these 3 derivations will be built:
  /nix/store/kbf635xhjq8lb2mjj9yy8bdywc8ypg7l-source.drv
  /nix/store/f9ghblxc9qvmfzglaz1qkljhw9pbhbk6-mcptoon-0.8.33.drv
  /nix/store/yrvcv7y0q3fnw4xsp0gj65asq8zj5160-check-mcptoon.drv