these 3 derivations will be built:
  /nix/store/sq4w8fs7ixczj5a25hpphmzj1y2kv803-source.drv
  /nix/store/xhc3g1rng5f88h1vfih43j6az7w69is6-mcptoon-0.8.3.drv
  /nix/store/yp4yia43rlj99jaix49fbyqx9cz8dc40-check-mcptoon.drv