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+## Copyright (C) 2008 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{val} =} gnuplot_binary ()
+## @deftypefnx {Loadable Function} {@var{old_val} =} gnuplot_binary (@var{new_val})
+## Query or set the name of the program invoked by the plot command.
+## The default value @code{\"gnuplot\"}.  @xref{Installation}.
+## @end deftypefn
+
+## Author: jwe
+
+function retval = gnuplot_binary (new_val)
+
+  persistent gp_binary = %OCTAVE_CONF_GNUPLOT%;
+
+  if (nargout > 0 || nargin == 0)
+    retval = gp_binary;
+  endif
+
+  if (nargin == 1)
+    if (ischar (new_val))
+      if (! isempty (new_val))
+	gp_binary = new_val;
+      else
+	error ("gnuplot_binary: value must not be empty");
+      endif
+    else
+      error ("gnuplot_binary: expecting arg to be a character string");
+    endif
+  elseif (nargin > 1)
+    print_usage ();
+  endif
+
+endfunction