Adapt for the current wat

machines/foobar/default.nix

 { mkMachine, flakes, ... }:
 
-mkMachine flakes.nixpkgs "x86_64-linux" ({ pkgs, ... }: {
+mkMachine {
+  # These are the defaults.
+  #nixpkgs = flakes.nixpkgs;
+  #system = "x86_64-linux";
+  #loadModules = [];
+} ({ pkgs, ... }: {
 
   # your system here
   fileSystems."/" = {