inputs@{
  nixpkgs,
  self,
  ...
}:
let
  forSelfOverlay =
    if builtins.hasAttr "overlays" self && builtins.hasAttr "forSelf" self.overlays then
      self.overlays.forSelf
    else
      (_: p: p);
in
rec {
  systems = [
    "aarch64-linux"
    "x86_64-linux"
    "x86_64-darwin"
    "aarch64-darwin"
  ];
  forSystems = nixpkgs.lib.genAttrs systems;
  pkgsFor = system: ((import nixpkgs { inherit system; }).extend forSelfOverlay);
  genPkgs = func: (forSystems (system: func (pkgsFor system)));
  call = imported: genPkgs (pkgs: imported (inputs // { inherit pkgs; }));
}