nbsd702# irb24
irb(main):001:0> require 'active_support'
Gem::MissingSpecVersionError: Gem::MissingSpecVersionError
        from /usr/pkg/lib/ruby/2.4.0/rubygems/dependency.rb:310:in `to_specs'
        from /usr/pkg/lib/ruby/2.4.0/rubygems/specification.rb:1445:in `block in activate_dependencies'
        from /usr/pkg/lib/ruby/2.4.0/rubygems/specification.rb:1434:in `each'
        from /usr/pkg/lib/ruby/2.4.0/rubygems/specification.rb:1434:in `activate_dependencies'
        from /usr/pkg/lib/ruby/2.4.0/rubygems/specification.rb:1416:in `activate'
        from /usr/pkg/lib/ruby/2.4.0/rubygems.rb:220:in `rescue in try_activate'
        from /usr/pkg/lib/ruby/2.4.0/rubygems.rb:213:in `try_activate'
        from /usr/pkg/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:126:in `rescue in require'
        from /usr/pkg/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:39:in `require'
        from (irb):1
        from /usr/pkg/bin/irb24:12:in `<main>'