self: super:
let
  unfree = import self.sources."${self.nixpkgs-channel}" { config.allowUnfree = true; };
  # unstableUnfree = import self.sources.nixos-unstable { config.allowUnfree = true; };
in
{
  inherit (unfree) discord factorio zoom-us skypeforlinux google-chrome minecraft teamviewer steam;
}