this derivation will be built:
  /nix/store/4fn45fwz258mda9hin73rf3hkd2bb10z-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/4fn45fwz258mda9hin73rf3hkd2bb10z-bcachefs-module-7.0.0-39-generic.drv'...