Continue to fix merge

modules/darwin.nix

@@ -0,0 +1,18 @@
+{ config, lib, ... }:
+
+let
+	cfg = config.greg.darwin;
+
+in with lib; {
+	options = {
+		greg.darwin = mkEnableOption "This system is Darwin";
+	};
+
+	config = mkIf cfg {
+		system.stateVersion = 4;
+		programs = {
+			zsh.enable = true;
+			bash.enable = true;
+		};
+	};
+}