Ошибки компиляции "unresolved external symbol" при сборке проекта с dlib

#include <dlib/image_processing.h>
#include <dlib/gui_widgets.h>
#include <dlib/image_io.h>
#include <dlib/dir_nav.h>
 
 
using namespace dlib;
using namespace std;
 
int main(int argc, char** argv) 
{
    if (argc != 2)
    {
        cout << "Call this program like this: " << endl;
        cout << "./video_tracking_ex ../video_frames" << endl;
        return 1;
    }
 
    // Get the list of video frames.  
    std::vector<file> files = get_files_in_directory_tree(argv[1], match_ending(".jpg"));
    std::sort(files.begin(), files.end());
    if (files.size() == 0)
    {
        cout << "No images found in " << argv[1] << endl;
        return 1;
    }
 
    // Load the first frame.  
    array2d<unsigned char> img;
    load_image(img, files[0]);
    // Now create a tracker and start a track on the juice box.  If you look at the first
    // frame you will see that the juice box is centered at pixel point(92,110) and 38
    // pixels wide and 86 pixels tall.
    correlation_tracker tracker;
    tracker.start_track(img, centered_rect(point(93, 110), 38, 86));
 
    // Now run the tracker.  All we have to do is call tracker.update() and it will keep
    // track of the juice box!
    image_window win;
    for (unsigned long i = 1; i < files.size(); ++i)
    {
        load_image(img, files[i]);
        tracker.update(img);
 
        win.set_image(img);
        win.clear_overlay();
        win.add_overlay(tracker.get_position());
 
        cout << "hit enter to process next frame" << endl;
        cin.get();
    }
}
catch (std::exception& e)
{
    cout << e.what() << endl;
}

 int main(int argc, char** argv)