Just so I understand: you can get it to compile if the driver installation doesn't work? That doesn't make sense to me -- you're missing an opencl dependency, and the opencl installation shouldn't care whether you have the default display driver or the latest AMD one (correct me if I'm wrong there).

Since your configure is complaining about missing opencl, I assume that's what is failing to install? If so, what errors are you getting? Or is it installing ok, and configure still complaining?