{
  systemsAttributes,
  nixpkgs,
  nixpkgs-darwin,
  self,
  inputs,
}:
{
  nixpkgsAllowUnfree ? false,
  nixpkgsCudaSupport ? false,
  nixpkgsAllowUnfreePredicate ? [ ],
  nixpkgsExtraConfig ? { },
  nixpkgsIsDarwin ? false,
}:
(systemsAttributes (
  system:
  import (if nixpkgsIsDarwin then nixpkgs-darwin else nixpkgs) {
    inherit system;

    overlays = (import "${self}/lib/overlays.nix" { inherit self; }) ++ [
      (_final: _prev: {
        tsutsumi = inputs.tsutsumi.packages.${system};
      })
    ];

    config = {
      allowUnfree = nixpkgsAllowUnfree;
      cudaSupport = nixpkgsCudaSupport;
      allowUnfreePredicate = nixpkgsAllowUnfreePredicate;
    } // nixpkgsExtraConfig;
  }
))