unpacking 'https://github.com/NixOS/nixpkgs/archive/624af665418d3c65d544145b4d34ad696439570e.tar.gz' into the Git cache...
this derivation will be built:
  /nix/store/hw0xbhqbal1qq03b5zd58r3fk5442mx1-bcachefs-module-6.18.40-3-lts.drv
these 2 paths will be fetched (227.37 MiB download, 614.40 MiB unpacked):
  /nix/store/2l5dzw3ysxx0n8v6kbixcyg0kvlx53d9-linux-6.18.40
  /nix/store/4j423x0vswmpc6bl42k57byh58xa8a7z-linux-6.18.40-dev
copying path '/nix/store/2l5dzw3ysxx0n8v6kbixcyg0kvlx53d9-linux-6.18.40' from 'https://cache.nixos.org'...
copying path '/nix/store/4j423x0vswmpc6bl42k57byh58xa8a7z-linux-6.18.40-dev' from 'https://cache.nixos.org'...
warning: download buffer is full; consider increasing the 'download-buffer-size' setting
building '/nix/store/hw0xbhqbal1qq03b5zd58r3fk5442mx1-bcachefs-module-6.18.40-3-lts.drv'...