Is there a way to build a gem in such a way so that dependencies can be
resolved at installation-time?

I want users to be able to "gem install ruby-debug-ide", and have the
ruby-debug-ide gem install either ruby-debug-base or ruby-debug-base19,
depending on the version of Ruby that they're running.

I'm thinking maybe extconf.rb could do this, but just wanted to see if
anyone had any ideas.
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