Comment # 8 on bug 1056667 from Atri Bhattacharya

Thanks for the report. A fix, where we add the old HepMC2-devel to Factory as a
new package, is in progress. As soon as that is accepted, I will switch all the
packages dependent on HepMC but which don't yet support the upgraded HepMC >=
3.0 to build with the new (but really old) HepMC2.