message: Set Qt variables only if QT_CMAKE_MODULE_PATH is set
diff: @@ -154,6 +154,9 @@ message(STATUS "Boost_LIBRARIES: ${Boost_LIBRARIES}")
  # ============================================================================================
  message(STATUS "=== Qt =====================================================================")
  if (ENABLE_GUI)
  + if ("${QT_CMAKE_MODULE_PATH}" STREQUAL "")
  + message(STATUS "QT_CMAKE_MODULE_PATH not given, using Qt from system")
  + else()
  set(Qt5Core_DIR "${QT_CMAKE_MODULE_PATH}/Qt5Core")
  set(Qt5Widgets_DIR "${QT_CMAKE_MODULE_PATH}/Qt5Widgets")
  set(Qt5WebView_DIR "${QT_CMAKE_MODULE_PATH}/Qt5WebView")
  @@ -169,6 +172,7 @@ if (ENABLE_GUI)
  set(Qt5Qml_DIR "${QT_CMAKE_MODULE_PATH}/Qt5Qml")
  set(Qt5Network_DIR "${QT_CMAKE_MODULE_PATH}/Qt5Network")
  set(Qt5QmlModels_DIR "${QT_CMAKE_MODULE_PATH}/Qt5QmlModels")
  + endif()
  # Find includes in corresponding build directories
  set(CMAKE_INCLUDE_CURRENT_DIR ON)
  