* configure.in: add comment for --with-x default values

* config.guess: handle Motorola Delta88 box for SVR3 and SVR4.
	* Makefile.in: add check-* targets for each of the directories in
	the tree.  Add a definition of RUNTEST that will use the one we
	just built, if it exists.  Pass this down via FLAGS_TO_PASS.

configure.in

@@ -111,7 +111,8 @@ esac
 # it's not even worth trying to configure, much less build, that tool.
 
 case ${with_x} in
-  yes)  ;;
+  yes)  # the default value for this tree is that X11 is available
+	;;
   no | "")
     	configdirs=`echo ${configdirs} | sed -e 's/tk//'`
 	;;