Support for the Ruby 2.2 series has ended. See here for reference.
# File tk/lib/tkextlib/itk/incr_tk.rb, line 24 def self.package_name PACKAGE_NAME end
# File tk/lib/tkextlib/itk/incr_tk.rb, line 28 def self.package_version begin TkPackage.require('Itk') rescue '' end end