尝试编译时QT未定义参考错误

_imp___ZN10QTcpServer6listenERK12QHostAddresst\'
  release/icecastserver.o:icecastserver.cpp:(.text+0x73): undefined reference to

_imp___ZNK10QTcpServer11errorStringEv\'
  release/icecastserver.o:icecastserver.cpp:(.text+0x3d4): undefined reference to

_imp___ZN10QTcpServerC1EP7QObject\'
  release/icecastserver.o:icecastserver.cpp:(.text+0x4d4): undefined reference to

_imp___ZN10QTcpServer6listenERK12QHostAddresst\'
  release/icecastserver.o:icecastserver.cpp:(.text+0x4f7): undefined reference to

_imp___ZNK10QTcpServer11errorStringEv\'
  release/icecastserver.o:icecastserver.cpp:(.text+0x858): undefined reference to

#ifndef ICECASTSERVER_H
#define ICECASTSERVER_H

#include <QObject>

QT_BEGIN_NAMESPACE
class QTcpServer;
QT_END_NAMESPACE

class IcecastServer : public QObject
{
    Q_OBJECT
public:
    explicit IcecastServer(QObject *parent = 0);

signals:

public slots:

private:
    QTcpServer *tcpServer;
};

#endif // ICECASTSERVER_H

#include \"icecastserver.h\"
#include \"QDebug\"
#include <QtNetwork/QTcpServer>
#include <QtGui>

IcecastServer::IcecastServer(QObject *parent) :
    QObject(parent)
{

    tcpServer = new QTcpServer(this);
    //tcpServer->listen(QHostAddress::Any,8000);

    if (!tcpServer->listen()){
        QMessageBox::critical(NULL, tr(\"Fortune Server\"), tr(\"Unable to start the server: %1.\").arg(tcpServer->errorString()));

         return;
    }

}