git clone https://code.qt.io/qt/qt5.git cd qt5 git checkout 5.15 perl init-repository
pacman -S mingw-w64-x86_64-qt5
Ubuntu 20.04 LTS has Qt 5.15.2 in its official repos: qt5.15 download
// main.cpp #include <QApplication> #include <QLabel> int main(int argc, char *argv[]) QApplication app(argc, argv); QLabel label("Hello Qt 5.15!"); label.show(); return app.exec(); git clone https://code