{
  description = "A simple NixOS flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
    helix.url = "github:helix-editor/helix/master";
    hyprland.url = "github:hyprwm/Hyprland";
    home-manager = {
      url = "github:nix-community/home-manager/release-25.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, home-manager, ... }@inputs:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs {
        inherit system;
        config.allowUnfree = true;
      };

    in {
      nixosConfigurations.haskell = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        specialArgs = { inherit inputs; };
        modules = [
          ./configuration.nix

          ({ pkgs, ... }: {
            # Define the overlay inline or in a separate file
            nixpkgs.overlays = [
              (final: prev: {
                openmodelica = final.callPackage ./nixpkgs/openmodelica.nix { };
              })
            ];
          })
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;

            home-manager.users.allen = import ./home.nix {
              inherit inputs;
              inherit pkgs;
            };
          }
        ];
      };
    };
}