these 3 derivations will be built:
  /nix/store/8v587ckmjw1bi10kzb76lxy4fl5cm45d-openfang-0.6.9-vendor.drv
  /nix/store/sqbx44776vniff2kc7w7ijxvy9hay708-openfang-0.6.9.drv
  /nix/store/3v661w6nq6vw4kz2808lzkzsl32k4j4l-check-openfang.drv