Check for HP/UX curses problems. Define  _XOPEN_SOURCE_EXTENDED and
STRICT_SYSV_CURSES when compiling curses module on HP/UX. Generalize
access to _flags on systems where WINDOW is opaque. Fixes bugs
#432497, #422265, and the curses parts of #467145 and #473150.
diff --git a/acconfig.h b/acconfig.h
index 9e30ab5..94826ad 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -232,6 +232,12 @@
 /* Define if you want to compile in rudimentary thread support */
 #undef WITH_THREAD
 
+/* Define if mvwdelch in curses.h is an expression. */
+#undef MVWDELCH_IS_EXPRESSION
+
+/* Define if WINDOW in curses.h offers a field _flags. */
+#undef WINDOW_HAS_FLAGS
+
 
 /* Leave that blank line there-- autoheader needs it! */