Ensure that log4qt uses the Qt defined by CTK. This is accomplished by passing QT_QMAKE_EXECUTABLE into the cmake command used no configure log4Qt.

CMakeExternals/log4qt.cmake

@@ -14,6 +14,7 @@ IF(${add_project})
         SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/Utilities/${proj}
         CMAKE_ARGS
           ${ep_common_args}
+          -DQT_QMAKE_EXECUTABLE:FILEPATH=${QT_QMAKE_EXECUTABLE}
         )
     SET(log4qt_DIR ${ep_install_dir})
   ENDIF()