#version check qtTOO_OLD_LIST=$$find(QT_VERSION, ^4\.[0-4])count(TOO_OLD_LIST, 1) { message("Cannot build the program with a Qt version that old:" $$QT_VERSION) error("Use at least Qt 4.5.")}
QT_REQUIRE_VERSION(argc, argv, "4.5.0");
QFileDialog* dialog = new QFileDialog;dialog->open();