src/ruby/lib/grpc/grpc.rb

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begin
  ruby_version_dirname = /(\d+\.\d+)/.match(RUBY_VERSION).to_s
  distrib_lib_dir = File.expand_path(ruby_version_dirname,
                                     File.dirname(__FILE__))
  if File.directory?(distrib_lib_dir)
    require_relative "#{distrib_lib_dir}/grpc_c"
  else
    require_relative 'grpc_c'
  end
end