these 3 derivations will be built:
  /nix/store/04fy25bwmdb7q0n1drkqwl780w72jixl-source.drv
  /nix/store/2x9v2k6x3xasnfcm5hqpl7wmg2sfkvf6-mcptoon-0.8.3.drv
  /nix/store/pvggybffyb0xj2p66f4471wvdjmzhp52-check-mcptoon.drv