these 3 derivations will be built:
  /nix/store/vkkhn8wcygbdqbwwgmdfpapf0nzswnyf-toon-format-0.6.1-vendor.drv
  /nix/store/32v26rzq0j47b3dv9hi6jm6d0l99ci61-toon-format-0.6.1.drv
  /nix/store/zly82bdr2kxb0z34fznpqm3xc683h042-check-toon.drv