.hpp files include wrong directories

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Hello there, I recently installed Opencv on my machine running ubuntu. Everything installed without problems using :
sudo cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local .. sudo make sudo make install Now I created a new project with QT, included "opencv4/opencv2/calib3d.hpp" , and now inside that file it says that it cant find another include "opencv2/core.hpp" . I looked inside those directories and it is like it added "opencv2/" in fron of al directories. Of corse the directory opencv2 in all those cases doesnt exist. This is just one example, but it happens with many of the files.

main.cpp:

#include "widget.h" 
#include "opencv4/opencv2/calib3d.hpp"      //includes without any problem
#include  QApplication> // as a normal include

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

Error message:

/usr/local/include/opencv4/opencv2/calib3d.hpp:47: Fehler: opencv2/core.hpp: No such file or directory
 #include "opencv2/core.hpp"
          ^~~~~~~~~~~~~~~~~~

opencv4/opencv2/calib3d.hpp:

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#ifndef OPENCV_CALIB3D_HPP
#define OPENCV_CALIB3D_HPP

#include "opencv2/core.hpp"                        //Here are the problems !!!!
#include "opencv2/features2d.hpp"
#include "opencv2/core/affine.hpp"

/**
  @defgroup calib3d Camera Calibration and 3D Reconstruction

                                      //File continues ...

I installed opencv in another directory called /home/tim/OPCV . Inside the include/opencv4 ... (more)