just for the sake of completeness:
C:\workspace\opencv3\build\install includes 4 directories:
bin, with .exe and .dll files
lib, with .lib and some .cmake files
etc, only .xml
include, with opencv2 folder inside, which has .hpp files and some other folders (among these also a directory ‘highgui’ with a different highgui.hpp and a highui_c.h).
Now I wonder if I’m looking at the wrong directory