[DRE-maint] Bug#830097: Could not find 'tins' (~> 1.0)

[Andreas Beckmann]

Followup-For: Bug #830097

Similar probles in jessie:

ruby -e 'gem "file-tail"'
/usr/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find 'tins' (~> 1.0) among 9 total gem(s) (Gem::LoadError)
        from /usr/lib/ruby/2.1.0/rubygems/specification.rb:1295:in `block in activate_dependencies'
        from /usr/lib/ruby/2.1.0/rubygems/specification.rb:1284:in `each'
        from /usr/lib/ruby/2.1.0/rubygems/specification.rb:1284:in `activate_dependencies'
        from /usr/lib/ruby/2.1.0/rubygems/specification.rb:1266:in `activate'
        from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:54:in `gem'
        from -e:1:in `<main>'

Andreas