55d9a2c596
This attribute set isn't passed through the NixOS config resolution mechanism, which means that we can't use lib.mkDefault here. Instead, just put it before any user overrides so that if the user specifies this environment variable it'll just override it anyway.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.