this derivation will be built:
  /nix/store/21c5gcj4hggagf9kp094djvzb6083k6c-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/21c5gcj4hggagf9kp094djvzb6083k6c-bcachefs-module-7.0.0-39-generic.drv'...