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/usr/lib/ruby/2.3.0/tkextlib/itk.rb is in ruby2.3-tcltk 2.3.0-5ubuntu1.

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# frozen_string_literal: false
#
#  [incr Tk] support
#                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
#

# call setup script for general 'tkextlib' libraries
require 'tkextlib/setup.rb'

# call setup script
require 'tkextlib/itk/setup.rb'

# load library
require 'tkextlib/itk/incr_tk.rb'