this derivation will be built:
  /nix/store/anc9qi44ppz6faqfjaiabpzsrzb3vzja-bcachefs-module-7.0.0-38-generic.drv
building '/nix/store/anc9qi44ppz6faqfjaiabpzsrzb3vzja-bcachefs-module-7.0.0-38-generic.drv'...