cmake: fix build with Qt 6.10

Author: iamsergio

.github/workflows/build.yml

@@ -33,7 +33,7 @@ jobs:
             qt_modules: qtscxml qtremoteobjects
             qt_arch: win64_msvc2019_64
             macos_architectures: "x86_64;arm64"
-          - qt_version: 6.9.0 # Bump to latest freely
+          - qt_version: 6.10.0 # Bump to latest freely
             qt_modules: qtscxml qtremoteobjects
             qt_arch: win64_msvc2022_64
             macos_architectures: "x86_64;arm64"

CHANGES

@@ -2,6 +2,7 @@ Version 2.2.0:
 --------------
  * Bump to Graphviz 13.1.0
  * Remove Qt 5 support to simplify maintenance
+ * Fix build with Qt 6.10
 
 Version 2.1.0:
 --------------

CMakeLists.txt

@@ -142,6 +142,12 @@ set_package_properties(
     PURPOSE "Needed for the Qt SCXML adapter (adapter itself depends on Qt RemoteObjects)"
 )
 
+if(Qt6Gui_VERSION VERSION_GREATER_EQUAL "6.10.0")
+    set(QT_NO_PRIVATE_MODULE_WARNING ON)
+    find_package(Qt6GuiPrivate REQUIRED NO_MODULE)
+    find_package(Qt6ScxmlPrivate REQUIRED NO_MODULE)
+endif()
+
 include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 include(CheckIncludeFiles)