error: duplicate formal function argument ‘gconf’ at /home/aprokurov/.config/nixpkgs/f57.nix:1:11

[aprokurov@nixos:~]$ nix-env -iA nixos.f57
error: syntax error, unexpected ',', expecting '}', at /home/aprokurov/.config/nixpkgs/f57.nix:1:11

[aprokurov@nixos:~]$ nix-env -iA nixos.f57
error: anonymous function at /home/aprokurov/.config/nixpkgs/f57.nix:1:1 called without required argument ‘gconf’, at /home/aprokurov/.nix-defexpr/channels_root/nixos/lib/customisation.nix:74:12