2017-01-05 06:00:52 -0500 received badge ● Taxonomist 2014-10-13 07:31:13 -0500 answered a question How to compile the example "facerec_video.cpp"? I solve the problem by making a clean up. The problem was that i installed opencv from repo and than from source (cmake/make/make install). So i solve by removing the 'form source version' of opencv. To compile (facerec_video.cpp v2.4.9 here) i use opencv from repo and run: g++ pkg-config --cflags opencv -o facerec_video facerec_video.cpp pkg-config --libs opencv  Thanks for help! 2014-10-05 21:30:37 -0500 asked a question How to compile the example "facerec_video.cpp"? Hello. I got some problems to compile the example "Face Recognition in Videos with OpenCV" (problem with facerec_video.cpp). The problem is that i don't understand where is the "include files" #include "opencv2/core.hpp" #include "opencv2/face.hpp" #include "opencv2/highgui.hpp" #include "opencv2/imgproc.hpp" #include "opencv2/objdetect.hpp"  I installed opencv-2.4.9. Is this the problem? In /usr/local/include i found the opencv2 folder with all the header files. Really there was some differences: core.hpp was in opencv2/core/core.hpp, highgui.hpp in opencv2/highgui/highgui.hpp and so on but can't find face.hpp. Help me please!