ccache?

modules/nixos/nix/default.nix

@@ -5,8 +5,39 @@
   ...
 }:
 {
+  programs.ccache = {
+    enable = true;
+    packageNames = [
+      "ffmpeg"
+      "ffmpeg-headless-rpi"
+      "gjs"
+      "gst-plugins-bad"
+      "gtk4"
+      "jemalloc"
+      "libcamera-rpi"
+      "libraspberrypi"
+      "libsecret"
+      "linux"
+      "pipewire"
+      "qemu"
+      "raspberrypi-utils"
+      "sdl"
+      "sdl2"
+      "uv"
+      # "yubioath-flutter"
+    ];
+    cacheDir = "/var/cache/ccache";  # default location
+  };
+
+  # nixpkgs.overlays = [
+  #   (self: super: {
+  #     "yubioath-flutter" = super."yubioath-flutter".override { stdenv = super.ccacheStdenv; };
+  #   })
+  # ];
+
   nix = {
     settings = {
+      extra-sandbox-paths = [ config.programs.ccache.cacheDir ];
       substituters = [
         "https://cache.mjallen.dev/nas-cache"
         "https://nixos-raspberrypi.cachix.org"