unpacking 'https://github.com/NixOS/nixpkgs/archive/c043004d1c6985732bcc1cbc5a9c9aecbbb4e0f0.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/y2capar844h8qj9x7j5x5kqd9f9qaynf-bcachefs-module-6.18.49-3-lts.drv
this path will be fetched (213.51 MiB download, 593.78 MiB unpacked):
  /nix/store/8gsy6nldplfw12ylblabahhay8bv8xfx-linux-6.18.49-dev
copying path '/nix/store/8gsy6nldplfw12ylblabahhay8bv8xfx-linux-6.18.49-dev' from 'https://cache.nixos.org'...
building '/nix/store/y2capar844h8qj9x7j5x5kqd9f9qaynf-bcachefs-module-6.18.49-3-lts.drv'...