these 3 derivations will be built:
  /nix/store/wib980w4qp1x1zkjckhby7xizafwin2j-openfang-0.6.9-vendor.drv
  /nix/store/1vb5hwrj95f72knh09j0knsprd2dkrrr-openfang-0.6.9.drv
  /nix/store/8g291s3d0jsmdc2iwf5c5varwkpsfayp-check-openfang.drv