these 3 derivations will be built:
  /nix/store/bjdrsxh1cs25vhzlk05k9s85g0ynz8sb-source.drv
  /nix/store/d1jrrn0m7al2dsdyzf39wim1frf2fmxv-mcptoon-0.8.36.drv
  /nix/store/vfija62vkf1ms2rfc9vgbd8q9gn70iv2-check-mcptoon.drv