The Equinox compatibility features should be installed if a uses constraint violation related to 'javax.annotation' can be observed between 'org.eclipse.osgi' and 'com.google.guava' after installing GEF FX, GEF MVC, GEF MVC.FX, or GEF Zest.FX. This violation will occur only in certain situations. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=478461 for details.