diff --git a/autotests/integration/CMakeLists.txt b/autotests/integration/CMakeLists.txt
index e32cba0c8d..b195e4ed3a 100644
--- a/autotests/integration/CMakeLists.txt
+++ b/autotests/integration/CMakeLists.txt
@@ -2,12 +2,17 @@ add_subdirectory(helper)
 
 add_library(KWinIntegrationTestFramework STATIC)
 
+if (Qt6_VERSION VERSION_GREATER_EQUAL "6.8.0")
+    set(private_code_option  "PRIVATE_CODE")
+endif()
 qt6_generate_wayland_protocol_client_sources(KWinIntegrationTestFramework
+    ${private_code_option}
     NO_INCLUDE_CORE_ONLY
     FILES
         ${WaylandProtocols_DATADIR}/unstable/input-method/input-method-unstable-v1.xml
 )
 qt6_generate_wayland_protocol_client_sources(KWinIntegrationTestFramework
+    ${private_code_option}
     FILES
         ${WaylandProtocols_DATADIR}/unstable/text-input/text-input-unstable-v3.xml
         ${CMAKE_SOURCE_DIR}/src/wayland/protocols/wlr-layer-shell-unstable-v1.xml
diff --git a/autotests/wayland/client/CMakeLists.txt b/autotests/wayland/client/CMakeLists.txt
index a93aadc59d..ce70aecccc 100644
--- a/autotests/wayland/client/CMakeLists.txt
+++ b/autotests/wayland/client/CMakeLists.txt
@@ -1,3 +1,6 @@
+if (Qt6_VERSION VERSION_GREATER_EQUAL "6.8.0")
+    set(private_code_option  "PRIVATE_CODE")
+endif()
 ########################################################
 # Test WaylandOutput
 ########################################################
@@ -29,8 +32,11 @@ add_executable(testWaylandSeat)
 set( testWaylandSeat_SRCS
         test_wayland_seat.cpp
     )
-qt6_generate_wayland_protocol_client_sources(testWaylandSeat FILES
-    ${WaylandProtocols_DATADIR}/unstable/pointer-gestures/pointer-gestures-unstable-v1.xml)
+qt6_generate_wayland_protocol_client_sources(testWaylandSeat 
+    ${private_code_option}
+    FILES
+        ${WaylandProtocols_DATADIR}/unstable/pointer-gestures/pointer-gestures-unstable-v1.xml
+)
 target_sources(testWaylandSeat PRIVATE ${testWaylandSeat_SRCS})
 target_link_libraries( testWaylandSeat Qt::Test Qt::Gui Plasma::KWaylandClient kwin Wayland::Client Wayland::Server)
 add_test(NAME kwayland-testWaylandSeat COMMAND testWaylandSeat)
@@ -131,8 +137,11 @@ set( testServerSideDecoration_SRCS
         test_server_side_decoration.cpp
     )
 add_executable(testServerSideDecoration ${testServerSideDecoration_SRCS})
-qt6_generate_wayland_protocol_client_sources(testServerSideDecoration FILES
-    ${PLASMA_WAYLAND_PROTOCOLS_DIR}/server-decoration.xml)
+qt6_generate_wayland_protocol_client_sources(testServerSideDecoration 
+    ${private_code_option}
+    FILES
+        ${PLASMA_WAYLAND_PROTOCOLS_DIR}/server-decoration.xml
+)
 target_link_libraries( testServerSideDecoration Qt::Test Qt::Gui Plasma::KWaylandClient kwin Wayland::Client)
 add_test(NAME kwayland-testServerSideDecoration COMMAND testServerSideDecoration)
 ecm_mark_as_test(testServerSideDecoration)
@@ -264,8 +273,11 @@ set( testServerSideDecorationPalette_SRCS
         test_server_side_decoration_palette.cpp
     )
 add_executable(testServerSideDecorationPalette ${testServerSideDecorationPalette_SRCS})
-qt6_generate_wayland_protocol_client_sources(testServerSideDecorationPalette FILES
-    ${PLASMA_WAYLAND_PROTOCOLS_DIR}/server-decoration-palette.xml)
+qt6_generate_wayland_protocol_client_sources(testServerSideDecorationPalette
+    ${private_code_option}
+    FILES
+        ${PLASMA_WAYLAND_PROTOCOLS_DIR}/server-decoration-palette.xml
+)
 target_link_libraries( testServerSideDecorationPalette Qt::Test Qt::Gui Plasma::KWaylandClient Wayland::Client kwin)
 add_test(NAME kwayland-testServerSideDecorationPalette COMMAND testServerSideDecorationPalette)
 ecm_mark_as_test(testServerSideDecorationPalette)
diff --git a/autotests/wayland/server/CMakeLists.txt b/autotests/wayland/server/CMakeLists.txt
index 26adf2ae19..4f6ecab352 100644
--- a/autotests/wayland/server/CMakeLists.txt
+++ b/autotests/wayland/server/CMakeLists.txt
@@ -1,3 +1,6 @@
+if (Qt6_VERSION VERSION_GREATER_EQUAL "6.8.0")
+    set(private_code_option  "PRIVATE_CODE")
+endif()
 ########################################################
 # Test WaylandServerDisplay
 ########################################################
@@ -32,8 +35,11 @@ ecm_mark_as_test(testNoXdgRuntimeDir)
 # Test Tablet Interface
 ########################################################
 add_executable(testTabletInterface)
-qt6_generate_wayland_protocol_client_sources(testTabletInterface FILES
-    ${WaylandProtocols_DATADIR}/unstable/tablet/tablet-unstable-v2.xml)
+qt6_generate_wayland_protocol_client_sources(testTabletInterface 
+    ${private_code_option}
+    FILES
+        ${WaylandProtocols_DATADIR}/unstable/tablet/tablet-unstable-v2.xml
+    )
 target_sources(testTabletInterface PRIVATE test_tablet_interface.cpp ${TABLET_SRCS})
 target_link_libraries( testTabletInterface Qt::Test kwin Plasma::KWaylandClient Wayland::Client)
 add_test(NAME kwayland-testTabletInterface COMMAND testTabletInterface)
@@ -43,8 +49,11 @@ ecm_mark_as_test(testTabletInterface)
 # Test DataControlInterface
 ########################################################
 add_executable(testDataControlInterface test_datacontrol_interface.cpp ${DATACONTROL_SRCS})
-qt6_generate_wayland_protocol_client_sources(testDataControlInterface FILES
-    ${PROJECT_SOURCE_DIR}/src/wayland/protocols/wlr-data-control-unstable-v1.xml)
+qt6_generate_wayland_protocol_client_sources(testDataControlInterface
+    ${private_code_option}
+    FILES
+        ${PROJECT_SOURCE_DIR}/src/wayland/protocols/wlr-data-control-unstable-v1.xml
+)
 target_sources(testDataControlInterface PRIVATE test_datacontrol_interface.cpp ${DATACONTROL_SRCS})
 target_link_libraries( testDataControlInterface Qt::Test kwin Plasma::KWaylandClient Wayland::Client)
 add_test(NAME kwayland-testDataControlInterface COMMAND testDataControlInterface)
@@ -54,8 +63,11 @@ ecm_mark_as_test(testDataControlInterface)
 # Test Keyboard Shortcuts Inhibitor Interface
 ########################################################
 add_executable(testKeyboardShortcutsInhibitorInterface)
-qt6_generate_wayland_protocol_client_sources(testKeyboardShortcutsInhibitorInterface FILES
-    ${WaylandProtocols_DATADIR}/unstable/keyboard-shortcuts-inhibit/keyboard-shortcuts-inhibit-unstable-v1.xml)
+qt6_generate_wayland_protocol_client_sources(testKeyboardShortcutsInhibitorInterface
+    ${private_code_option}
+    FILES
+        ${WaylandProtocols_DATADIR}/unstable/keyboard-shortcuts-inhibit/keyboard-shortcuts-inhibit-unstable-v1.xml
+)
 target_sources(testKeyboardShortcutsInhibitorInterface PRIVATE test_keyboard_shortcuts_inhibitor_interface.cpp ${KEYBOARD_SHORTCUTS_INHIBITOR_SRCS})
 target_link_libraries(testKeyboardShortcutsInhibitorInterface Qt::Test kwin Plasma::KWaylandClient Wayland::Client)
 add_test(NAME kwayland-testKeyboardShortcutsInhibitorInterface COMMAND testKeyboardShortcutsInhibitorInterface)
@@ -65,8 +77,11 @@ ecm_mark_as_test(testKeyboardShortcutsInhibitorInterface)
 # Test Viewporter Interface
 ########################################################
 add_executable(testViewporterInterface)
-qt6_generate_wayland_protocol_client_sources(testViewporterInterface FILES
-    ${WaylandProtocols_DATADIR}/stable/viewporter/viewporter.xml)
+qt6_generate_wayland_protocol_client_sources(testViewporterInterface
+    ${private_code_option}
+    FILES
+        ${WaylandProtocols_DATADIR}/stable/viewporter/viewporter.xml
+)
 target_sources(testViewporterInterface PRIVATE test_viewporter_interface.cpp ${VIEWPORTER_SRCS})
 target_link_libraries(testViewporterInterface Qt::Test kwin Plasma::KWaylandClient Wayland::Client)
 add_test(NAME kwayland-testViewporterInterface COMMAND testViewporterInterface)
@@ -76,8 +91,11 @@ ecm_mark_as_test(testViewporterInterface)
 # Test ScreencastV1Interface
 ########################################################
 add_executable(testScreencastV1Interface)
-qt6_generate_wayland_protocol_client_sources(testScreencastV1Interface FILES
-    ${PLASMA_WAYLAND_PROTOCOLS_DIR}/zkde-screencast-unstable-v1.xml)
+qt6_generate_wayland_protocol_client_sources(testScreencastV1Interface
+    ${private_code_option}
+    FILES
+        ${PLASMA_WAYLAND_PROTOCOLS_DIR}/zkde-screencast-unstable-v1.xml
+)
 target_sources(testScreencastV1Interface PRIVATE test_screencast.cpp ${SCREENCAST_SRCS})
 target_link_libraries(testScreencastV1Interface Qt::Test kwin Wayland::Client Plasma::KWaylandClient)
 add_test(NAME kwayland-testScreencastV1Interface COMMAND testScreencastV1Interface)
@@ -91,6 +109,7 @@ qt6_generate_wayland_protocol_client_sources(testInputMethodInterface
     NO_INCLUDE_CORE_ONLY
     FILES
         ${WaylandProtocols_DATADIR}/unstable/input-method/input-method-unstable-v1.xml
+    ${private_code_option}
 )
 target_sources(testInputMethodInterface PRIVATE
     test_inputmethod_interface.cpp
@@ -105,9 +124,11 @@ ecm_mark_as_test(testInputMethodInterface)
 # Test LayerShellV1 Interface
 ########################################################
 add_executable(testLayerShellV1Interface)
-qt6_generate_wayland_protocol_client_sources(testLayerShellV1Interface FILES
-    ${PROJECT_SOURCE_DIR}/src/wayland/protocols/wlr-layer-shell-unstable-v1.xml
-    ${WaylandProtocols_DATADIR}/stable/xdg-shell/xdg-shell.xml
+qt6_generate_wayland_protocol_client_sources(testLayerShellV1Interface
+    ${private_code_option}
+    FILES
+        ${PROJECT_SOURCE_DIR}/src/wayland/protocols/wlr-layer-shell-unstable-v1.xml
+        ${WaylandProtocols_DATADIR}/stable/xdg-shell/xdg-shell.xml
 )
 target_sources(testLayerShellV1Interface PRIVATE test_layershellv1_interface.cpp ${LAYERSHELLV1_SRCS})
 target_link_libraries(testLayerShellV1Interface Qt::Test kwin Plasma::KWaylandClient Wayland::Client)
@@ -119,8 +140,11 @@ ecm_mark_as_test(testLayerShellV1Interface)
 # Test TextInputV3 Interface
 ########################################################
 add_executable(testTextInputV3Interface)
-qt6_generate_wayland_protocol_client_sources(testTextInputV3Interface FILES
-    ${WaylandProtocols_DATADIR}/unstable/text-input/text-input-unstable-v3.xml)
+qt6_generate_wayland_protocol_client_sources(testTextInputV3Interface 
+    ${private_code_option}
+    FILES
+        ${WaylandProtocols_DATADIR}/unstable/text-input/text-input-unstable-v3.xml
+)
 target_sources(testTextInputV3Interface PRIVATE test_textinputv3_interface.cpp ${TEXTINPUTV3_SRCS})
 target_link_libraries(testTextInputV3Interface Qt::Test kwin Plasma::KWaylandClient Wayland::Client)
 add_test(NAME kwayland-testTextInputV3Interface COMMAND testTextInputV3Interface)
@@ -130,8 +154,11 @@ ecm_mark_as_test(testTextInputV3Interface)
 # Test TextInputV1 Interface
 ########################################################
 add_executable(testTextInputV1Interface)
-qt6_generate_wayland_protocol_client_sources(testTextInputV1Interface FILES
-    ${WaylandProtocols_DATADIR}/unstable/text-input/text-input-unstable-v1.xml)
+qt6_generate_wayland_protocol_client_sources(testTextInputV1Interface
+    ${private_code_option}
+    FILES
+        ${WaylandProtocols_DATADIR}/unstable/text-input/text-input-unstable-v1.xml
+)
 target_sources(testTextInputV1Interface PRIVATE test_textinputv1_interface.cpp ${TEXTINPUTV1_SRCS})
 target_link_libraries(testTextInputV1Interface Qt::Test kwin Plasma::KWaylandClient Wayland::Client)
 add_test(NAME kwayland-testTextInputV1Interface COMMAND testTextInputV1Interface)
diff --git a/src/helpers/killer/CMakeLists.txt b/src/helpers/killer/CMakeLists.txt
index 168bb09799..8dc6f4acf4 100644
--- a/src/helpers/killer/CMakeLists.txt
+++ b/src/helpers/killer/CMakeLists.txt
@@ -4,7 +4,14 @@ set(kwin_killer_helper_SRCS killer.cpp)
 
 add_executable(kwin_killer_helper ${kwin_killer_helper_SRCS})
 
-qt6_generate_wayland_protocol_client_sources(kwin_killer_helper FILES ${WaylandProtocols_DATADIR}/unstable/xdg-foreign/xdg-foreign-unstable-v2.xml)
+if (Qt6_VERSION VERSION_GREATER_EQUAL "6.8.0")
+    set(private_code_option  "PRIVATE_CODE")
+endif()
+qt6_generate_wayland_protocol_client_sources(kwin_killer_helper
+    ${private_code_option}
+    FILES
+        ${WaylandProtocols_DATADIR}/unstable/xdg-foreign/xdg-foreign-unstable-v2.xml
+)
 
 target_link_libraries(kwin_killer_helper
     KF6::AuthCore