this works

flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "My NixOS / nix-darwin / nixos-generators systems";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
+    unstable.url = "github:nixos/nixpkgs/nixos-unstable";
+
+    home-manager = {
+      url = "github:nix-community/home-manager/release-23.11";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    snowfall-lib = {
+      url = "github:snowfallorg/lib";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    snowfall-flake = {
+      url = "github:snowfallorg/flake";
+      inputs.nixpkgs.follows = "unstable";
+    };
+  };
+
+  outputs = inputs:
+    inputs.snowfall-lib.mkFlake {
+      inherit inputs;
+      src = ./.;
+
+      channels-config = {allowUnfree = true;};
+
+      outputs-builder = channels: {formatter = channels.nixpkgs.alejandra;};
+
+      overlays = with inputs; [
+        # Use the overlay provided by this flake.
+        snowfall-flake.overlays."package/flake"
+      ];
+    };
+}