# Pastebin Y4mYJygP
nix-build '<nixpkgs>' -A linux --argstr system x86_64-linux                   
these paths will be fetched (47.54 MiB download, 55.96 MiB unpacked):
  /nix/store/y0g241g72wcn3vlq4f0k0va2kbz657lf-linux-4.9.76
fetching path ‘/nix/store/y0g241g72wcn3vlq4f0k0va2kbz657lf-linux-4.9.76’...

*** Downloading ‘https://cache.nixos.org/nar/0syfyq6s1hyq5z3mw0b5jkbq0jvqf7w0449gk2lvknb8fb3y0wpf.nar.xz’ (signed by ‘cache.nixos.org-1’) to ‘/nix/store/y0g241g72wcn3vlq4f0k0va2kbz657lf-linux-4.9.76’...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 47.5M  100 47.5M    0     0  4867k      0  0:00:10  0:00:10 --:--:-- 5923k

/nix/store/y0g241g72wcn3vlq4f0k0va2kbz657lf-linux-4.9.76