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

For me (Arch Linux, Anaconda with Python 3.6), installing from the suggested channels menpo or loopbio did not change anything. My solution was to

1. install pkg-config (sudo pacman -Syu pkg-config),
2. remove opencv from the environment (conda remove opencv) and
3. re-install opencv from the conda-forge channel (conda install -c conda-forge opencv)

conda list now returns opencv 3.3.0 py36_blas_openblas_203 [blas_openblas] conda-forgeand all windows launched using cv2 are working fine.