The name bibtex is still unused on rubygems. I mean the ruby suffix is redundant, isn't it?
Good idea. What would you suggest for legacy support? Keeping bibtex-ruby as an empty gem that depends on bibtex but is still updated for each release? Or is there a better way to do this?
Yes, you should keep bibtex-ruby as an empty gem. This works well. You could add a post install message (see the gemspec documentation) which says "this gem has been replaced by bibtex".