{
  outputs = { self, nixpkgs }: {
    packages.aarch64-darwin = let
      pkgs = import nixpkgs { system = "aarch64-darwin"; };
    in {
      default = pkgs.stdenv.mkDerivation {
        name = "ssh-askpass-pinentry";
        src = ./.;

        inherit (pkgs) pinentry_mac;

        installPhase = ''
          mkdir -p $out/libexec
          substitute ./ssh-askpass $out/libexec/ssh-askpass --subst-var pinentry_mac
          chmod +x $out/libexec/ssh-askpass
        '';
      };
    };
  };
}