Have GuiPrivate be optionally checked

Author: edo9300

src/frontend/qt_sdl/CMakeLists.txt

@@ -65,8 +65,12 @@ set(SOURCES_QT_SDL
 option(USE_QT6 "Use Qt 6 instead of Qt 5" ON)
 
 if (USE_QT6)
-    find_package(Qt6 COMPONENTS Core Gui GuiPrivate Widgets Network Multimedia OpenGL OpenGLWidgets Svg REQUIRED)
-    set(QT_LINK_LIBS Qt6::Core Qt6::Gui Qt6::GuiPrivate Qt6::Widgets Qt6::Network Qt6::Multimedia Qt6::OpenGL Qt6::OpenGLWidgets)
+    find_package(Qt6 COMPONENTS Core Gui Widgets Network Multimedia OpenGL OpenGLWidgets Svg REQUIRED OPTIONAL_COMPONENTS GuiPrivate)
+    if(TARGET Qt6::GuiPrivate)
+        set(QT_LINK_LIBS Qt6::Core Qt6::Gui Qt6::GuiPrivate Qt6::Widgets Qt6::Network Qt6::Multimedia Qt6::OpenGL Qt6::OpenGLWidgets)
+    else()
+        set(QT_LINK_LIBS Qt6::Core Qt6::Gui Qt6::Widgets Qt6::Network Qt6::Multimedia Qt6::OpenGL Qt6::OpenGLWidgets)
+    endif()
 else()
     find_package(Qt5 COMPONENTS Core Gui Widgets Network Multimedia Svg REQUIRED)
     set(QT_LINK_LIBS Qt5::Core Qt5::Gui Qt5::Widgets Qt5::Network Qt5::Multimedia)