OpenCV GTK+2.x error

Question

I had installed OpenCV following these steps (). After trying to compile one examples,i got this error :

OpenCV Error: Unspecified error (The function is no         


        

Answer 1

@oxydron/Elliott Miller: I have Ubuntu 16.04 LTS environment with gtk 3 pre installed. I got the same error for Caffe build (master branch), Try the following steps, may be it should work for you.

sudo apt-get install libgtk-3-dev
cmake .. (WITH_GTK=ON and other settings), 
make

And bingo the error was gone... in my python caffe code

Please note:

The CMAKE configuration should reflect GTK+ 3.x instead of GTK+ 2.x

       GUI: 
--     QT:                          NO
--     GTK+ 3.x:                    YES (ver 3.18.9)
--     GThread :                    YES (ver 2.48.2)
--     GtkGlExt:                    NO
--     OpenGL support:              NO
--     VTK support:                 NO