JBIDE-12310 a source feature was added to org.jboss.tools.maven.apt.feature, but the second part of the JIRA was never done – adding that feature to JBT and JBDS.
Today, I attempted to add it, and realized that unless we add org.jboss.tools.maven.apt.feature.source to the target platform it won't be available when creating the JBT or JBDS aggregate sites.
Do we care? Do we need the sources for this feature/plugin included in JBT and JBDS?
If we only need it in JBDS I can add the latest m2e mirror to the Central/Extras site  and be able to resolve it from there.