qt support for VNC

i want to test whether qt is supporting VNC or not. For that i have written a small layout program using Qt library.

the source code for the layout program is as follows:

layout.cpp
------------------
#include <QApplication>
#include <QHBoxLayout>
#include <QSlider>
#include <QSpinBox>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget *window = new QWidget;
window->setWindowTitle("Enter The Age of the person");
QSpinBox *spinBox = new QSpinBox;
QSlider *slider = new QSlider(Qt::Horizontal);
spinBox->setRange(0, 130);
slider->setRange(0, 130);
QObject::connect(spinBox, SIGNAL(valueChanged(int)),
slider, SLOT(setValue(int)));
QObject::connect(slider, SIGNAL(valueChanged(int)),
spinBox, SLOT(setValue(int)));
spinBox->setValue(35);
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(spinBox);
layout->addWidget(slider);
window->setLayout(layout);
window->show();
return app.exec();
}

i want to run this as server application on my linux PC.For that what i configured Qt and installed like this.
1)./configure -qt-gfx-vnc
2) make
3) make install


The program is working fine. But if i run the application as VNC server application like

./layout -qws -display VNC:0

i am encountering an error.it says that
"_X11TransSocketINETConnect() can't get address for VNC:6000: Temporary failure in name resolution"..

pls help me what i need to do.

Thanks