Mac OS X, Append Application Menu.

gistfile1.cpp

    QAction* quitAction = new QAction(tr("終了(&Q)"), this);
    connect(quitAction, SIGNAL(triggered()),  this, SLOT(close()));
    quitAction->setMenuRole(QAction::ApplicationSpecificRole);

    QMenu* fileMenu = this->menuBar()->addMenu(tr("ファイル(&F)"));
    fileMenu->addSeparator();
    fileMenu->addAction(quitAction);