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-rw-r--r--ext/tk/lib/tkextlib/tcllib/plotchart.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/tcllib/plotchart.rb b/ext/tk/lib/tkextlib/tcllib/plotchart.rb
index 86327ceff0..5603ce1283 100644
--- a/ext/tk/lib/tkextlib/tcllib/plotchart.rb
+++ b/ext/tk/lib/tkextlib/tcllib/plotchart.rb
@@ -78,6 +78,7 @@ module Tk
end
module Tk::Tcllib::Plotchart
+ extend TkCore
############################
def self.view_port(w, *args) # args := pxmin, pymin, pxmax, pymax
tk_call_without_enc('::Plotchart::viewPort', w.path, *(args.flatten))