OpenCV C ++ / C compilation error: undefined reference to `cv :: fastFree (void *) '

I am trying to get a C program to call a function in a C ++ file using OpenCV. I can get the C file to call a basic integer function in the C ++ file and return the result, but whenever I try to add some OpenCV code to the C ++ file, I get compilation errors. Here is my simple code in each respective module:

foo.cpp

#include <time.h>
#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"

#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/core/mat.hpp"
#include "opencv/cv.hpp"

#include <iostream>

#ifdef _cplusplus 
extern "C" int f(int);
#endif 

using namespace std;
using namespace cv;

int f(int i)
{
cout << "CPP SON: " << i << endl;
i--;

//Mat image;

//image = imread( "image1.jpg", 1 );

//namedWindow( "image1.jpg", CV_WINDOW_AUTOSIZE );

//imshow( "image1.jpg", image );

//waitKey(0);

return i;
}

      

        
        
        
      

    

bar.c

#include <stdio.h>

int global = 0;

int f(int);

void cc(int i)
{
    global = f(i);
    /* ... */
    printf("hello from C! %d \n", global);
}

int main(int argc, char *argv[]) {

    printf("this si is the C code called main\n");
    cc(32);


}

      

        
        
        
      

    

Makefile

mot : foo.o bar.o
    g++ `pkg-config --cflags opencv` -o mot `pkg-config --libs opencv` foo.o bar.o

foo.o : foo.cpp
    g++ `pkg-config --cflags opencv` -c foo.cpp `pkg-config --libs opencv` -o foo.o

bar.o : bar.c
    g++ `pkg-config --cflags opencv` -c bar.c `pkg-config --libs opencv` -o bar.o

clean : 
    rm foo.o
    rm bar.o
    rm mot

      

        
        
        
      

    

Commenting out all the OpenCV lines in foo.cpp returns the following result:

bi@rtes4:~/Desktop$ make
g++ `pkg-config --cflags opencv` -c foo.cpp `pkg-config --libs opencv` -o foo.o
g++ `pkg-config --cflags opencv` -c bar.c `pkg-config --libs opencv` -o bar.o
g++ `pkg-config --cflags opencv` -o mot `pkg-config --libs opencv` foo.o bar.o
bi@rtes4:~/Desktop$ ./mot
this si is the C code called main
CPP SON: 32
hello from C! 31 

      

        
        
        
      

    

After commenting out the line "Mat image;" throws the following error:

bi@rtes4:~/Desktop$ make
g++ `pkg-config --cflags opencv` -c foo.cpp `pkg-config --libs opencv` -o foo.o
g++ `pkg-config --cflags opencv` -c bar.c `pkg-config --libs opencv` -o bar.o
g++ `pkg-config --cflags opencv` -o mot `pkg-config --libs opencv` foo.o bar.o
foo.o: In function `cv::Mat::~Mat()':
foo.cpp:(.text._ZN2cv3MatD2Ev[_ZN2cv3MatD5Ev]+0x39): undefined reference to `cv::fastFree(void*)'
foo.o: In function `cv::Mat::release()':
foo.cpp:(.text._ZN2cv3Mat7releaseEv[_ZN2cv3Mat7releaseEv]+0x47): undefined reference to `cv::Mat::deallocate()'
collect2: error: ld returned 1 exit status
make: *** [mot] Error 1

      

        
        
        
      

    

Does anyone have any help they can provide? Thank you in advance for your help in this matter, we are very grateful.