these 3 derivations will be built:
  /nix/store/xvrxh3naggh8d1lrgg0zlmficb5xzbmv-source.drv
  /nix/store/ibdwgiqjpw0p3lxn158gm36lsjkrxhvf-mcptoon-0.8.27.drv
  /nix/store/7wrgbgi4q5f5f0c057ql32k8chxgz59y-check-mcptoon.drv