final: prev:
let
  inherit (prev.lib)
    mapAttrs'
    removeSuffix
    ;
in
mapAttrs' (name: _: {
  value = final.callPackage ./pkgs/${name} { };
  name = removeSuffix ".nix" name;
}) (builtins.readDir ./pkgs)
// {
  formats = prev.formats // {
    xml = import ./xml.nix { pkgs = final; };
  };
  pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [ (import ./python_overlay.nix) ];
}