this derivation will be built:
  /nix/store/yah9l3llbmrb81rpa533cfbs1hq13ap0-bcachefs-module-7.0.0-38-generic.drv
building '/nix/store/yah9l3llbmrb81rpa533cfbs1hq13ap0-bcachefs-module-7.0.0-38-generic.drv'...