net-irc/ircd-hybrid can't be merged side by side with net-analyser/net-snmp nor sys-devel/prelink because of blocking dependencie on dev-libs/libelf versus dev-libs/elfutils. It's very annoying. I'have no idea of differences between those two libs, but ircd-hybrid does work with elfutils
btw, current stable release of ircd-hybrid is 7.1.3 and renaming of ebuild and altering the dependency worked for me.
I removed the dependency, grepping the code didn't show anything that needs it.