What is wrong with this simple example ?

[igor]

It should work (I think)

#include <QApplication>
#include <QFont>
#include <QPushButton>
#include <QWidget>
#include <QCalendarWidget>
#include <QVBoxLayout>
#include <iostream>
 
class MyWidget : public QWidget
{
	Q_OBJECT
 
public:
	MyWidget(QWidget *parent = 0) ;
 
public slots:
	void calClicked ( const QDate & ) ;
} ;
 
void MyWidget::calClicked ( const QDate & theDate )
{	std::cout << theDate.toString( "ddd MMMM d yyyy" ).toStdString() << std::endl ;
}
 
MyWidget::MyWidget ( QWidget *parent ) : QWidget ( parent )
{
	QPushButton *quit = new QPushButton ( tr ( "Quit" ), this ) ;
	quit->setGeometry ( 62, 40, 75, 30 ) ;
	quit->setFont ( QFont( "Times", 18, QFont::Bold ) ) ;
	connect ( quit, SIGNAL( clicked() ), qApp, SLOT(quit()) ) ;
 
	QCalendarWidget *dateEdit = new QCalendarWidget () ;
	connect ( dateEdit, SIGNAL( clicked(const QDate&) ), this, SLOT(calClicked(const QDate&)) ) ;
 
	QVBoxLayout *layout = new QVBoxLayout;
	layout->addWidget(dateEdit);
	layout->addWidget(quit);
	setLayout(layout);
 
}
 
int main(int argc, char* argv[] )
{
	QApplication app(argc, argv ) ;
	MyWidget widget ;
	widget.show() ;
	return app.exec() ;
}

#include <QApplication>
#include <QFont>
#include <QPushButton>
#include <QWidget>
#include <QCalendarWidget>
#include <QVBoxLayout>
#include <iostream>

class MyWidget : public QWidget
{
	Q_OBJECT
	
public:
	MyWidget(QWidget *parent = 0) ;

public slots:
	void calClicked ( const QDate & ) ;
} ;

void MyWidget::calClicked ( const QDate & theDate )
{	std::cout << theDate.toString( "ddd MMMM d yyyy" ).toStdString() << std::endl ;
}

MyWidget::MyWidget ( QWidget *parent ) : QWidget ( parent )
{
	QPushButton *quit = new QPushButton ( tr ( "Quit" ), this ) ;
	quit->setGeometry ( 62, 40, 75, 30 ) ;
	quit->setFont ( QFont( "Times", 18, QFont::Bold ) ) ;
	connect ( quit, SIGNAL( clicked() ), qApp, SLOT(quit()) ) ;

	QCalendarWidget *dateEdit = new QCalendarWidget () ;
	connect ( dateEdit, SIGNAL( clicked(const QDate&) ), this, SLOT(calClicked(const QDate&)) ) ;
		
	QVBoxLayout *layout = new QVBoxLayout;
	layout->addWidget(dateEdit);
	layout->addWidget(quit);
	setLayout(layout);

}

int main(int argc, char* argv[] )
{
	QApplication app(argc, argv ) ;
	MyWidget widget ;
	widget.show() ;
	return app.exec() ;
}

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Here's the compile:

c++ -headerpad_max_install_names -o DIY-Cal.app/Contents/MacOS/DIY-Cal main.o -L/usr/local/Trolltech/Qt-4.2.2/lib -lQtGui -L/Volumes/Whopper07/TiBookPurge/qt-mac-opensource-src-4.2.2/lib -framework Carbon -framework QuickTime -framework AppKit -lQtCore -lz -lm -liconv -framework ApplicationServices
/usr/bin/ld: Undefined symbols:
MyWidget::staticMetaObject
vtable for MyWidget
collect2: ld returned 1 exit status
make: *** [DIY-Cal.app/Contents/MacOS/DIY-Cal] Error 1

What is even weirder, it WILL compile if I remove "Q_OBJECT", but when I run it, it says:

Object::connect: No such slot QWidget::calClicked(QDate)

Help !