );
}

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But I receive this error:

Starting D:\GoogleDrive\Qt\MathGL\build-QMathGLSample-Desktop_Qt_5_4_0_MinGW_32bit-Debug\debug\QMathGLSample.exe...
The program has unexpectedly finished.

I hope you will help me. Thank you in advance