[완료]QThread 사용하는데 collect2: ld returned 1 exit status 에러 발생

/* main.cpp */
#include <QtGui/QApplication>
#include "replaydb.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    replayDB replay;
 
    replay.show();
    return a.exec();
}
 
replaydb.h가 다이얼로그를 가지는데요. 여기서 replaythread.h를 include하여 스레드 변수를 선언합니다.( replayThread selectSendThread; )
<code>
/* replaydb.h */
#ifndef REPLAYDB_H
#define REPLAYDB_H
 
#include <QMainWindow>
#include <QDialog>
#include <replaythread.h>
 
namespace Ui {
    class replayDB;
}
 
class replayDB : public QMainWindow {
    Q_OBJECT
public:
    replayDB(QWidget *parent = 0);
    ~replayDB();
 
protected:
    void changeEvent(QEvent *e);
    void closeEvent(QCloseEvent *event);
 
private slots:
    void startThread();
    void stopThread();
 
private:
    Ui::replayDB *ui;
 
    replayThread selectSendThread;
 
    QPushButton *startReplayButton;
    QPushButton *stopReplayButton;
};
 
#endif // REPLAYDB_H

/* replaydb.cpp */
void replayDB::startThread()
{
    if (selectSendThread.isRunning())
    {
        selectSendThread.start();
    }
}

/* replaythread.h */
#ifndef REPLAYTHREAD_H
#define REPLAYTHREAD_H
 
#include <QThread>
#include "stdio.h"
 
class replayThread : public QThread {
    Q_OBJECT
 
public:
    replayThread();
 
    void stop();
 
protected:
    void run();
 
private:
    volatile bool stopped;
};
 
#endif // REPLAYTHREAD_H