{

  inputs = {
    # TODO(jwall): Pinning this to a fixed version of lua on darwin for now.
    nixpkgs.url = "github:nixos/nixpkgs?ref=22.05-beta";
    darwin.url = "github:lnl7/nix-darwin";
    darwin.inputs.nixpkgs.follows = "nixpkgs";
    runwhen.url = "github:zaphar/runwhen?ref=v0.0.5";
    durnitisp.url = "github:zaphar/durnitisp";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    jj.url = "github:martinvonz/jj";
  };

  outputs = {self, nixpkgs, darwin, runwhen, durnitisp, rust-overlay, jj }:
  let
    forSystem = (system:
      let
        pkgs = import nixpkgs { inherit system; };
      in
      darwin.lib.darwinSystem rec {
        inherit system;
        modules = [
          ./darwin-configuration.nix
        ];
        inputs = {
          runwhen = runwhen.defaultPackage."${system}";
          durnitisp = durnitisp.defaultPackage."${system}";
          rust-overlay = rust-overlay.overlay;
          #TODO(jwall): when the libtexpdf issue is fixed we can stop doing this
          sile = pkgs.sile.overrideAttrs(oldAttrs: { doCheck = false; });
          jj = jj.defaultPackage."${system}";
        };
      });
  in
   {
    darwinConfigurations."jeremys-mbp" = forSystem "aarch64-darwin";
    darwinConfigurations."jeremys-mbpx86" = forSystem "x86_64-darwin";
   };
}