#include <QApplication> #include <QLabel> int main(int argc, char *argv[])
wget https://download.qt.io/archive/qt/4.8/4.8.7/qt-everywhere-opensource-src-4.8.7.tar.gz Alternate: https://download.qt.io/archive/qt/4.8/4.8.7/ Linux (Ubuntu 18.04/20.04 example) sudo apt-get install build-essential libgl1-mesa-dev libglu1-mesa-dev \ libx11-dev libxext-dev libxtst-dev libxrender-dev libxrandr-dev \ libxcursor-dev libxfixes-dev libxi-dev libxinerama-dev libfreetype6-dev \ libfontconfig1-dev libdbus-1-dev libssl-dev tar xzf qt-everywhere-opensource-src-4.8.7.tar.gz cd qt-everywhere-opensource-src-4.8.7 ./configure -prefix /opt/qt487 -opensource -confirm-license -nomake examples -nomake demos make -j$(nproc) sudo make install
QApplication app(argc, argv); QLabel label("Hello from Qt 4.8.7"); label.show(); return app.exec();
qmake -project qmake make ./your_app