this derivation will be built:
  /nix/store/5vqjdhfw9hzj1h9l6s1grm81syq6492w-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/5vqjdhfw9hzj1h9l6s1grm81syq6492w-bcachefs-module-7.0.0-39-generic.drv'...