unpacking 'https://github.com/NixOS/nixpkgs/archive/624af665418d3c65d544145b4d34ad696439570e.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/pbry6nqamk5aj7b02kchki6xv980v5nm-bcachefs-module-6.18.40-3-lts.drv
this path will be fetched (213.02 MiB download, 592.80 MiB unpacked):
  /nix/store/4j423x0vswmpc6bl42k57byh58xa8a7z-linux-6.18.40-dev
copying path '/nix/store/4j423x0vswmpc6bl42k57byh58xa8a7z-linux-6.18.40-dev' from 'https://cache.nixos.org'...
building '/nix/store/pbry6nqamk5aj7b02kchki6xv980v5nm-bcachefs-module-6.18.40-3-lts.drv'...