3956435d0a
`configuration` seems to be a reference to an argument that was removed seven years ago in commit 2892aed7. `configuration.nix` makes it a big more clear what we're referring to.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.