Software :: Specifying GCC Version For Building Kernel Module

I'm trying to set up a netbook I purchased that has a lot of more recent hardware, and so I'm having to compile some kernel modules on my own. I've installed Debian on this particular system, and so the version of gcc that was used to compile the kernel is older than the one currently in the repos. Now, I've installed the version I need, but can't remember how to specify building the modules in question with said version.

I've done this in the past, and recall temporarily changing some variable to use the different version, but it's been a while and I just can't remember. Is there an easier way to do this on the fly for any compilation? Or is changing a variable necessary? If there is no way to explicitly specify gcc version used prior to a compilation, could someone remind me of the variable I need to change to use x.x.x version?