Error

[shashankvkt]

Hello I'm new to april tags and need a bit of help. Using your repository I've been able to compile as mentioned, but when i try to write a small snippet for another application (where i need to extract the center of the tag, I am facing a small issue and need `advise.The following is the code i've included all header files accordingly.

`using namespace std;
using namespace AprilTags;
using namespace cv;

int main(int argc, char* argv[])
{
VideoCapture cap(1); // open the default camera
if(!cap.isOpened()) // check if we succeeded
return -1;

namedWindow("view",1);
TagDetector detector(AprilTags::tagCodes36h11);

for(;;)
{
    Mat frame;
    cap >> frame; // get a new frame from camera
    std::vector< TagDetection> detector.extractTags(frame);
     imshow("view", frame);
    if(waitKey(30) >= 0) break;
}
// the camera will be deinitialized automatically in VideoCapture destructor
return 0;

}`

and am getting the following error which i am not able to solve.

In function main': /home/shashank/catkin_ws/src/apriltags-cpp/src/my_tag.cpp:39: undefined reference to AprilTags::TagDetector::extractTags(cv::Mat const&)'
CMakeFiles/my_tag.dir/my_tag.cpp.o: In function AprilTags::TagDetector::TagDetector(AprilTags::TagCodes const&)': /usr/local/include/AprilTags/TagDetector.h:21: undefined reference to AprilTags::TagFamily::TagFamily(AprilTags::TagCodes const&)'
collect2: error: ld returned 1 exit status
make[2]: *** [my_tag] Error 1
make[1]: *** [src/CMakeFiles/my_tag.dir/all] Error 2
make: *** [all] Error 2

could you plz help me on this.
Thnk you