these 2 derivations will be built:
  /nix/store/w50i187z6pb35hyfl0m2mmxz2jv34r3i-openfang-0.6.9-vendor.drv
  /nix/store/q1zgdjsjx84m8mxcx9m90y7f9wfqv7yy-openfang-0.6.9.drv