these 3 derivations will be built:
  /nix/store/gx9g914ysrdf9kxw7czgxlw64dsswxxr-source.drv
  /nix/store/4p3d897zm6k1fllbi24p7p50g7j7xqls-mcptoon-0.8.0.drv
  /nix/store/q6qrqp9k3db6aklml3md0jh2570cg3h4-check-mcptoon.drv