diff --git a/include/FramelessHelper/Core/framelesshelpercore_global.h b/include/FramelessHelper/Core/framelesshelpercore_global.h
index f772f55..dcb8363 100644
--- a/include/FramelessHelper/Core/framelesshelpercore_global.h
+++ b/include/FramelessHelper/Core/framelesshelpercore_global.h
@@ -108,7 +108,7 @@ QT_END_NAMESPACE
 #endif
 
 #if (QT_VERSION >= QT_VERSION_CHECK(6, 4, 0))
-  using namespace Qt::Literals::StringLiterals;
+  using namespace Qt::StringLiterals;
 #endif
 
 #ifndef FRAMELESSHELPER_BYTEARRAY_LITERAL
diff --git a/include/FramelessHelper/Core/utils.h b/include/FramelessHelper/Core/utils.h
index 5620a43..0aa71ea 100644
--- a/include/FramelessHelper/Core/utils.h
+++ b/include/FramelessHelper/Core/utils.h
@@ -68,6 +68,7 @@ FRAMELESSHELPER_CORE_API void moveWindowToDesktopCenter(
 [[nodiscard]] FRAMELESSHELPER_CORE_API QString getWallpaperFilePath();
 [[nodiscard]] FRAMELESSHELPER_CORE_API Global::WallpaperAspectStyle getWallpaperAspectStyle();
 [[nodiscard]] FRAMELESSHELPER_CORE_API bool isBlurBehindWindowSupported();
+FRAMELESSHELPER_CORE_API void registerThemeChangeNotification();
 
 #ifdef Q_OS_WINDOWS
 [[nodiscard]] FRAMELESSHELPER_CORE_API bool isWindowsVersionOrGreater(const Global::WindowsVersion version);
@@ -121,7 +122,6 @@ FRAMELESSHELPER_CORE_API void setQtDarkModeAwareEnabled(const bool enable, const
 #ifdef Q_OS_LINUX
 [[nodiscard]] FRAMELESSHELPER_CORE_API bool shouldAppsUseDarkMode_linux();
 [[nodiscard]] FRAMELESSHELPER_CORE_API QColor getWmThemeColor();
-FRAMELESSHELPER_CORE_API void registerThemeChangeNotification();
 #endif // Q_OS_LINUX
 
 #ifdef Q_OS_MACOS
diff --git a/src/core/framelesshelpercore_global.cpp b/src/core/framelesshelpercore_global.cpp
index 3b528aa..6f6f063 100644
--- a/src/core/framelesshelpercore_global.cpp
+++ b/src/core/framelesshelpercore_global.cpp
@@ -66,16 +66,6 @@
 #  endif
 #endif
 
-#ifdef Q_OS_LINUX
-static constexpr const char QT_QPA_ENV_VAR[] = "QT_QPA_PLATFORM";
-FRAMELESSHELPER_BYTEARRAY_CONSTANT(xcb)
-#endif
-
-#ifdef Q_OS_MACOS
-static constexpr const char MAC_LAYER_ENV_VAR[] = "QT_MAC_WANTS_LAYER";
-FRAMELESSHELPER_BYTEARRAY_CONSTANT2(ValueOne, "1")
-#endif
-
 FRAMELESSHELPER_BEGIN_NAMESPACE
 
 Q_LOGGING_CATEGORY(lcCoreGlobal, "wangwenx190.framelesshelper.core.global")
@@ -86,6 +76,15 @@ Q_LOGGING_CATEGORY(lcCoreGlobal, "wangwenx190.framelesshelper.core.global")
 
 using namespace Global;
 
+#ifdef Q_OS_LINUX
+[[maybe_unused]] static constexpr const char QT_QPA_ENV_VAR[] = "QT_QPA_PLATFORM";
+FRAMELESSHELPER_BYTEARRAY_CONSTANT(xcb)
+#endif
+
+#ifdef Q_OS_MACOS
+[[maybe_unused]] static constexpr const char MAC_LAYER_ENV_VAR[] = "QT_MAC_WANTS_LAYER";
+#endif
+
 struct CoreData
 {
     QMutex mutex;
@@ -115,10 +114,8 @@ void initialize()
     qputenv(QT_QPA_ENV_VAR, kxcb);
 #endif
 
-#ifdef Q_OS_MACOS
-    // This has become the default setting since some unknown Qt version,
-    // check whether we can remove this hack safely or not.
-    qputenv(MAC_LAYER_ENV_VAR, kValueOne);
+#if (defined(Q_OS_MACOS) && (QT_VERSION < QT_VERSION_CHECK(6, 0, 0)))
+    qputenv(MAC_LAYER_ENV_VAR, FRAMELESSHELPER_BYTEARRAY_LITERAL("1"));
 #endif
 
 #ifdef Q_OS_WINDOWS
@@ -276,9 +273,6 @@ void registerUninitializeHook(const UninitializeHookCallback &cb)
 
 void setApplicationOSThemeAware(const bool enable, const bool pureQuick)
 {
-    Q_UNUSED(enable);
-    Q_UNUSED(pureQuick);
-
     static bool set = false;
     if (set) {
         return;
@@ -287,9 +281,13 @@ void setApplicationOSThemeAware(const bool enable, const bool pureQuick)
 
 #if (defined(Q_OS_WINDOWS) && (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)))
     Utils::setQtDarkModeAwareEnabled(enable, pureQuick);
+#else
+    Q_UNUSED(enable);
+    Q_UNUSED(pureQuick);
 #endif
 
-#if (defined(Q_OS_LINUX) && (QT_VERSION < QT_VERSION_CHECK(6, 4, 0)))
+#if ((defined(Q_OS_LINUX) && (QT_VERSION < QT_VERSION_CHECK(6, 4, 0))) || \
+    (defined(Q_OS_MACOS) && (QT_VERSION < QT_VERSION_CHECK(5, 12, 0))))
     Utils::registerThemeChangeNotification();
 #endif
 }
diff --git a/src/core/utils.cpp b/src/core/utils.cpp
index 67e566e..97e2414 100644
--- a/src/core/utils.cpp
+++ b/src/core/utils.cpp
@@ -219,7 +219,7 @@ bool Utils::isThemeChangeEvent(const QEvent * const event)
     if (!event) {
         return false;
     }
-    // QGuiApplication will only deliver theme change events to top level QWindow(QQuickWindow)s,
+    // QGuiApplication will only deliver theme change events to top level Q(Quick)Windows,
     // QWidgets won't get such notifications, no matter whether it's top level widget or not.
     // QEvent::ThemeChange: Send by the Windows QPA.
     // QEvent::ApplicationPaletteChange: All other platforms (Linux & macOS).
diff --git a/src/core/utils_mac.mm b/src/core/utils_mac.mm
index 3279f02..1b174b6 100644
--- a/src/core/utils_mac.mm
+++ b/src/core/utils_mac.mm
@@ -39,7 +39,8 @@
 #include <AppKit/AppKit.h>
 
 QT_BEGIN_NAMESPACE
-[[nodiscard]] Q_GUI_EXPORT QColor qt_mac_toQColor(const NSColor *color);
+[[nodiscard]] Q_CORE_EXPORT bool qt_mac_applicationIsInDarkMode(); // Since 5.12
+[[nodiscard]] Q_GUI_EXPORT QColor qt_mac_toQColor(const NSColor *color); // Since 5.8
 QT_END_NAMESPACE
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
@@ -499,9 +500,13 @@ bool Utils::isTitleBarColorized()
 
 bool Utils::shouldAppsUseDarkMode_macos()
 {
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 0))
+    return qt_mac_applicationIsInDarkMode();
+#else
     const auto appearance = [NSApp.effectiveAppearance bestMatchFromAppearancesWithNames:
                             @[NSAppearanceNameAqua, NSAppearanceNameDarkAqua]];
     return [appearance isEqualToString:NSAppearanceNameDarkAqua];
+#endif
 }
 
 bool Utils::setBlurBehindWindowEnabled(const WId windowId, const BlurMode mode, const QColor &color)
@@ -573,6 +578,11 @@ bool Utils::isBlurBehindWindowSupported()
     return result;
 }
 
+void Utils::registerThemeChangeNotification()
+{
+    // ### TODO
+}
+
 FRAMELESSHELPER_END_NAMESPACE
 
 #include "utils_mac.moc"
diff --git a/src/core/utils_win.cpp b/src/core/utils_win.cpp
index c646622..f18d3bc 100644
--- a/src/core/utils_win.cpp
+++ b/src/core/utils_win.cpp
@@ -1870,4 +1870,11 @@ void Utils::setQtDarkModeAwareEnabled(const bool enable, const bool pureQuick)
 #endif // (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 }
 
+void Utils::registerThemeChangeNotification()
+{
+    // On Windows we don't need to subscribe to the theme change event
+    // manually. Windows will send the theme change notification to all
+    // top level windows by default.
+}
+
 FRAMELESSHELPER_END_NAMESPACE