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-rw-r--r--lisp/calc/calc.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/calc/calc.el b/lisp/calc/calc.el
index 59dde099828..b291969b7f5 100644
--- a/lisp/calc/calc.el
+++ b/lisp/calc/calc.el
@@ -393,7 +393,7 @@ This is not required to be present for user-written mode annotations."
(string :tag "Closing annotation delimiter"))))
(defcustom calc-gnuplot-name
- "gnuplot"
+ (if (eq system-type 'windows-nt) "pgnuplot" "gnuplot")
"Name of GNUPLOT program, for calc-graph features."
:group 'calc
:type '(string))