简单示例（Linux）

在 window.h

#include <QWidget>

class Window : public QWidget
{
    Q_OBJECT
public:
    Window(QWidget *parent = Q_NULLPTR) : QWidget(parent) {}
}

main.cpp 中

#include <QApplication>
#include "Window.h"

int main()
{
    QApplication app;
    Window window;
    window.show();
    return app.exec();
}

example.pro

# The QT variable controls what modules are included in compilation.
# Note that the 'core' and 'gui' modules are included by default.
# For widget-based GUI applications, the 'widgets' module needs to be added.
QT += widgets  

HEADERS = Window.h # Everything added to the HEADER variable will be checked 
                   # to see if moc needs to run on it, and it will be run if
                   # so.

SOURCES = main.cpp # Everything added to the SOURCES variable will be compiled
                   # and (in the simple example) added to the resulting
                   # executable.

命令行

# Assuming you are in a folder that contains the above files.
> qmake         # You can also add the example.pro file if needed
> make          # qmake creates a Makefile, this runs make on it.
> ./example     # The name of the executable defaults to the .pro file name.