https://bugs.freedesktop.org/show_bug.cgi?id=82717
--- Comment #5 from Christoph Haag haagch@frickel.club --- (In reply to comment #4)
Thanks, they fixed it upstream: https://code.google.com/p/mandelbulber/source/detail?r=451
That went quicker than I thought.
"Only" OpenCL 1.2 is missing then I guess.