There is a problem with dev-ruby/mp3info on 64-bit systems. The issue is described at the given URL. Basically, it tries to add a method to an Integer instance, which is okay on 32-bit systems where the instance is a Bignum, but not on 64-bit systems where it is a Fixnum, because Fixnum objects have immediate value. I will attach a patch here and I have also submitted the patch at the given URL but upstream appears to be dead so I doubt it will be merged.
Created attachment 125216 [details, diff] mp3info.patch
Ah maybe upstream isn't dead after all. Some changes including this one have just been merged so I guess a new release will be made shortly.
I guess we just need to wait for a new release then. James, please reopen this bug when there is a new release. Thanks
0.5.1 has been released and renaming the ebuild works. The update does appear to have hit the gems database but I don't think the file has hit all the mirrors yet.
0.5.1 is now in CVS. Thanks for tracking the issue and the alert.