these 3 derivations will be built:
  /nix/store/jfkhq0fvc5w7i40iajgfii47qzijifnv-source.drv
  /nix/store/0rj885a18h8nnmknhja9kdbdr8j3v6m0-mcptoon-0.8.40.drv
  /nix/store/yqa8233cfircyzc82hwfmj8ag811pvr9-check-mcptoon.drv