these 3 derivations will be built:
  /nix/store/py7j0hd3jk28pwrigydbnf2vj6vdri8f-aven-0.1.28-vendor-staging.drv
  /nix/store/hc2ahs188cfrvijhk2mha7dwvh7v1bqi-aven-0.1.28-vendor.drv
  /nix/store/rad2wcldll2xypq7gs1ar8229a02xywx-aven-0.1.28.drv