继承QDeclarativeListView的小程序为什么编译不通过呢？该如何处理_QT开发

继承QDeclarativeListView的小程序为什么编译不通过呢？
.pro文件：

C/C++ code

QT       += core gui declarativeTARGET = extendedlistviewTEMPLATE = appSOURCES += main.cpp\        extendedlistview.cppHEADERS  += extendedlistview.h

extendedlistview.h文件：

C/C++ code

#include <QtDeclarative>#include "private/qdeclarativelistview_p.h"class ExtendedListView : public QDeclarativeListView{    Q_OBJECTpublic:    ExtendedListView(QDeclarativeListView *parent = 0);    ~ExtendedListView();};

extendedlistview.cpp文件：

C/C++ code

#include "extendedlistview.h"ExtendedListView::ExtendedListView(QDeclarativeListView *parent)    : QDeclarativeListView(parent){}ExtendedListView::~ExtendedListView(){}

main.cpp文件：

C/C++ code

#include <QtGui/QApplication>#include "extendedlistview.h"int main(int argc, char *argv[]){    QApplication a(argc, argv);    ExtendedListView w;    w.show();    return a.exec();}

提示错误：
undefined reference to 'QDeclarativeListView::QDeclarativeListView(QDeclarativeItem*)'
undefined reference to 'QDeclarativeListView::~QDeclarativeListView()'
...

是不是找不到QDeclarativeListView所在的库文件？怎么解决呢？

------解决方案--------------------
QDeclarativeListView is NOT a public interface of Qt!