more of the devtools 2 packages can't be rebuild because many missign BRs. the most important: maven maven-antrun-plugin maven-compiler-plugin maven-site-plugin tycho httpcomponents-project jaxen sonatype-oss-parent
just a side note, all rhel packages can be rebuild on rhel (suppose all repos are accessible which needed eg: supplementary etc) it'd be a very bad way not to follow this not written standard....
Installing Maven from Fedora 19 will probably do the job. But again we speak for 100+ packages so there is no way rebuilding can be supported for DTS 2.0 Eclipse with the case of most Java packages using Maven which is not part of RHEL 6.x.
*** This bug has been marked as a duplicate of bug 976433 ***