these 3 derivations will be built:
  /nix/store/zz25b99wirjw5kmzffzkqi94nwzsgnqk-source.drv
  /nix/store/rvqpg81pfaimg8hk2pywdshm30sgm5gi-mcptoon-0.8.35.drv
  /nix/store/s9w0ilr02vlvfn5q9rc3drnm6khpbz01-check-mcptoon.drv