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-rw-r--r--ext/tk/lib/tkextlib/vu/pie.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/vu/pie.rb b/ext/tk/lib/tkextlib/vu/pie.rb
index cacca594e6..b4506e10b5 100644
--- a/ext/tk/lib/tkextlib/vu/pie.rb
+++ b/ext/tk/lib/tkextlib/vu/pie.rb
@@ -2,6 +2,7 @@
# ::vu::pie widget
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
#
+require 'tk'
# create module/class
module Tk