Xformers installation on recent distros with gcc 12

[watzon]

I'm running Nobara which is based on Fedora 36. By default it comes with gcc 12 installed, and unfortunately uninstalling and installing gcc 11 in its place isn't an option. After banging my head against a wall for the past few hours I finally found a solution to installing gcc 11 and using it for the xformers build.

Literally all you have to do is follow the instructions in the gcc-builder guide, install gcc 11.3.0, source the provisioning file (if you're using zsh the file will require some modifications), and build xformers as normal using pip install -e .

Hope this helps someone!