--- configure	2009-01-05 13:51:27.000000000 -0800
+++ configure	2009-01-05 14:50:56.000000000 -0800
@@ -9859,6 +9859,11 @@
 echo "$as_me:9860: checking if you want experimental reentrant code" >&5
 echo $ECHO_N "checking if you want experimental reentrant code... $ECHO_C" >&6
 
+# Opaque structures make binaries less likely to be incompatable with
+# future versions of ncurses.
+cf_cv_enable_opaque="NCURSES_INTERNALS"
+NCURSES_OPAQUE=1
+
 # Check whether --enable-reentrant or --disable-reentrant was given.
 if test "${enable_reentrant+set}" = set; then
   enableval="$enable_reentrant"
@@ -9904,7 +9904,7 @@
 else
 	cf_cv_enable_reentrant=0
 	cf_cv_enable_opaque="NCURSES_OPAQUE"
-	NCURSES_OPAQUE=0
+	NCURSES_OPAQUE=1
 	NCURSES_SIZE_T=short
 fi