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diff --git a/octave_packages/m/plot/gnuplot_binary.m b/octave_packages/m/plot/gnuplot_binary.m
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+++ b/octave_packages/m/plot/gnuplot_binary.m
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+## Copyright (C) 2008-2012 John W. Eaton
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn  {Loadable Function} {[@var{prog}, @var{args}] =} gnuplot_binary ()
+## @deftypefnx {Loadable Function} {[@var{old_prog}, @var{old_args}] =} gnuplot_binary (@var{new_prog}, @var{arg1}, @dots{})
+## Query or set the name of the program invoked by the plot command
+## when the graphics toolkit is set to "gnuplot".  Additional arguments to
+## pass to the external plotting program may also be given.
+## The default value is @code{"gnuplot"} without additional arguments.
+## @xref{Installation}.
+## @end deftypefn
+
+## Author: jwe
+
+function [prog, args] = gnuplot_binary (new_prog, varargin)
+
+  persistent gp_binary = "gnuplot";
+  persistent gp_args = {};
+
+  if (nargout > 0 || nargin == 0)
+    prog = gp_binary;
+    args = gp_args;
+  endif
+
+  if (nargin == 1)
+    if (ischar (new_prog))
+      if (! isempty (new_prog))
+	gp_binary = new_prog;
+      else
+	error ("gnuplot_binary: value must not be empty");
+      endif
+    else
+      error ("gnuplot_binary: expecting program to be a character string");
+    endif
+  endif
+
+  if (nargin > 1)
+    if (iscellstr (varargin))
+      gp_args = varargin;
+    else
+      error ("gnuplot_binary: expecting arguments to be character strings");
+    endif
+  endif
+
+endfunction