these 3 derivations will be built:
  /nix/store/zv63fzjk8civy299s9c78cszdfgjx9lf-source.drv
  /nix/store/x6ic6mza1sw7m4i8gyzaxsq7g65sjyhn-mcptoon-0.8.23.drv
  /nix/store/c07z3pf2h6hc5yhi1ppn3rxbb2hdx053-check-mcptoon.drv