CMake: Explictly add QtOpenGLWidgets

Necessary for manually-compiled Qt 6.9 builds.

cMake/FreeCAD_Helpers/PrintFinalReport.cmake

@@ -166,6 +166,7 @@ macro(PrintFinalReport)
     simple(QtCore ${QtCore_VERSION})
     simple(QtNetwork ${QtNetwork_VERSION})
     conditional(QtOpenGL BUILD_GUI "not needed" ${QtOpenGL_VERSION})
+    conditional(QtOpenGLWidgets BUILD_GUI "not needed" ${QtOpenGLWidgets_VERSION})
     conditional(QtPrintSupport BUILD_GUI "not needed" ${QtPrintSupport_VERSION})
     conditional(QtSvg BUILD_GUI "not needed" ${QtSvg_VERSION})
     conditional(QtUiTools BUILD_GUI "not needed" ${QtUiTools_VERSION})

cMake/FreeCAD_Helpers/SetupQt.cmake

@@ -13,6 +13,7 @@ if(BUILD_GUI)
     elseif (FREECAD_QT_MAJOR_VERSION EQUAL 6)
         list (APPEND FREECAD_QT_COMPONENTS GuiTools)
         list (APPEND FREECAD_QT_COMPONENTS SvgWidgets)
+        list (APPEND FREECAD_QT_COMPONENTS OpenGLWidgets)
     endif()
 
     list (APPEND FREECAD_QT_COMPONENTS OpenGL PrintSupport Svg UiTools Widgets LinguistTools)

src/Gui/CMakeLists.txt

@@ -128,6 +128,7 @@ target_include_directories(
     ${QtCore_INCLUDE_DIRS}
     ${QtWidgets_INCLUDE_DIRS}
     ${QtOpenGL_INCLUDE_DIRS}
+    ${QtOpenGLWidgets_INCLUDE_DIRS}
     ${QtPrintSupport_INCLUDE_DIRS}
     ${QtSvg_INCLUDE_DIRS}
     ${QtSvgWidgets_INCLUDE_DIRS}
@@ -139,6 +140,7 @@ list(APPEND FreeCADGui_LIBS
     ${QtCore_LIBRARIES}
     ${QtWidgets_LIBRARIES}
     ${QtOpenGL_LIBRARIES}
+    ${QtOpenGLWidgets_LIBRARIES}
     ${QtPrintSupport_LIBRARIES}
     ${QtSvg_LIBRARIES}
     ${QtSvgWidgets_LIBRARIES}