Recommend a gem version constraint if used in a extconf.rb file.
Recommend a gem version constraint if used in a extconf.rb file.

Unfortunately a runtime dependency for mini_portile within a gemspec is not
applied to the library loading mechanism, when the extconf.rb file of the given
gem is started. Therefore it must be specified there, equally.

flavorjones/mini_portile,luislavena/mini_portile,flavorjones/mini_portile,luislavena/mini_portile