OpenCV problem

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Hi, I download and install OpenCV 3.1, but when I want to start a code it wrote me back this error message

CODE

#include "highgui.h"

int main(void)
{
 cvNamedWindow("Demo", CV_WINDOW_AUTOSIZE);
 cvCapture* capture = cvCreateCameraCapture(0);
 IplImage* frame;
 while(1)
 {
      frame = cvQueryFrame(capture);
      if(!frame)break;
      cvShowImage("Demo",frame);
      char c = cvWaitKey(33);
      if(c==27)break;
 }
 cvReleaseCapture(&capture);
 cvDestroyWindow("Demo");
 return 0;
 }

here is my error message

CMakeFiles/camera.dir/camera.c.o: In function `cvPointFrom32f':
camera.c:(.text+0x7a4): undefined reference to `cvRound'
camera.c:(.text+0x7bc): undefined reference to `cvRound'
CMakeFiles/camera.dir/camera.c.o: In function `cvReadInt':
camera.c:(.text+0x1378): undefined reference to `cvRound'
CMakeFiles/camera.dir/camera.c.o: In function `cvEllipseBox':
camera.c:(.text+0x169c): undefined reference to `cvRound'
camera.c:(.text+0x16bc): undefined reference to `cvRound'
collect2: ld returned 1 exit status
CMakeFiles/camera.dir/build.make:113: recipe for target 'camera' failed
make[2]: * [camera] Error 1
CMakeFiles/Makefile2:63: recipe for target 'CMakeFiles/camera.dir/all' failed
make[1]: * [CMakeFiles/camera.dir/all] Error 2
Makefile:75: recipe for target 'all' failed
make: * [all] Error 2

please what I have to do to solve this problem? :)