Meet problem when I inherit a class from QDeclarativeListView

[nan3113]

.pro file：
@
QT += core gui declarative

TARGET = extendedlistview
TEMPLATE = app

SOURCES += main.cpp
extendedlistview.cpp

HEADERS += extendedlistview.h

@

extendedlistview.h file：

@
#include <QtDeclarative>
#include "private/qdeclarativelistview_p.h"

class ExtendedListView : public QDeclarativeListView
{
Q_OBJECT

public:
ExtendedListView(QDeclarativeListView *parent = 0);
~ExtendedListView();
};

@

extendedlistview.cpp file：
@
#include "extendedlistview.h"

ExtendedListView::ExtendedListView(QDeclarativeListView *parent)
: QDeclarativeListView(parent)
{
}

ExtendedListView::~ExtendedListView()
{

}

@

main.cpp file：
@
#include <QtGui/QApplication>
#include "extendedlistview.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
ExtendedListView w;
w.show();

return a.exec();

}

@

build errors：
undefined reference to 'QDeclarativeListView::QDeclarativeListView(QDeclarativeItem*)'
undefined reference to 'QDeclarativeListView::~QDeclarativeListView()'
...errors like these

Does it can't find library in which QDeclarativeListView class lies? how can I solve it?