this derivation will be built:
  /nix/store/81drjf9dwkq48vi7vvvjxbaxr91nw4f4-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/81drjf9dwkq48vi7vvvjxbaxr91nw4f4-bcachefs-module-7.0.0-39-generic.drv'...