{
  description = "Poetry2nix flake";

  outputs = { self, nixpkgs }:
    let
      # TODO: There must be a better way to provide arch-agnostic flakes..
      systems = [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
      # Memoize nixpkgs for different platforms for efficiency.
      nixpkgsFor = forAllSystems (
        system:
        import nixpkgs {
          inherit system;
          overlays = [ self.overlay ];
        }
      );
    in
    {
      overlay = import ./overlay.nix;

      packages = forAllSystems (system: {
        inherit (nixpkgsFor.${system}) poetry;
      }
      );

      apps = forAllSystems (system: {
        poetry = {
          type = "app";
          program = self.packages."${system}".poetry + "/bin/poetry";
        };
      });

      defaultApp = forAllSystems (system:
        self.apps."${system}".poetry
      );
    };
}