added unstablePkgs module option

modules/features/distcc/default.nix

@@ -0,0 +1,20 @@
+{
+	self,
+  moduleWithSystem,
+  ...
+}: {
+  flake.nixosModules.name = moduleWithSystem ({
+    pkgs,
+    self',
+		inputs',
+    ...
+  }: let
+    modules = with self.nixosModules; [];
+  in {
+    imports = modules;
+    programs.name = {
+      enable = true;
+      package = self'.packages.hello;
+    };
+  });
+}

modules/system/core/nix-settings.nix

@@ -5,6 +5,9 @@
         inherit system;
         config.allowUnfree = true;
       };
+      unstablePkgs = import inputs.nixpkgs-unstable {
+        inherit system;
+      };
       # Make flakeLocation universally addressable
       flakeLocation = builtins.getEnv "PWD";
     };