{ storepath_length ? 30, storepath_chunks ? 4, pkgs ? import <nixpkgs> {
  stdenvStages = { config, overlays, localSystem, ... }@args: (import <nixpkgs/pkgs/stdenv> args) ++ [
    (previousStage: {
      inherit config overlays;
      stdenv = let
        toPreHook = withAppendOut: ''
              storepath_length=${toString storepath_length}
              storepath_chunks=${toString storepath_chunks}
          '' + builtins.readFile ./prehook.sh + (pkgs.lib.optionalString withAppendOut ''
              appendOut
          '');
        newlibunistring = previousStage.libunistring.overrideAttrs (attrs: {
          preHook = attrs.preHook or "" + (toPreHook true);
          am_cv_func_iconv_works = "yes";
        });
        newlibidn2 = (previousStage.libidn2.override { libunistring = newlibunistring; }).overrideAttrs (attrs: {
          preHook = attrs.preHook or "" + (toPreHook true);
          postFixup = ''
            ${previousStage.nukeReferences}/bin/nuke-refs -e $(cat ${newlibunistring}/nix-support/new-out)/lib \
              "$out"/lib/lib*.so.*.*
          '';
        });
        overridenCallPackage = p: a: previousStage.callPackage p (a // { libidn2 = newlibidn2;});

        newlibc = (previousStage."${localSystem.libc}".override { callPackage = overridenCallPackage; }).overrideAttrs(old: {
          preHook = old.preHook or "" + (toPreHook true);
        });
        newbintools = (previousStage.binutils.override { libc = newlibc; }).overrideAttrs(old: {
          postFixup = old.postFixup + ''
            newlibcout=$(cat ${newlibc}/nix-support/new-out)
            sed -i -e "s@${newlibc}@$newlibcout@g" $out/nix-support/*
          '';
        });
        newStdenv = previousStage.stdenv.override {
          allowedRequisites = null;
          extraAttrs.bintools = newbintools;
          cc = previousStage.gcc.override({ bintools = newbintools; libc = newlibc; });
          overrides = self: super: rewriteMap (previousStage.stdenv.overrides self super) // {
            ${localSystem.libc} = newlibc;
          };
          preHook = previousStage.stdenv.preHook + ''
              libc_path=${newlibc}
            '' + (toPreHook false);
        };
        rewriteMap = builtins.mapAttrs (n: v: v.override { stdenv = newStdenv; });
      in
        newStdenv;
      })
    ];
} }:
  pkgs.xar