{ nixpkgs, nixpkgs-unstable, nur, ... }@inputs:
let
  overlay-unstable = final: prev: {
    unstable = import nixpkgs-unstable { config.allowUnfree = true; system = prev.system; };
    x86 = import nixpkgs-unstable { system = prev.system; config.allowUnsupportedSystem = true; };
  };
  overlay-needs-unstable = final: prev: {
    # override some packages that needs unstable that cannot be changed in the setup.
    nix-direnv = prev.unstable.nix-direnv;
  };
  overlay-imported = final: prev: {
    rnix-lsp = inputs.rnix-lsp.defaultPackage."${prev.system}";

    # A list of source-style inputs.
    sources = final.lib.attrsets.filterAttrs (name: f: !(builtins.hasAttr "outputs" f)) inputs;
  };

  overlay-versioning = final: prev: { };

  overlay-libs = final: prev: {
    libs.crane = inputs.crane.lib.${prev.system};
  };

  overlay-aarch64-linux = final: prev:
    {
      fd =
        if prev.system == "aarch64-linux" then
          prev.fd.overrideAttrs
            (attrs:
              {
                preBuild = ''
                  export JEMALLOC_SYS_WITH_LG_PAGE=16
                '';
              }) else prev.fd;

    };

  overlay-asahi = inputs.nixos-m1.overlays.default;
in
[
  (import ./overlays/openrazer)
  overlay-unstable
  overlay-needs-unstable
  overlay-imported
  overlay-versioning
  overlay-libs
  overlay-asahi
  overlay-aarch64-linux
  nur.overlay

  # Bug fixes
] # we assign the overlay created before to the overlays of nixpkgs.