[Nix-dev] PLease help to grok the code

[Sergey Mironov]

top-level/all-packages.nix:32
(https://nixos.org/websvn/nix/nixpkgs/trunk/pkgs/top-level/all-packages.nix)

defines 'config' parameter. Where does it come from when I type
'nixos-rebuild switch'? NIXPKGS_CONFIG is set to /nix/etc/config.nix but
there is no such file! I am screwed up.. How should I change
those getConfig X Y behaviour in , eg.

  emacs22 = callPackage ../applications/editors/emacs-22 {
    stdenv = overrideGCC stdenv gcc44;
    xaw3dSupport = getConfig [ "emacs" "xaw3dSupport" ] false;
    gtkGUI = getConfig [ "emacs" "gtkSupport" ] true;
  };

??
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