these 3 derivations will be built:
  /nix/store/mkdafxi68iwmw45llj9k3q0xa2ba1pqj-source.drv
  /nix/store/mkwf1bl4gk1cs7z33m5df6mdk8xa1wfi-mcptoon-0.8.31.drv
  /nix/store/idvl6ppzws2njpzwvz7qqs537l3g4jbv-check-mcptoon.drv