After extensive headaches of trying to install cpyrit_opencl , looking at various guides, I found once that works just nicely without receiving errors about 'headers required to build the opencl-kernel'
Guide was originally compiled by nozyczek, credits due. I've just edited it slightly and added my my google doc list for safe future ref.

https://docs.google.com/document/d/1...lftLhVUpU/edit