--- a/configure.in
+++ b/configure.in
@@ -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: 1.216 $)
+AC_REVISION($Revision: 1.217 $)
 AC_PREREQ(2.9)
 AC_INIT(src/octave.cc)
 AC_CONFIG_HEADER(config.h)
@@ -149,26 +149,26 @@
 AC_SUBST(LIBINFO)
 AC_SUBST(INFO_DIR)
 
-### Allow the user disable support for plplot.
-
-# USE_PLPLOT=true
-# PLPLOT_DIR=plplot
-# LIBPLPLOT=../plplot/libplplot.a
+dnl ### Allow the user disable support for plplot.
+dnl 
+dnl # USE_PLPLOT=true
+dnl # PLPLOT_DIR=plplot
+dnl # LIBPLPLOT=../plplot/libplplot.a
 USE_PLPLOT=false
 PLPLOT_DIR=""
 LIBPLPLOT=""
-AC_ARG_ENABLE(plplot,
-  [  --enable-plplot         use plplot for plotting (default is yes)],
-  [if test $enableval = no; then
-     USE_PLPLOT=false;
-     LIBPLPLOT="";
-     PLPLOT_DIR="";
-   fi], [])
-if $USE_PLPLOT; then
-  AC_DEFINE(USE_PLPLOT, 1)
-fi
-AC_SUBST(LIBPLPLOT)
-AC_SUBST(PLPLOT_DIR)
+dnl AC_ARG_ENABLE(plplot,
+dnl   [  --enable-plplot         use plplot for plotting (default is yes)],
+dnl   [if test $enableval = no; then
+dnl      USE_PLPLOT=false;
+dnl      LIBPLPLOT="";
+dnl      PLPLOT_DIR="";
+dnl    fi], [])
+dnl if $USE_PLPLOT; then
+dnl   AC_DEFINE(USE_PLPLOT, 1)
+dnl fi
+dnl AC_SUBST(LIBPLPLOT)
+dnl AC_SUBST(PLPLOT_DIR)
 
 ### Allow the user disable support for command line editing using GNU
 ### readline.