{
  pkgs,
  lib,
  pkgs-unstable,
}:
pkgs.runCommand "otp"
  {
    code = ./otp.cr;
    env = {
      YKMAN = lib.getExe pkgs-unstable.yubikey-manager;
      SKIM = lib.getExe pkgs.skim;
      WALKER = lib.getExe pkgs-unstable.walker;
      WL_COPY = lib.getExe' pkgs.wl-clipboard "wl-copy";
      NOTIFY_SEND = lib.getExe pkgs.libnotify;
      NOTIFY_ICON = "${pkgs-unstable.yubioath-flutter}/share/pixmaps/com.yubico.yubioath.png";
    };
    nativeBuildInputs = [ pkgs.crystal ];
  }
  ''
    mkdir -p $out/bin
    crystal build $code --release -o $out/bin/otp
  ''