/usr/lib/ruby/2.0.0/tkextlib/tcllib/ is in ruby2.0-tcltk 2.0.0.484-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/2.0.0/tkextlib/tcllib/autoscroll.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/calendar.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/canvas_sqmap.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/canvas_zoom.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/chatwidget.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/crosshair.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/ctext.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/cursor.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/dateentry.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/datefield.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/diagrams.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/dialog.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/getstring.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/history.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/ico.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/ip_entry.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/khim.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/menuentry.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/ntext.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/panelframe.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/plotchart.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/ruler.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/screenruler.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/scrolledwindow.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/scrollwin.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/setup.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/statusbar.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/style.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/superframe.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/swaplist.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/tablelist.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/tablelist_core.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/tablelist_tile.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/tkpiechart.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/toolbar.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/tooltip.rb
/usr/lib/ruby/2.0.0/tkextlib/tcllib/widget.rb