Now the the source releases lack some files:
Source:
betelgeuse@pena /var/tmp/portage/dev-java/itp-1.5.0/work/itp-gpl-1.5.0 $ ls
LICENSE.txt src/
Binary:
betelgeuse@pena ~/btdown/itp-gpl-1.5.0 $ ls
docs/ examples/ lib/ LICENSE.txt README_ILF.txt README_ITP.txt README.txt RELEASE_NOTES_ILF.txt RELEASE_NOTES_ITP.txt
With Linux Distributions starting to package more and more stuff it's important for Java upstreams to also be aware of packaging. We do it from the source releases so if we want to make the release notes and examples available easily to Linux users they need to be included in the source releases.
http://overlays.gentoo.org/proj/java/wiki/How_to_be_a_good_upstream
The Gentoo bug tracking the inclusion of your package:
https://bugs.gentoo.org/show_bug.cgi?id=172030