# taken from raf
{sources, ...}: {
  # Global nixpkgs configuration.
  # This is ignored if nixpkgs.pkgs is set, which should be avoided.
  nixpkgs = {
    flake = {
      source = sources.nixpkgs;
      setFlakeRegistry = true;
      setNixPath = true;
    };

    # Configuration reference:
    # <https://nixos.org/manual/nixpkgs/unstable/#chap-packageconfig>
    config = {
      # Disallow broken packages to be built.
      allowBroken = false;

      allowUnsupportedSystem = true;

      # Warn when config contains an unrecognized attribute.
      # This might be useful for getting a better configuration.
      warnUndeclaredOptions = true;

      # Allow unfree packages
      allowUnfree = true;

      # Permitted insecure packages in a system.
      # Default to none, add more as necessary.
      # Matrix also likes using deprecated libraries, which tend to go into this list.
      # permittedInsecurePackages = [];

      # Whether to set enableParallelBuilding to true by default while
      # building nixpkgs packages. Changing the default causes a mass rebuild.
      enableParallelBuildingByDefault = false;

      # Whether to expose old attribute names for compatibility.
      # This improves backwards compatibility,
      # which I could not care less about in my configuration.
      allowAliases = false;

      # List of derivation warnings to display while rebuilding.
      #  See: <https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/check-meta.nix>
      showDerivationWarnings = [];
    };
  };
}