{
  description = "TeleportFling - standalone screen + audio sender for the OBS Teleport protocol";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        # Native/cgo build-time dependencies shared by both binaries.
        nativeBuildInputs = with pkgs; [
          go
          pkg-config
        ];

        # Libraries linked (or dlopened) by the capture/encode stack.
        # libpipewire is dlopened at runtime; libturbojpeg is linked.
        streamLibs = with pkgs; [
          libjpeg_turbo
          pipewire
          xdg-desktop-portal
        ];

        # Libraries required by the Fyne/GLFW GUI (cgo).
        guiLibs = with pkgs; [
          libGL
          mesa
          wayland
          libxkbcommon
          libX11
          libXrandr
          libXi
          libXcursor
          libXinerama
          libXxf86vm
        ];

        # Nix's libspa-0.2.pc emits -fno-strict-aliasing/-fno-strict-overflow
        # which Go's cgo rejects unless explicitly allowed.
        cgoFlagsAllow = "-fno-strict-overflow|-fno-strict-aliasing";

        # Common build environment so cgo finds headers/libs.
        buildEnv = pkg: {
          nativeBuildInputs = nativeBuildInputs;
          buildInputs = pkg;
          # Make turbojpeg resolve via pkg-config for cgo builds.
          PKG_CONFIG_PATH = "${pkgs.libjpeg_turbo.dev}/lib/pkgconfig";
          # Fyne/GLFW link against X11, Wayland, GL and misc libs. Go's cgo
          # linker does not read NIX_LDFLAGS, so expose the runtime lib dirs
          # via LIBRARY_PATH for the link step.
          LIBRARY_PATH = with pkgs; lib.makeLibraryPath (pkg);
          CGO_CFLAGS_ALLOW = cgoFlagsAllow;
        };

        # The headless CLI (no GLFW needed).
        teleportfling = pkgs.buildGoModule (buildEnv streamLibs // {
          pname = "teleportfling";
          version = "0.1.0";
          src = self;
          sourceRoot = self.sourceRoot or null;
          subPackages = [ "cmd/teleportfling" ];
          vendorHash = "sha256-1PDoL45BWhWNVX9wktR3WXpNbXJ+7V4mfp3la+Nv0wI=";

          postInstall = ''
            mkdir -p $out/share/applications
          '';

          meta = with pkgs.lib; {
            description = "Stream a screen and audio to OBS Teleport receivers";
            homepage = "https://gitea.edley.me/petere/TeleportFling";
            license = licenses.gpl2;
            mainProgram = "teleportfling";
            platforms = platforms.linux;
          };
        });

        # The desktop GUI + system tray.
        teleportfling-gui = pkgs.buildGoModule (buildEnv (streamLibs ++ guiLibs) // {
          pname = "teleportfling-gui";
          version = "0.1.0";
          src = self;
          sourceRoot = self.sourceRoot or null;
          subPackages = [ "cmd/teleportfling-gui" ];
          vendorHash = "sha256-1PDoL45BWhWNVX9wktR3WXpNbXJ+7V4mfp3la+Nv0wI=";

          postInstall = ''
            mkdir -p $out/share/applications
            install -m 0644 ${./assets/teleportfling.desktop} $out/share/applications/teleportfling.desktop
            mkdir -p $out/share/icons/hicolor/512x512/apps
            install -m 0644 ${./assets/teleportfling.png} $out/share/icons/hicolor/512x512/apps/teleportfling.png
          '';

          meta = with pkgs.lib; {
            description = "TeleportFling desktop GUI and system tray";
            homepage = "https://gitea.edley.me/petere/TeleportFling";
            license = licenses.gpl2;
            mainProgram = "teleportfling-gui";
            platforms = platforms.linux;
          };
        });
      in
      {
        packages = {
          default = teleportfling-gui;
          inherit teleportfling teleportfling-gui;
        };

        apps = {
          teleportfling = flake-utils.lib.mkApp { drv = teleportfling; };
          teleportfling-gui = flake-utils.lib.mkApp { drv = teleportfling-gui; };
          default = self.apps.${system}.teleportfling-gui;
        };

        devShells.default = pkgs.mkShell {
          inputsFrom = [];
          nativeBuildInputs = with pkgs; [
            go
            golangci-lint
            pkg-config
            gopls
            nixd
            nodejs
          ];
          buildInputs = with pkgs; [
            git
            direnv
            nix-direnv
          ] ++ streamLibs ++ guiLibs;

          # Make turbojpeg resolve via pkg-config for cgo builds.
          PKG_CONFIG_PATH = "${pkgs.libjpeg_turbo.dev}/lib/pkgconfig";
          LD_LIBRARY_PATH = "${pkgs.libjpeg_turbo.out}/lib";

          # Fyne/GLFW link against X11, Wayland, GL and misc libs. Go's cgo
          # linker does not read NIX_LDFLAGS, so expose the runtime lib dirs
          # via LIBRARY_PATH for the link step.
          LIBRARY_PATH = with pkgs; lib.makeLibraryPath (streamLibs ++ guiLibs);

          # Nix's libspa-0.2.pc emits -fno-strict-aliasing/-fno-strict-overflow
          # which Go's cgo rejects unless explicitly allowed.
          CGO_CFLAGS_ALLOW = cgoFlagsAllow;

          shellHook = ''
            echo "TeleportFling dev shell ready!"
          '';
        };
      });
}