cannot connect to X server

[jpn]

QApplication is part of QtGui, QCoreApplication is part of QtCore.

#include <QCoreApplication>
int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    qWarning("hello");    
    return app.exec();
}

#include <QCoreApplication>
int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    qWarning("hello");    
    return app.exec();
}

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