diff --git a/Source/WebCore/PlatformQt.cmake b/Source/WebCore/PlatformQt.cmake
index 640836faa843..14d003c70dc8 100644
--- a/Source/WebCore/PlatformQt.cmake
+++ b/Source/WebCore/PlatformQt.cmake
@@ -315,6 +315,13 @@ list(APPEND WebCore_LIBRARIES
     ${ZLIB_LIBRARIES}
 )
 
+if (Qt6Gui_VERSION VERSION_GREATER_EQUAL 6.10)
+    list(APPEND WebCore_PRIVATE_LIBRARIES Qt6::GuiPrivate)
+endif ()
+if (Qt6Network_VERSION VERSION_GREATER_EQUAL 6.10)
+    list(APPEND WebCore_PRIVATE_LIBRARIES Qt6::NetworkPrivate)
+endif ()
+
 if (QT_STATIC_BUILD)
     list(APPEND WebCore_LIBRARIES
         ${STATIC_LIB_DEPENDENCIES}
diff --git a/Source/cmake/OptionsQt.cmake b/Source/cmake/OptionsQt.cmake
index d99e9c7bd625..2523a6f2c8ec 100644
--- a/Source/cmake/OptionsQt.cmake
+++ b/Source/cmake/OptionsQt.cmake
@@ -71,12 +71,13 @@ macro(CONVERT_PRL_LIBS_TO_CMAKE _qt_component)
 endmacro()
 
 macro(CHECK_Qt6_PRIVATE_INCLUDE_DIRS _qt_component _header)
-    # Qt6 provides private headers via Qt6::${_qt_component}Private target
-    find_package(Qt6${_qt_component}Private QUIET CONFIG)
+    set(CMAKE_REQUIRED_LIBRARIES Qt6::${_qt_component})
 
-    if (NOT TARGET Qt6::${_qt_component}Private)
-        message(FATAL_ERROR "Qt6::${_qt_component}Private target not found. Please make sure Qt6 private headers are installed.")
-    endif()
+    # Qt 6.10+ provides private headers via Qt6::${_qt_component}Private target
+    if (Qt6${_qt_component}_VERSION VERSION_GREATER_EQUAL 6.10)
+        find_package(Qt6 ${REQUIRED_QT_VERSION} REQUIRED COMPONENTS ${_qt_component}Private)
+        list(APPEND CMAKE_REQUIRED_LIBRARIES Qt6::${_qt_component}Private)
+    endif ()
 
     set(INCLUDE_TEST_SOURCE
     "
@@ -85,9 +86,6 @@ macro(CHECK_Qt6_PRIVATE_INCLUDE_DIRS _qt_component _header)
     "
     )
 
-    # Use the Private target directly - it provides the include dirs automatically
-    set(CMAKE_REQUIRED_LIBRARIES Qt6::${_qt_component} Qt6::${_qt_component}Private)
-
     check_cxx_source_compiles("${INCLUDE_TEST_SOURCE}" Qt6${_qt_component}_PRIVATE_HEADER_FOUND)
 
     unset(INCLUDE_TEST_SOURCE)
diff --git a/Tools/QtTestBrowser/CMakeLists.txt b/Tools/QtTestBrowser/CMakeLists.txt
index 160f101d6d75..df2df312df84 100644
--- a/Tools/QtTestBrowser/CMakeLists.txt
+++ b/Tools/QtTestBrowser/CMakeLists.txt
@@ -44,7 +44,6 @@ set(QtTestBrowser_SYSTEM_INCLUDE_DIRECTORIES
 
 set(QtTestBrowser_LIBRARIES
     Qt6::Gui
-    Qt6::GuiPrivate
     Qt6::Network
     Qt6::Widgets
     WebKitWidgets
@@ -55,6 +54,13 @@ if (TARGET Qt6::PrintSupport)
     list(APPEND QtTestBrowser_LIBRARIES Qt6::PrintSupport)
 endif ()
 
+if (Qt6Core_VERSION VERSION_GREATER_EQUAL 6.10)
+    list(APPEND QtTestBrowser_PRIVATE_LIBRARIES Qt6::CorePrivate)
+endif ()
+if (Qt6Gui_VERSION VERSION_GREATER_EQUAL 6.10)
+    list(APPEND QtTestBrowser_PRIVATE_LIBRARIES Qt6::GuiPrivate)
+endif ()
+
 qt_add_resources(QtTestBrowser_SOURCES
     QtTestBrowser.qrc
 )