For Steam, NixOS actually builds a full FHS with all the packages from SteamOS and then runs Steam within that using a simple chroot. It works surprisingly well

For Steam, NixOS actually builds a full FHS with all the packages from SteamOS and then runs Steam within that using a simple chroot. It works surprisingly well and can also be used for stubborn software that cannot work without FHS and without messing up the rest of your system.