unpacking 'https://github.com/NixOS/nixpkgs/archive/dc5d91f840324650bac8c379428c7037a416959a.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/l43zwj0ylgkl7a5nr23131v758g67naq-bcachefs-module-7.0.0-38-generic.drv
building '/nix/store/l43zwj0ylgkl7a5nr23131v758g67naq-bcachefs-module-7.0.0-38-generic.drv'...