CODEWITHSUNDEEP
copencv
marshallslee
marshallslee

Reputation: 655

OpenCV: "Undefined symbols for architecture x86_64:" while attempting to compile

Environment: OS: macOS, OpenCV: 2.4.12

I just started learning OpenCV, and I wrote down a code from a book, which is,

#include <opencv/highgui.h>

int main(int argc, char **argv) {
        int iscolor = -1;
        IplImage* img = cvLoadImage(argv[1], iscolor);
        cvNamedWindow("Example1", CV_WINDOW_AUTOSIZE);
        cvShowImage("Example1", img);
        cvWaitKey(0);

        cvReleaseImage(&img);
        cvDestroyWindow("Example1");
        return 0;
}

When I tried to compile this code with this command - gcc opencv1.c -o opencv1, it showed an error with the following message.

Undefined symbols for architecture x86_64:
  "_cvDestroyWindow", referenced from:
      _main in opencv1-78cabd.o
  "_cvLoadImage", referenced from:
      _main in opencv1-78cabd.o
  "_cvNamedWindow", referenced from:
      _main in opencv1-78cabd.o
  "_cvReleaseImage", referenced from:
      _main in opencv1-78cabd.o
  "_cvShowImage", referenced from:
      _main in opencv1-78cabd.o
  "_cvWaitKey", referenced from:
      _main in opencv1-78cabd.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Does anybody know the solution?

Upvotes: 2

Views: 365

Answers (1)

David Ranieri
David Ranieri

Reputation: 41017

You need to include the OpenCV libraries when compiling, pkg-config can help:

gcc `pkg-config --cflags opencv` `pkg-config --libs opencv` opencv1.c -o opencv1

Upvotes: 2

Related Questions