{ pkgs, namespace, ... }:
{
  nixpkgs.overlays = [
    (_self: super: {
      ${namespace} =
        let
          # clangCcacheStdenv = super.overrideCC super.llvmPackages.stdenv (
          #   super.ccacheWrapper.override {
          #     cc = super.llvmPackages.stdenv.cc;
          #     extraConfig = ''
          #       export CCACHE_SLOPPINESS=include_file_ctime,time_macros
          #       export CCACHE_DIR=/var/cache/ccache
          #     '';
          #   }
          # );
          clangCcacheStdenv = pkgs.llvmPackages.stdenv; # pkgs.overrideCC pkgs.clangStdenv (pkgs.ccacheWrapper.override { cc = pkgs.llvmPackages.clangUseLLVM; });
        in
        super.${namespace}
        // {
          linuxPackages_rpi5 = super.linuxPackagesFor (
            super.${namespace}.linux-rpi.override { stdenv = super.ccacheStdenv; }
          );
          linuxPackages_rpi4 = super.linuxPackagesFor (
            super.${namespace}.linux-rpi.override {
              stdenv = super.ccacheStdenv;
              rpiVersion = 4;
            }
          );
          libraspberrypi = super.${namespace}.libraspberrypi.override { stdenv = super.ccacheStdenv; };
          raspberrypi-utils = super.${namespace}.raspberrypi-utils.override { stdenv = super.ccacheStdenv; };

          linuxPackages_cachyos = super.${namespace}.linuxPackages_cachyos.override {
            stdenv = super.ccacheStdenv;
          };
          # linuxPackages_cachyos-lto = super.${namespace}.linuxPackages_cachyos-lto.override {
          #   stdenv = clangCcacheStdenv;
          # };
          # linuxPackages_cachyos-lto-full = super.${namespace}.linuxPackages_cachyos-lto-full.override {
          #   stdenv = clangCcacheStdenv;
          # };
          linuxPackages_cachyos-lts = super.${namespace}.linuxPackages_cachyos-lts.override {
            stdenv = super.ccacheStdenv;
          };
          # linuxPackages_cachyos-lts-lto = super.${namespace}.linuxPackages_cachyos-lts-lto.override {
          #   stdenv = clangCcacheStdenv;
          # };
          # linuxPackages_cachyos-lto-znver4 = super.${namespace}.linuxPackages_cachyos-lto-znver4.override {
          #   stdenv = clangCcacheStdenv;
          # };
          linuxPackages_cachyos-server = super.${namespace}.linuxPackages_cachyos-server.override {
            stdenv = super.ccacheStdenv;
          };
          # linuxPackages_cachyos-server-lto = super.${namespace}.linuxPackages_cachyos-server-lto.override {
          #   stdenv = clangCcacheStdenv;
          # };
          # linuxPackages_cachyos-server-lto-znver4 =
          #   super.${namespace}.linuxPackages_cachyos-server-lto-znver4.override
          #     { stdenv = clangCcacheStdenv; };
          linuxPackages_cachyos-rc = super.${namespace}.linuxPackages_cachyos-rc.override {
            stdenv = super.ccacheStdenv;
          };
          # linuxPackages_cachyos-rc-lto = super.${namespace}.linuxPackages_cachyos-rc-lto.override {
          #   stdenv = clangCcacheStdenv;
          # };
          # linuxPackages_cachyos-rc-lto-znver4 =
          #   super.${namespace}.linuxPackages_cachyos-rc-lto-znver4.override
          #     { stdenv = clangCcacheStdenv; };
          linuxPackages_cachyos-hardened = super.${namespace}.linuxPackages_cachyos-hardened.override {
            stdenv = super.ccacheStdenv;
          };
          # linuxPackages_cachyos-hardened-lto =
          #   super.${namespace}.linuxPackages_cachyos-hardened-lto.override
          #     { stdenv = clangCcacheStdenv; };
          # linuxPackages_cachyos-hardened-lto-znver4 =
          #   super.${namespace}.linuxPackages_cachyos-hardened-lto-znver4.override
          #     { stdenv = clangCcacheStdenv; };
          linuxPackages_cachyos-deckify = super.${namespace}.linuxPackages_cachyos-deckify.override {
            stdenv = super.ccacheStdenv;
          };
          # linuxPackages_cachyos-deckify-lto = super.${namespace}.linuxPackages_cachyos-deckify-lto.override {
          #   stdenv = clangCcacheStdenv;
          # };
        };
    })

    (_self: super: {
      raspberrypi-utils = super.${namespace}.raspberrypi-utils;
      raspberrypi-udev-rules = super.${namespace}.udev-rules;
    })
    (_self: super: {
      mesa = super.mesa.override { buildPackages.stdenv = super.ccacheStdenv; };
    })
    (_self: super: {
      electron = super.stable.electron-bin;
      electron_36 = super.stable.electron_36-bin;
      electron_37 = super.stable.electron_37-bin;
    })
    # (_self: super: {
    #   "webkitgtk_4_1" = super.stable."webkitgtk_4_1".override { clangStdenv = super.ccacheStdenv; };
    # })
    # (_self: super: {
    #   "webkitgtk_6_0" = super."webkitgtk_6_0".override { clangStdenv = super.ccacheStdenv; };
    # })
    (_self: super: {
      "jellyfin-ffmpeg" = super."jellyfin-ffmpeg".override {
        ffmpeg_7-full = super.ffmpeg_7-full.override { stdenv = super.ccacheStdenv; };
      };
    })
    # (self: super: {
    #   "ffmpeg-headless-rpi" = super."ffmpeg-headless-rpi".override { ffmpeg = super.ffmpeg_7.override { stdenv = super.ccacheStdenv; }; };
    # })

    # todo: make these work
    (_self: super: {
      rocmPackages = super.stable.rocmPackages;
      uv = super.stable.uv;
      piper-tts = super.stable.piper-tts;
      python3Packages = super.python3Packages // {
        torch = super.stable.python3Packages.torch;
      };
    })
    # (_self: super: {
    #   rocmPackages = super.rocmPackages // {
    #     hipblaslt = super.rocmPackages.hipblaslt.override {
    #       stdenv = super.ccacheStdenv;
    #       inherit gpuTargets;
    #     };
    #     rocblas = super.rocmPackages.rocblas.override {
    #       # stdenv = super.ccacheStdenv;
    #       inherit gpuTargets;
    #     };
    #     rocsolver = super.rocmPackages.rocsolver.override {
    #       # stdenv = super.ccacheStdenv;
    #       inherit gpuTargets;
    #     };
    #   };
    # })
    (_self: super: {
      pcsx2 = super.pcsx2.override {
        llvmPackages = super.llvmPackages // {
          stdenv = super.ccacheStdenv;
        };
      };
    })
    (_self: super: {
      driversi686Linux = super.driversi686Linux // {
        mesa = super.driversi686Linux.mesa.override {
          stdenv = super.ccacheStdenv;
          buildPackages = super.driversi686Linux.mesa.buildPackages // {
            stdenv = super.ccacheStdenv;
          };
        };
      };
    })
    (_self: super: {
      kdePackages = super.kdePackages // {
        qt3d = super.kdePackages.qt3d.override {
          qtbase = super.kdePackages.qtbase.override { stdenv = super.ccacheStdenv; };
        };
        qtwebengine = super.stable.kdePackages.qtwebengine; # .override { stdenv = super.ccacheStdenv; };
      };
    })
    # (_self: super: {
    #   python3Packages = super.python3Packages // {
    #     torch = super.python3Packages.torch.override {
    #       stdenv = super.ccacheStdenv;
    #       inherit gpuTargets;
    #     };
    #   };
    # })
    # (_self: super: {
    #   piper-tts = super.piper-tts.overridePythonAttrs (oldAttrs: {
    #     pythonCatchConflictsPhase = null;
    #   });
    # })
  ];
}