these 2 derivations will be built:
  /nix/store/d6bh3pdmb1nqcnbf4p1c2ls3hb9m09h2-gnhf-0.1.51.drv
  /nix/store/r3fknfbq9wagk1lvncsidv1l6kgn7xrc-check-gnhf.drv