From 5420bec4c6ccf193e5a827a68d39088fee565755 Mon Sep 17 00:00:00 2001
From: Matt Whitlock <qt@mattwhitlock.name>
Date: Thu, 15 Jan 2026 20:52:38 -0500
Subject: [PATCH] cmake: fix finding Qt private headers with Qt >=6.10

Qt private header directories only get added to the include search path
when the "Qt6::${component}Private" library is added to the target.
---
 Source/WebCore/PlatformQt.cmake | 7 +++++++
 Source/cmake/OptionsQt.cmake    | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/Source/WebCore/PlatformQt.cmake b/Source/WebCore/PlatformQt.cmake
index e787b33c375a..59599cbfbbe1 100644
--- a/Source/WebCore/PlatformQt.cmake
+++ b/Source/WebCore/PlatformQt.cmake
@@ -311,6 +311,13 @@ 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 e6bb8e240f4e..c1f30b3774f3 100644
--- a/Source/cmake/OptionsQt.cmake
+++ b/Source/cmake/OptionsQt.cmake
@@ -80,6 +80,11 @@ macro(CHECK_Qt6_PRIVATE_INCLUDE_DIRS _qt_component _header)
     set(CMAKE_REQUIRED_INCLUDES ${Qt6${_qt_component}_PRIVATE_INCLUDE_DIRS})
     set(CMAKE_REQUIRED_LIBRARIES Qt6::${_qt_component})
 
+    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 ()
+
     # Avoid check_include_file_cxx() because it performs linking but doesn't support CMAKE_REQUIRED_LIBRARIES (doh!)
     check_cxx_source_compiles("${INCLUDE_TEST_SOURCE}" Qt6${_qt_component}_PRIVATE_HEADER_FOUND)