this derivation will be built:
  /nix/store/7xq42n8v9a9v3swkza13zghzqx055y7f-bcachefs-module-7.0.0-38-generic-64k.drv
building '/nix/store/7xq42n8v9a9v3swkza13zghzqx055y7f-bcachefs-module-7.0.0-38-generic-64k.drv'...