{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  inputs.emacs-overlay.url = "github:nix-community/emacs-overlay";
  inputs.emacs-overlay.inputs.nixpkgs.follows = "nixpkgs";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, nixpkgs, flake-utils, emacs-overlay }: let
    mkEmacs = pkgs: v: pkgs.emacsWithPackagesFromUsePackage {
      config = ./main.org;
      package = pkgs."${v}${if pkgs.stdenv.isDarwin then "-macport" else "-pgtk"}";
    };    
  in (flake-utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [
          emacs-overlay.overlays.default
        ];
      };
    in {
      packages = {
        me-emacs = mkEmacs pkgs "emacs29";
      };
    })) // {
      overlays.default = final: prev: (emacs-overlay.overlays.default final prev) // {
        me-emacs = mkEmacs final "emacs29";
      };      
    };
}