I understand that Eclipse Public License (EPL) v1.0 is not GPL compatible. This suggests that EPL is LGPL-3 compatible: https://lists.debian.org/debian-legal/2010/03/msg00017.html What about LGPL-2.1? There have been various other comments about it online, but none appeared definitive, e.g: http://mmilinkov.wordpress.com/2010/04/06/epl-gpl-commentary/#comment-293