this derivation will be built:
  /nix/store/k9qm9zfn904v070qm01wwp4bn44xmpyc-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/k9qm9zfn904v070qm01wwp4bn44xmpyc-bcachefs-module-7.0.0-39-generic.drv'...