From: Eli Zaretskii <eliz@gnu.org>
Date: Fri, 7 Aug 2009 14:52:56 +0000 (+0000)
Subject: (calc-gnuplot-name) [windows-nt]: Use "pgnuplot" as the default.
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(calc-gnuplot-name) [windows-nt]: Use "pgnuplot" as the default.
---

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))