08:09 <jacobat> Say I have a gem A that exists in two versions. One is compatible with ActiveRecord < 5 and one is compatible with ActiveRecord ~> 5.0.0. Now I have another gem B dependent on A that should work with both versions of A. But only A ~> 1.3 or A ~> 2.1. Can I declare this dependency in my gemspec? Or is there another pattern I should use?

08:28 <jhass> while http://ruby-doc.org/stdlib-2.3.1/libdoc/rubygems/rdoc/Gem/Specification.html#method-i-add_runtime_dependency takes multiple specifications, it's an AND thing afaik, so probably impossible