these 3 derivations will be built:
  /nix/store/2rfhbgayrh464kyrbdadcv8wp9ln5ji0-source.drv
  /nix/store/cfhr0dmv5x9vmyr9scagmlczihxc2k3i-mcptoon-0.8.11.drv
  /nix/store/c752vn42njdw1lbpjl8am9fz43snpqq7-check-mcptoon.drv