error: cannot find symbol 'MENU_SELECTION_MANAGER_LISTENER_KEY'

Question

I compile jdk source codes (jdk-7u79-linux-x64.tar.gz) and encounter the following error.

jdk_src/javax/swing/MenuSelectionManager.java:66: error: cannot find symbol
                Object o = context.get(SwingUtilities2.MENU_SELECTION_MANAGER_LISTENER_KEY);
                                                      ^
  symbol:   variable MENU_SELECTION_MANAGER_LISTENER_KEY
  location: class SwingUtilities2

There is no SwingUtilities2.java at all in src.zip and nowhere to define MENU_SELECTION_MANAGER_LISTENER_KEY. How to fix it?