this derivation will be built:
  /nix/store/9l4h6xxndmn2qchyv8r5maswgykdhvkc-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/9l4h6xxndmn2qchyv8r5maswgykdhvkc-bcachefs-module-7.0.0-39-generic.drv'...