Many of the top-level build files from the 2.1 jfx repo were copied to the open-source root: openjfx/2.1/master. Several of these do not have a proper GPLv2+CLASSPATH copyright header. For example, build-defs.xml has the following:

<!--
/*
 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
 */
-->

This, and other files in build-src need to be updated with the proper open source header.

Logistically, this needs to first go into the internal jfx repo, and from there we can generate a patch to apply to the open master repo.