【openCV学习笔记】【3】高斯模糊一张图片（_cvSmooth相关编译错误）

#include <iostream>
#include <opencv/highgui.h>
#include <opencv/cv.h>


void example( IplImage* image )
{
    // Create some windows to show the input
    // and output images in.
    //
    cvNamedWindow( "Example2_4-in", CV_WINDOW_AUTOSIZE );
    cvNamedWindow( "Example2_4-out", CV_WINDOW_AUTOSIZE );
    
    // Create a window to show our input image
    //
    cvShowImage( "Example2_4-in", image );
    
    // Create an image to hold the smoothed output
    //
    IplImage* out = cvCreateImage(
                                  cvGetSize(image),
                                  IPL_DEPTH_8U,
                                  3
                                  );
    
    // Do the smoothing
    //
    cvSmooth( image, out, CV_GAUSSIAN, 5,5 );
    cvSmooth( out, out, CV_GAUSSIAN, 5, 5);
    
    // Show the smoothed image in the output window
    //
    cvShowImage( "Example2_4-out", out );
    
    // Be tidy
    //
    cvReleaseImage( &out );
    
    // Wait for the user to hit a key, then clean up the windows
    //
    cvWaitKey( 0 );
    cvDestroyWindow("Example2_4-in" );
    cvDestroyWindow("Example2_4-out" );
    
}

int main( int argc, char** argv )
{
    IplImage* img = cvLoadImage("/Users/apple/Pictures/openCV/standard_img/lena.jpg");
    cvNamedWindow("Example1", CV_WINDOW_AUTOSIZE );
    cvShowImage("Example1", img );
    example( img );
    //  cvWaitKey(0);
    cvReleaseImage( &img );
    cvDestroyWindow("Example1");
}

Undefined symbols for architecture x86_64:
  "_cvSmooth", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)