libconf-0.42.10 creates, and places its conf2xml.so in the following directory: /usr/lib6464/ruby/site_ruby/1.8/x86_64-linux This should be placed in /usr/lib64/ruby/site_ruby/1.8/x86_64-linux instead.
lines 48-52 in the ebuild could probably be dropped then
corrected in libconf-0.42.10-r1
I can confirm it works properly with libconf-0.42.10-r1 -- no more /usr/lib6464.
Thanks. Marking verified