diff --git a/configure.in b/configure.in
index 806be61579..50fa5e92dd 100644
--- a/configure.in
+++ b/configure.in
@@ -111,9 +111,9 @@ esac
 # it's not even worth trying to configure, much less build, that tool.
 
 case ${with_x} in
-  yes)  # the default value for this tree is that X11 is available
+  yes | "")  # the default value for this tree is that X11 is available
 	;;
-  no | "")
+  no)
     	configdirs=`echo ${configdirs} | sed -e 's/tk//'`
 	;;
   *)