Add a role for lutris.

nix/configuration/roles/lutris/default.nix

@@ -0,0 +1,35 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me = {
+    lutris.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install lutris.";
+    };
+  };
+
+  config = lib.mkIf (config.me.lutris.enable && config.me.graphical) {
+    environment.systemPackages = with pkgs; [
+      lutris
+    ];
+
+    # If we need additional libraries for any games:
+    # (lutris.override {
+    #   extraLibraries =  pkgs: [
+    #     # List library dependencies here
+    #   ];
+    #   extraPkgs = pkgs: [
+    #     # List package dependencies here
+    #   ];
+    # })
+  };
+}