Update Darwin building and copier

modules/default.nix

@@ -2,12 +2,12 @@
 
 let
 	inherit (lib.strings) hasSuffix;
-	system = pkgs.system; in
-{
+	system = pkgs.system;
+	inherit (pkgs.stdenv) isDarwin isLinux;
+in {
 	imports = [
 	]
-	++ (if (lib.strings.hasSuffix "darwin" "nope") then [./darwin] else [])
-	++ (if (lib.strings.hasSuffix "linux" "linux") then [./linux] else []);
+	++ (if (isLinux) then [./linux] else []);
 
 	# Enable flakes
 	nix = {
@@ -20,7 +20,7 @@ let
 		};
 
 		settings = {
-			auto-optimise-store = (if lib.strings.hasSuffix "darwin" pkgs.system then false else true);
+			auto-optimise-store = true;
 			experimental-features = "nix-command flakes";
 			keep-outputs = true;
 			keep-derivations = true;