these 3 derivations will be built:
  /nix/store/rh353imlr7j1phy6ld8631gcw2znbj14-herdr-core-0.1.21-vendor.drv
  /nix/store/cfr1fd5kxkd2q1pp0xwdy1qi9n9miz8b-herdr-core-0.1.21.drv
  /nix/store/nxma0xdwvdh0r83n8in8lbqsj02kzyw2-check-herdr-core.drv