diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..104deeb
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+*.sh text eol=lf
+*.mk text eol=lf
+SConstruct text eol=lf
+*/SConstruct text eol=lf
+bin/M5CardputerZero-AppStore text eol=lf
diff --git a/README.md b/README.md
index faabd89..b739251 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,74 @@ M5APPSTORE_STATE_DIR=/root/.local/share/cardputerzero-appstore
 M5APPSTORE_APP_ROOT=/usr/share/APPLaunch
 ```
 
+## Display runtimes
+
+The default CardputerZero deployment is unchanged: it builds and installs the
+single `M5CardputerZero-AppStore` framebuffer/evdev binary through the existing
+APPLaunch path. Wayland support is an optional dual-runtime deployment; it does
+not replace the default framebuffer runtime.
+
+For an explicit dual-runtime deployment, the stable APPLaunch entry becomes a
+wrapper that selects the display implementation at runtime:
+
+```text
+/usr/share/APPLaunch/bin/M5CardputerZero-AppStore
+  wrapper at the existing launcher path
+/usr/share/APPLaunch/bin/M5CardputerZero-AppStore-wayland
+  SDL/LVGL runtime for labwc/Wayland and X11 sessions
+/usr/share/APPLaunch/bin/M5CardputerZero-AppStore-fbdev
+  direct framebuffer runtime for the legacy launcher
+```
+
+When the optional wrapper is installed, `M5APPSTORE_DISPLAY_BACKEND` selects a
+runtime explicitly. If it is unset, the wrapper uses the Wayland/SDL runtime if
+`WAYLAND_DISPLAY` or `DISPLAY` is present; otherwise it uses the framebuffer
+runtime. This preserves the APPLaunch entry path:
+
+```bash
+M5APPSTORE_DISPLAY_BACKEND=wayland M5CardputerZero-AppStore
+M5APPSTORE_DISPLAY_BACKEND=fbdev M5CardputerZero-AppStore
+```
+
+The wrapper preserves a caller-provided `SDL_VIDEODRIVER`. In a Wayland session
+where it is not already set, it selects SDL's Wayland driver and disables
+libdecor so labwc owns the window decorations. The SDL runtime identifies its
+Wayland window as `cardputerzero-appstore` and creates a fixed 320×170 AppStore
+window.
+
+The normal framebuffer-only device build remains the existing command:
+
+```bash
+CardputerZero=y scons -j8
+```
+
+To make a dual-runtime release, build the two named runtime binaries separately
+(use separate build directories or clean between configurations), then assemble
+the wrapper and both binaries into one release directory:
+
+```bash
+# CardputerZero cross build: primary framebuffer runtime
+CardputerZero=y APPSTORE_DISPLAY_BACKEND=fbdev scons -j8
+
+# Native aarch64 Linux build on the Wayland-capable runtime image: optional runtime
+APPSTORE_DISPLAY_BACKEND=wayland scons -j8
+```
+
+Install the dual-runtime release only when all three files are present:
+
+```bash
+install -m 755 M5CardputerZero-AppStore /usr/share/APPLaunch/bin/M5CardputerZero-AppStore
+install -m 755 M5CardputerZero-AppStore-fbdev /usr/share/APPLaunch/bin/M5CardputerZero-AppStore-fbdev
+install -m 755 M5CardputerZero-AppStore-wayland /usr/share/APPLaunch/bin/M5CardputerZero-AppStore-wayland
+```
+
+The framebuffer build deliberately remains the primary cross-compilation
+profile. The Wayland build is native because it links against the runtime
+image's SDL2/Wayland libraries; requesting it with `CardputerZero=y` fails
+early instead of producing an incompatible binary. The stock `setup.ini`
+continues to deploy the framebuffer-only artifact; dual-runtime release
+assembly and installation are an explicit opt-in.
+
 Default registry:
 
 ```text
diff --git a/SConstruct b/SConstruct
index d8c7545..07c376f 100644
--- a/SConstruct
+++ b/SConstruct
@@ -21,8 +21,54 @@ version_file = local_path.parent.parent / "ext_components" / "cp0_lvgl" / "sdk_v
 version = version_file.read_text(encoding="utf-8")
 static_lib_path = sdk_path / "github_source" / f"static_lib_{version}"
 
+def requested_display_backend():
+    value = (
+        os.environ.get("APPSTORE_DISPLAY_BACKEND") or
+        os.environ.get("M5APPSTORE_DISPLAY_BACKEND") or
+        "auto"
+    ).strip().lower()
+    aliases = {
+        "": "auto",
+        "auto": "auto",
+        "fb": "fbdev",
+        "fbdev": "fbdev",
+        "framebuffer": "fbdev",
+        "direct-fb": "fbdev",
+        "device": "fbdev",
+        "sdl": "wayland",
+        "wayland": "wayland",
+        "labwc": "wayland",
+        "x11": "wayland",
+        "window": "wayland",
+    }
+    if value not in aliases:
+        raise RuntimeError(
+            "Unsupported APPSTORE_DISPLAY_BACKEND={!r}. "
+            "Use auto, fbdev, sdl, wayland, labwc, or x11.".format(value)
+        )
+    return aliases[value]
+
+
+display_backend = requested_display_backend()
 if os.environ.get("CardputerZero", '') == 'y':
+    if display_backend == "wayland":
+        raise RuntimeError(
+            "APPSTORE_DISPLAY_BACKEND=wayland is a native Linux build. "
+            "The CardputerZero cross build remains the fbdev runtime."
+        )
     os.environ["CONFIG_DEFAULT_FILE"] = "linux_x86_cross_cp0_config_defaults.mk"
+    if display_backend == "fbdev":
+        os.environ["APPSTORE_RUNTIME_BINARY"] = "M5CardputerZero-AppStore-fbdev"
+elif display_backend == "wayland":
+    os.environ["CONFIG_DEFAULT_FILE"] = "linux_x86_sdl2_config_defaults.mk"
+    os.environ["APPSTORE_RUNTIME_BINARY"] = "M5CardputerZero-AppStore-wayland"
+elif display_backend == "fbdev":
+    if os.environ.get("CONFIG_DEFAULT_FILE") is None:
+        raise RuntimeError(
+            "APPSTORE_DISPLAY_BACKEND=fbdev requires CardputerZero=y for the "
+            "cross profile, or an explicit framebuffer CONFIG_DEFAULT_FILE."
+        )
+    os.environ["APPSTORE_RUNTIME_BINARY"] = "M5CardputerZero-AppStore-fbdev"
 
 if os.environ.get("CONFIG_DEFAULT_FILE") == None:
     if platform.machine() == 'x86_64':
diff --git a/bin/M5CardputerZero-AppStore b/bin/M5CardputerZero-AppStore
new file mode 100755
index 0000000..18aba93
--- /dev/null
+++ b/bin/M5CardputerZero-AppStore
@@ -0,0 +1,58 @@
+#!/bin/sh
+# SPDX-License-Identifier: MIT
+
+set -eu
+
+case "$0" in
+    */*) app_dir=${0%/*} ;;
+    *) app_dir=/usr/share/APPLaunch/bin ;;
+esac
+
+backend=${M5APPSTORE_DISPLAY_BACKEND:-${APPSTORE_DISPLAY_BACKEND:-auto}}
+
+case "$backend" in
+    auto|"")
+        if [ -n "${WAYLAND_DISPLAY:-}" ] || [ -n "${DISPLAY:-}" ]; then
+            backend=wayland
+        else
+            backend=fbdev
+        fi
+        ;;
+    wayland|labwc|sdl|x11|window)
+        backend=wayland
+        ;;
+    fb|fbdev|framebuffer|direct-fb|device)
+        backend=fbdev
+        ;;
+    *)
+        echo "M5CardputerZero-AppStore: unsupported M5APPSTORE_DISPLAY_BACKEND=$backend" >&2
+        exit 2
+        ;;
+esac
+
+if [ "$backend" = "wayland" ]; then
+    binary=$app_dir/M5CardputerZero-AppStore-wayland
+    if [ ! -x "$binary" ]; then
+        echo "M5CardputerZero-AppStore: Wayland/SDL runtime is not installed: $binary" >&2
+        exit 127
+    fi
+    if [ -n "${WAYLAND_DISPLAY:-}" ] && [ -z "${SDL_VIDEODRIVER:-}" ]; then
+        export SDL_VIDEODRIVER=wayland
+    fi
+    export SDL_VIDEO_WAYLAND_ALLOW_LIBDECOR=0
+    export SDL_VIDEO_WAYLAND_PREFER_LIBDECOR=0
+    exec "$binary" "$@"
+fi
+
+binary=$app_dir/M5CardputerZero-AppStore-fbdev
+if [ ! -x "$binary" ]; then
+    legacy=$app_dir/M5CardputerZero-AppStore.bin
+    if [ -x "$legacy" ]; then
+        binary=$legacy
+    else
+        echo "M5CardputerZero-AppStore: framebuffer runtime is not installed: $binary" >&2
+        exit 127
+    fi
+fi
+
+exec "$binary" "$@"
diff --git a/main/SConstruct b/main/SConstruct
index 3f2416c..e50c369 100644
--- a/main/SConstruct
+++ b/main/SConstruct
@@ -37,6 +37,8 @@ APPSTORE_STATIC_ROOT = os.path.join(PROJECT_ROOT, "APPLaunch")
 APPLAUNCH_STATIC_ROOT = os.path.abspath(os.path.join(PROJECT_ROOT, "..", "APPLaunch", "APPLaunch"))
 STAGED_STATIC_ROOT = os.path.abspath(os.path.join("build", "static"))
 STAGED_APPLAUNCH = os.path.join(STAGED_STATIC_ROOT, "APPLaunch")
+RUNTIME_BINARY = os.environ.get("APPSTORE_RUNTIME_BINARY", "M5CardputerZero-AppStore")
+RUNTIME_WRAPPER = os.path.join(PROJECT_ROOT, "bin", "M5CardputerZero-AppStore")
 
 
 def stage_appstore_static_files():
@@ -65,6 +67,8 @@ def stage_appstore_static_files():
 
 stage_appstore_static_files()
 STATIC_FILES += [(STAGED_APPLAUNCH, "APPLaunch")]
+if RUNTIME_BINARY != "M5CardputerZero-AppStore":
+    STATIC_FILES += [(RUNTIME_WRAPPER, "M5CardputerZero-AppStore")]
 
 def pkg_config_flags(kind, package):
     try:
@@ -108,6 +112,8 @@ if FREETYPE_INCLUDE:
 if "CONFIG_V9_5_LV_USE_FREETYPE" in os.environ:
     REQUIREMENTS += ["freetype"]
 if "CONFIG_V9_5_LV_USE_SDL" in os.environ:
+    REQUIREMENTS += ["SDL2"]
+    INCLUDE += ["/usr/include/SDL2"]
     lvgl_component["REQUIREMENTS"] += ["SDL2"]
     lvgl_component["INCLUDE"] += ["/usr/include/SDL2"]
     for sdl_include in [
@@ -117,6 +123,7 @@ if "CONFIG_V9_5_LV_USE_SDL" in os.environ:
         "/usr/local/include/SDL2",
     ]:
         if os.path.exists(sdl_include):
+            INCLUDE += [sdl_include]
             lvgl_component["INCLUDE"] += [sdl_include]
     for sdl_lib in ["/opt/homebrew/lib", "/usr/local/lib"]:
         if os.path.exists(sdl_lib):
@@ -130,7 +137,7 @@ if "CONFIG_V9_5_LV_USE_SDL" in os.environ:
 
 env["COMPONENTS"].append(
     {
-        "target": "M5CardputerZero-AppStore",
+        "target": RUNTIME_BINARY,
         "SRCS": SRCS,
         "INCLUDE": INCLUDE,
         "PRIVATE_INCLUDE": PRIVATE_INCLUDE,
diff --git a/main/src/main.cpp b/main/src/main.cpp
index 9cabe35..cfff2ed 100644
--- a/main/src/main.cpp
+++ b/main/src/main.cpp
@@ -7,6 +7,7 @@
 #include "hal/hal_paths.h"
 #endif
 
+#include <cstdlib>
 #include <string>
 
 namespace {
@@ -20,6 +21,17 @@ std::string executable_dir(const char *path)
     return slash == 0 ? "/" : value.substr(0, slash);
 }
 
+#ifdef CONFIG_V9_5_LV_USE_SDL
+void configure_sdl_runtime()
+{
+    // These must be configured before cp0_lvgl_run_app() initializes SDL.
+    setenv("SDL_VIDEO_WAYLAND_ALLOW_LIBDECOR", "0", 0);
+    setenv("SDL_VIDEO_WAYLAND_PREFER_LIBDECOR", "0", 0);
+    setenv("SDL_VIDEO_WAYLAND_WMCLASS", "cardputerzero-appstore", 0);
+    setenv("SDL_VIDEO_X11_WMCLASS", "cardputerzero-appstore", 0);
+}
+#endif
+
 } // namespace
 
 int main(int argc, char **argv)
@@ -29,6 +41,7 @@ int main(int argc, char **argv)
     if (appstore::run_backend_process_mode(argc, argv, &backend_exit_code))
         return backend_exit_code;
 #ifdef CONFIG_V9_5_LV_USE_SDL
+    configure_sdl_runtime();
     const std::string directory = executable_dir(argv && argv[0] ? argv[0] : nullptr);
     hal_paths_init(directory.c_str());
 #endif
diff --git a/main/ui/appstore.cpp b/main/ui/appstore.cpp
index 4329eb0..abb2f84 100644
--- a/main/ui/appstore.cpp
+++ b/main/ui/appstore.cpp
@@ -12,6 +12,11 @@
 #include "cp0_lvgl_app_runner.hpp"
 #include "hal_lvgl_bsp.h"
 
+#ifdef CONFIG_V9_5_LV_USE_SDL
+#include <SDL.h>
+#include "lvgl/src/drivers/sdl/lv_sdl_window.h"
+#endif
+
 #include <cstdarg>
 #include <csignal>
 #include <cstdio>
@@ -111,6 +116,22 @@ void handle_signal(int)
     request_quit();
 }
 
+#ifdef CONFIG_V9_5_LV_USE_SDL
+void configure_sdl_window()
+{
+    lv_display_t *display = lv_display_get_default();
+    SDL_Window *window = display ? lv_sdl_window_get_window(display) : nullptr;
+    if (!window) return;
+    SDL_HideWindow(window);
+    SDL_SetWindowTitle(window, "AppStore");
+    SDL_SetWindowBordered(window, SDL_FALSE);
+    SDL_SetWindowResizable(window, SDL_FALSE);
+    SDL_SetWindowMinimumSize(window, kScreenWidth, kScreenHeight);
+    SDL_SetWindowSize(window, kScreenWidth, kScreenHeight);
+    SDL_ShowWindow(window);
+}
+#endif
+
 class AppStoreSyncTopBarComponent final : public AppTopBarComponent
 {
 public:
@@ -588,6 +609,9 @@ void ui_init(int argc, char **argv)
     std::signal(SIGINT, handle_signal);
     std::signal(SIGTERM, handle_signal);
     cp0_zmq_log_init();
+#ifdef CONFIG_V9_5_LV_USE_SDL
+    configure_sdl_window();
+#endif
     if (auto *app = appstore_ui::AppStoreApp::current())
         app->lifecycle().initialize(argc, argv);
 }
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 7816982..e153627 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -3,6 +3,8 @@ set -eu
 build_dir="${TMPDIR:-/tmp}/appstore-tests"
 mkdir -p "$build_dir"
 "$(dirname "$0")/test_backend_boundaries.sh"
+"$(dirname "$0")/test_runtime_deployment.sh"
+"$(dirname "$0")/test_runtime_launcher.sh"
 ${CXX:-g++} -std=c++17 -Wall -Wextra -Werror \
     -I"$(dirname "$0")/../main/include" -I"$(dirname "$0")/../main/interface" -I"$(dirname "$0")/../main/ui" \
     "$(dirname "$0")/test_appstore_paths.cpp" \
diff --git a/tests/test_runtime_deployment.sh b/tests/test_runtime_deployment.sh
new file mode 100755
index 0000000..0a8d03e
--- /dev/null
+++ b/tests/test_runtime_deployment.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+set -eu
+
+project_dir=$(CDPATH= cd -- "$(dirname "$0")/.." && pwd)
+setup_ini="$project_dir/setup.ini"
+after_cmd=$(sed -n 's/^after_cmd = //p' "$setup_ini")
+
+case "$after_cmd" in
+    *M5CardputerZero-AppStore-wayland*|*M5CardputerZero-AppStore-fbdev*)
+        echo "default setup.ini deployment must remain framebuffer-only" >&2
+        exit 1
+        ;;
+esac
+
+printf '%s\n' "$after_cmd" |
+    grep -F 'install -m 755 /home/pi/dist/M5CardputerZero-AppStore /usr/share/APPLaunch/bin/M5CardputerZero-AppStore' \
+    >/dev/null
+
+echo "default framebuffer deployment test passed"
diff --git a/tests/test_runtime_launcher.sh b/tests/test_runtime_launcher.sh
new file mode 100755
index 0000000..e4f2993
--- /dev/null
+++ b/tests/test_runtime_launcher.sh
@@ -0,0 +1,58 @@
+#!/bin/sh
+set -eu
+
+project_dir=$(CDPATH= cd -- "$(dirname "$0")/.." && pwd)
+launcher="$project_dir/bin/M5CardputerZero-AppStore"
+test_dir=$(mktemp -d "${TMPDIR:-/tmp}/appstore-launcher.XXXXXX")
+trap 'rm -rf "$test_dir"' EXIT HUP INT TERM
+
+make_runtime() {
+    path=$1
+    printf '%s\n' '#!/bin/sh' \
+        'printf "%s|%s|%s|%s\\n" "$0" "${SDL_VIDEODRIVER:-}" "${SDL_VIDEO_WAYLAND_ALLOW_LIBDECOR:-}" "${SDL_VIDEO_WAYLAND_PREFER_LIBDECOR:-}"' \
+        > "$path"
+    chmod +x "$path"
+}
+
+wayland="$test_dir/M5CardputerZero-AppStore-wayland"
+fbdev="$test_dir/M5CardputerZero-AppStore-fbdev"
+legacy="$test_dir/M5CardputerZero-AppStore.bin"
+test_launcher="$test_dir/M5CardputerZero-AppStore"
+cp "$launcher" "$test_launcher"
+chmod +x "$test_launcher"
+make_runtime "$wayland"
+make_runtime "$fbdev"
+
+expected="$wayland|wayland|0|0"
+actual=$(env -i PATH="$PATH" WAYLAND_DISPLAY=wayland-0 "$test_launcher")
+[ "$actual" = "$expected" ]
+
+expected="$fbdev|||"
+actual=$(env -i PATH="$PATH" "$test_launcher")
+[ "$actual" = "$expected" ]
+
+expected="$wayland|||"
+actual=$(env -i PATH="$PATH" DISPLAY=:0 "$test_launcher")
+[ "$actual" = "$expected" ]
+
+expected="$fbdev|||"
+actual=$(env -i PATH="$PATH" WAYLAND_DISPLAY=wayland-0 M5APPSTORE_DISPLAY_BACKEND=fbdev "$test_launcher")
+[ "$actual" = "$expected" ]
+
+expected="$wayland|x11|0|0"
+actual=$(env -i PATH="$PATH" WAYLAND_DISPLAY=wayland-0 SDL_VIDEODRIVER=x11 "$test_launcher")
+[ "$actual" = "$expected" ]
+
+rm "$fbdev"
+make_runtime "$legacy"
+expected="$legacy|||"
+actual=$(env -i PATH="$PATH" "$test_launcher")
+[ "$actual" = "$expected" ]
+
+if env -i PATH="$PATH" M5APPSTORE_DISPLAY_BACKEND=unknown "$test_launcher" >"$test_dir/error" 2>&1; then
+    echo "launcher accepted an invalid display backend" >&2
+    exit 1
+fi
+grep -F 'unsupported M5APPSTORE_DISPLAY_BACKEND=unknown' "$test_dir/error" >/dev/null
+
+echo "runtime launcher tests passed"