this derivation will be built:
  /nix/store/kgc421sanx86663lqrf9qg40jp2npqa4-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/kgc421sanx86663lqrf9qg40jp2npqa4-bcachefs-module-7.0.0-39-generic.drv'...