Qt 프로그램입니다....컴파일시 에러가 나는데 뭐가 문제인지...

Qt를 이용해서 만든
시리얼 통신 수신부 소스 입니다...

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <qapplication.h>
#include <qpainter.h>
#include <qtimer.h>

#define BAUDRATE B115200
#define MODEMDEVICE "/dev/ttySA0"
#define _POSIX_SOURCE 1

class mywid:public QWidget
{
Q_OBJECT
public:
mywid();
private slots:
void slotTimer();
private:
void paintEvent(QPaintEvent*);
QTimer* timer;
};

mywid::mywid()
{
resize(300, 200);
setCaption("hi");

timer = new QTimer(this);

connect(timer, SIGNAL(timeout()),this, SLOT(slotTimer()));

timer->start(500, false);
}
void mywid::slotTimer()
{
void paintEvent(QPaintEvent*);
}

void mywid::paintEvent(QPaintEvent*)
{
QPainter p(this);

int fd, res, num[2], i=0, c=1, sta=10, cat=0, tmp=0;
struct termios oldtio, newtio;
char buf[4];

fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY);

tcgetattr(fd, &oldtio);
bzero(&newtio, sizeof(newtio));

newtio.c_cflag = BAUDRATE | CS8 | CLOCAL | CREAD | CRTSCTS;
newtio.c_iflag = IGNPAR;
newtio.c_oflag = 0;
newtio.c_lflag = 0;

newtio.c_cc[VTIME] = 0;
newtio.c_cc[VMIN] = 1;

for(i=0;i<2;i++){
res = read(fd, buf, 4);
num[i] = atoi(buf);
}
p.drawLine(sta, num[0], sta+10, num[1]);
printf("%d %d %d %d\n", sta, num[0], sta+10, num[1]);
sta=sta+10;

tcsetattr(fd, TCSANOW, &oldtio);
tmp = num[1];

while(c){
res = read(fd, buf, 4);
cat = atoi(buf);
p.drawLine(sta, tmp, sta+10, cat);
printf("%d %d %d %d\n", sta, tmp, sta+10, cat);
sta = sta+10;

tcsetattr(fd, TCSANOW, &oldtio);
tmp = cat;
}

}

int main(int argc, char **argv)
{
QApplication app(argc, argv);
mywid mw;

app.setMainWidget(&mw);
mw.show();

return app.exec();
}

컴파일할때요

In function `mywid::mywid(void)' :
undefined reference to `mywid::QPaintDeveice virtual table'
undefined reference to `mywid virtual table'
In function `main':
undefined reference to `mywid::QPaintDeveice virtual table'
undefined reference to `mywid virtual table'

이런 에러가 뜨네요......ㅡ,.ㅡ;;;
머가 정의가 안됐다는건지.....
부탁드립니다.....^^;;;