$ texexec test resolvers | trees | analyzing 'home:texmf' mtxrun | kpse fallback with progname 'context' initialized in 0.076419 seconds/usr/lib64/ruby/2.2.0/rubygems.rb:16:in `require': cannot load such file -- rubygems/compatibility (LoadError) from /usr/lib64/ruby/2.2.0/rubygems.rb:16:in `<top (required)>' from <internal:gem_prelude>:1:in `require' from <internal:gem_prelude>:1:in `<compiled>'
It is sad to read that you have problems with the software. The situation seems to be a bit more complicate and requires some analysis. Please reinstall a recent ruby and retest. Also prepare the emerge --info https://wiki.gentoo.org/wiki/Attach_the_logs_to_the_bug_ticket Please collect also as many details as possible on our support channels and reopen the ticket. https://www.gentoo.org/support/