these 3 derivations will be built:
  /nix/store/b5dzjqsk46lna9bc1yppfb8nqx92gkn1-source.drv
  /nix/store/5phj5pfi64v6bw55k0ykd0jkz430mh46-mcptoon-0.8.20.drv
  /nix/store/5al3jxkk07nbal7sp0k792m5x34nx5xm-check-mcptoon.drv