--- a/acconfig.h	Wed Jun 05 23:21:52 1996 +0000
+++ b/acconfig.h	Thu Jun 06 05:09:24 1996 +0000
@@ -27,6 +27,9 @@
 /* Define if your system has a single-arg prototype for gettimeofday. */
 #undef GETTIMEOFDAY_NO_TZ 
 
+/* Define if your gnuplot supports multiplt plot windows with X11. */
+#undef GNUPLOT_HAS_FRAMES
+
 /* Define if your gnuplot has mutliplot. */
 #undef GNUPLOT_HAS_MULTIPLOT
 

--- a/configure.in	Wed Jun 05 23:21:52 1996 +0000
+++ b/configure.in	Thu Jun 06 05:09:24 1996 +0000
@@ -20,7 +20,7 @@
 ### along with Octave; see the file COPYING.  If not, write to the Free
 ### Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
-AC_REVISION($Revision: 1.206 $)
+AC_REVISION($Revision: 1.207 $)
 AC_PREREQ(2.9)
 AC_INIT(src/octave.cc)
 AC_CONFIG_HEADER(config.h)
@@ -991,6 +991,13 @@
   else
     AC_MSG_RESULT([no])
   fi
+  AC_MSG_CHECKING([to see if your gnuplot supports multiple plot windows])
+  if test -z "`echo 'set term x11 2' | $GNUPLOT_BINARY 2>&1`"; then
+    AC_MSG_RESULT([yes])
+    AC_DEFINE(GNUPLOT_HAS_FRAMES, 1)
+  else
+    AC_MSG_RESULT([no])
+  fi
 else
   AC_MSG_WARN([I didn't find gnuplot.  It isn't necessary to have gnuplot])
   AC_MSG_WARN([installed, but you won't be able to use any of Octave's])

--- a/src/pt-plot.cc	Wed Jun 05 23:21:52 1996 +0000
+++ b/src/pt-plot.cc	Thu Jun 06 05:09:24 1996 +0000
@@ -69,6 +69,9 @@
 // The name of the shell command to execute to start gnuplot.
 static string Vgnuplot_binary;
 
+// TRUE if gnuplot appears to support multiple plot windows with X11.
+static bool Vgnuplot_has_frames;
+
 // TRUE if gnuplot appears to support multiplot.
 static bool Vgnuplot_has_multiplot;
 
@@ -1085,6 +1088,14 @@
 }
 
 static int
+gnuplot_has_frames (void)
+{
+  Vgnuplot_has_frames = check_preference ("gnuplot_has_frames");
+
+  return 0;
+}
+
+static int
 gnuplot_has_multiplot (void)
 {
   Vgnuplot_has_multiplot = check_preference ("gnuplot_has_multiplot");
@@ -1101,6 +1112,15 @@
   DEFVAR (gnuplot_binary, "gnuplot", 0, gnuplot_binary,
     "path to gnuplot binary");
 
+#ifdef GNUPLOT_HAS_FRAMES
+  double with_frames = 1.0;
+#else
+  double with_frames = 0.0;
+#endif
+
+  DEFVAR (gnuplot_has_frames, with_frames, 0, gnuplot_has_frames,
+    "true if gnuplot supports multiple plot windows on X11, false otherwise");
+
 #ifdef GNUPLOT_HAS_MULTIPLOT
   double with_multiplot = 1.0;
 #else