these 2 derivations will be built:
  /nix/store/zva5yfwz0gkc01i7gyl8zxlazqzij4fk-source.drv
  /nix/store/wyjg8i8ql0jp4xs7qqjj36wl4mwv2k2w-mcptoon-0.5.3.drv