self: super:
let
  baseConfig = {
    allowUnfree = true;
  };
  nixpkgs-steam-56 = import (super.fetchFromGitHub {
    owner = "nyanloutre";
    repo = "nixpkgs";
    rev = "7af3a85d8d1a91b57b6cdee0b2e5d88981f310fa";
    sha256 = "1rcd0nw8k1pcp80zm8kyhk288dj5ifmxhpacm1wi5hfnhw194w1g";
  }) {config = baseConfig;};
in
{
  steam_primus = nixpkgs-steam-56.steamPackages.steam-chrootenv.override {
    withPrimus = true;
  };
}