compilling in linux mandriva

[newplayer]

I have 'main.cpp':

#include <QApplication>
#include <QPushButton>
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QPushButton hello("Hello world!");
    hello.resize(100, 30);
    hello.show();
    return app.exec();
}

#include <QApplication>
#include <QPushButton>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QPushButton hello("Hello world!");
    hello.resize(100, 30);
    hello.show();
    return app.exec();
}

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How can I compile it ?

c++ -o prog main.cpp

c++ -o prog main.cpp

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doesn't work