After a long-ish wait the MegaMek folks put out great, new versions a couple weeks ago. I'm especially happy that this one runs with the latest Sun java6, unlike the current one in portage. I copied the existing ebuild over to match the new name and basically the ebuild probably could sort-of work as such, but for my local overlay I corrected the ${S} (there is no ${PN} dir any more, it all blows up open under ${WORKDIR}), and -- a slightly bigger problem -- some clumsy fingered MSDOS-using shell script editor has touched their startup.sh which needed to be dos2unix'ed. This I fixed manually as root after the emerge (not sure which is the best way to fix this inside an ebuild, could sed do it?).
in portage. thanks for the bug report.