Select tool chain for native builds

I have Visual Studio and MinGW installed. I need Gralde to use the MinGW compiler and to ignore the MS compiler is there a way to do this? I do not have admin and I cannot change environmental variables like path. To make it even more irritating any changes I make are not persistent as this computer is a VM that is rebuilt from the gold image every power cycle. So changing user vars will not work.

Thanks,