Correct usage of OPTION_DEFAULT_ON, OPTION_DEFAULT_OFF so that the

defaults are as they used to be.
Default `Carbon' to off (it's unsupported).

ChangeLog

+2008-01-25  Glenn Morris  <rgm@gnu.org>
+
+	* configure.in: Correct usage of OPTION_DEFAULT_ON,
+	OPTION_DEFAULT_OFF so that the defaults are as they used to be.
+	Default `Carbon' to off (it's unsupported).
+
 2008-01-24  Glenn Morris  <rgm@gnu.org>
 
 	* configure.in: Standardize dbus-related messages.

configure.in

@@ -101,6 +101,7 @@ fi
 
 OPTION_DEFAULT_ON([sound],[don't compile with sound support])
 
+dnl FIXME currently it is not the last.
 dnl This should be the last --with option, because --with-x is
 dnl added later on when we find the path of X, and it's best to
 dnl keep them together visually.
@@ -122,19 +123,24 @@ this option's value should be `yes', `no', `lucid', `athena', `motif' or `gtk'.
 	  with_x_toolkit=$val
 ])
 
-OPTION_DEFAULT_OFF([xpm],[use -lXpm for displaying XPM images])
-OPTION_DEFAULT_OFF([jpeg],[use -ljpeg for displaying JPEG images])
-OPTION_DEFAULT_OFF([tiff],[use -ltiff for displaying TIFF images])
-OPTION_DEFAULT_OFF([gif],[use -lgif (or -lungif) for displaying GIF images])
-OPTION_DEFAULT_OFF([png],[use -lpng for displaying PNG images])
-OPTION_DEFAULT_OFF([gpm],[use -lgpm for mouse support on a GNU/Linux console])
-OPTION_DEFAULT_OFF([rsvg],[use -lrsvg-2 for displaying SVG images])
-OPTION_DEFAULT_OFF([gtk],[use GTK (same as --with-x-toolkit=gtk)])
+dnl _ON results in a '--without' option in the --help output, so
+dnl the help text should refer to "don't compile", etc.
+OPTION_DEFAULT_ON([xpm],[don't compile with XPM image support])
+OPTION_DEFAULT_ON([jpeg],[don't compile with JPEG image support])
+OPTION_DEFAULT_ON([tiff],[don't compile with TIFF image support])
+OPTION_DEFAULT_ON([gif],[don't compile with GIF image support])
+OPTION_DEFAULT_ON([png],[don't compile with PNG image support])
+OPTION_DEFAULT_ON([rsvg],[don't compile with SVG image support])
+
+OPTION_DEFAULT_OFF([gtk],[use GTK toolkit])
 OPTION_DEFAULT_ON([toolkit-scroll-bars],[don't use Motif or Xaw3d scroll bars])
 OPTION_DEFAULT_ON([xaw3d],[don't use Xaw3d])
 OPTION_DEFAULT_ON([xim],[don't use X11 XIM])
-OPTION_DEFAULT_ON([carbon],[don't use Carbon GUI on Mac OS X])
-OPTION_DEFAULT_ON([dbus],[use D-Bus])
+OPTION_DEFAULT_OFF([carbon],[use Carbon GUI on Mac OS X. **UNSUPPORTED!**])
+
+OPTION_DEFAULT_ON([gpm],[don't use -lgpm for mouse support on a GNU/Linux console])
+OPTION_DEFAULT_OFF([dbus],[compile with D-Bus support])
+
 
 AC_ARG_WITH([pkg-config-prog],dnl
 [AS_HELP_STRING([--with-pkg-config-prog=PATH],