text: #ifndef DIP_OPENCV
  #define DIP_OPENCV
  
  #include <opencv2/core/core_c.h>
  #include <opencv2/imgproc/imgproc_c.h>
  
  #ifdef DIP_DESKTOP
  #include <opencv2/highgui/highgui_c.h>
  #endif
  
  #ifdef __cplusplus
  #include <opencv2/core/core.hpp>
  #include <opencv2/imgproc/imgproc.hpp>
  
  #ifdef DIP_DESKTOP
  #include <opencv2/highgui/highgui.hpp>
  #endif
  
  #if CV_MAJOR_VERSION >= 3
  #include <opencv2/imgcodecs.hpp>
  #endif
  
  #endif
  
  #endif /* DIP_OPENCV */
  