Is there something I can put in my .gemspec to indicate that the gem
only work with JRuby? I’m working on a gem that wraps Java libraries,
requires JRuby. I couldn’t find any information on this. It seems like
can only specify platform and (numeric) ruby version in the gemspec.
I’ll of course document this requirement, but it would be nice if the
simply fails to install with a reasonable error (or is not even
for install) with MRI Ruby. If there’s nothing I can do in .gemspec,
can do something else to make the installation fail?