iMac mid 2011 results and 2.97rc2 OpenCL testing

This are my computer specs:

iMac 21.5" mid 2011.
CPU: i5 2,5Ghz
GPU: AMD Radeon HD 6750M 512mb
OS: Mac OS X 10.11.6

Blender 2.78c CPU rendering
(01) 64x64 = 7m 33s
(02) 128x128 = 7m 46s
(03) 512x512 = ~22m
(04) 1024x1024 = ~25m

So initially, using Blender 2.78 there’s no option to use my GPU, the option is grayed out.
I’ve been reading about Blender 2.79’s greatly improving AMD GPU’s so I downloaded it and tried to get my GPU to render the scene. Unfortunately the render engine could not even start. I get a black screen and checking the console it says the kernels can’t initiate.

I’m probably missing something here -or my computer graphic card is not good enough- so any help or if someone else with a similar computer can try it out too it’d be very welcome!