these 2 derivations will be built:
  /nix/store/vbxab6h95mj1nxwaqx4rvqws3iizal6l-mcptoon-0.8.4.drv
  /nix/store/7rjm4yg7pz6y890sr1rvn6y2dl2h9yvh-check-mcptoon.drv