#include <QMainWindow>
#include "ui_mainwindow.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
    
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    
private:
    Ui::MainWindow *ui;
};



MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

Line 22: error: QMainWindow: No such file or directory
Line 26: error: ui_mainwindow.h: No such file or directory
Line 9: error: expected class-name before '{' token
compilation terminated due to -Wfatal-errors.