these 3 derivations will be built:
  /nix/store/pc0n5j0qyjwc0x1g315xc01l4f2snvrx-source.drv
  /nix/store/wxgiq8ac8lfs925mqs04hrqsrmms8sfz-mcptoon-0.8.22.drv
  /nix/store/jnkljrhh9w57ijd3ms1aqwasgv200phg-check-mcptoon.drv