c++ - Opencv with fedora 23 Qt: The program has unexpectedly finished -

the program has unexpectedly finished. starting /home/tamercan/build-myfirst2-desktop_qt_5_7_0_gcc_64bit-debug/myfirst2... /home/tamercan/build-myfirst2-desktop_qt_5_7_0_gcc_64bit-debug/myfirst2 crashed.

this main.cpp

#include <opencv2/core/base.hpp> #include <opencv2/core/mat.hpp> #include <opencv2/core/types.hpp> #include <opencv2/highgui/highgui_c.h> #include <opencv2/highgui.hpp> #include <opencv2/imgproc.hpp> #include <opencv2/objdetect/objdetect_c.h> #include <opencv2/objdetect.hpp> #include <opencv2/videoio.hpp> #include <iostream> #include <vector>  using namespace cv; using namespace std;  int main(int argc, char* argv[]) {     videocapture cap(0); // open video camera no. 0        namedwindow("myvideo",cv_window_autosize); //create window called "myvideo"     // load face cascade (.xml file)         cascadeclassifier face_cascade;         face_cascade.load( "xml/haarcascade_frontalface_alt.xml" );      while (1)     {         mat frame;          bool bsuccess = cap.read(frame); // read new frame video           if (!bsuccess) //if not success, break loop         {              cout << "cannot read frame video stream" << endl;              break;         }          // detect faces              std::vector<rect> faces;              face_cascade.detectmultiscale( frame, faces, 1.1, 2, 0|cv_haar_scale_image, size(30, 30) );               // draw circles on detected faces              for( int = 0; < faces.size(); i++ )              {                  point center( faces[i].x + faces[i].width*0.5, faces[i].y + faces[i].height*0.5 );                  ellipse( frame, center, size( faces[i].width*0.5, faces[i].height*0.5), 0, 0, 360, scalar( 255, 0, 255 ), 4, 8, 0 );                        imshow( "detected face", frame );              }                     //rectangle( frame, center, size( faces[i].width*2, faces[i].height*2), scalar( 255, 0, 255 ) );             if (waitkey(30) == 27) //wait 'esc' key press 30ms. if 'esc' key pressed, break loop        {             cout << "esc key pressed user" << endl;             break;        }     }     return 0;  } 

my .pro file is

qt += core qt -= gui  config += c++11  target = myfirst2 config += console config -= app_bundle  qmake_default_incdirs="" && make  template = app  sources += main.cpp  includepath += /usr/include/ libs += -l/usr/lib -lopencv_core -lopencv_highgui -lopencv_video -lopencv_videoio -lopencv_imgproc -lopencv_ml -lopencv_features2d -lopencv_calib3d -lopencv_objdetect