unpacking 'https://github.com/NixOS/nixpkgs/archive/18b9261cb3294b6d2a06d03f96872827b8fe2698.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/kpwn87pdpc67npydsczv5ff0wzwxs48g-bcachefs-module-7.1.3-arch2-1.drv
building '/nix/store/kpwn87pdpc67npydsczv5ff0wzwxs48g-bcachefs-module-7.1.3-arch2-1.drv'...