{
  root,
  inputs,
  ...
}: {
  nixpkgs.channels.default = {
    # nixpkgs (stable branch)
    pkgs = {
      source = inputs.nixpkgs;
      overlays =
        [inputs.dobutterfliescry-net.overlays.default]
        ++ import (root + "/overlays");
      config = {
        allowUnfree = false;
        allowBroken = false;
      };
    };
    # nixpkgs-unstable
    upkgs = {
      source = inputs.nixpkgs-unstable;
      config = {
        allowUnfree = false;
        allowBroken = false;
      };
    };
  };
}