$NetBSD: patch-configure,v 1.2 2019/01/15 15:48:17 wiz Exp $

Skip missing include directories.

--- configure.orig
+++ configure
@@ -11429,6 +11429,9 @@ echo "$ac_t""$cf_cv_ncurses_h2" 1>&6
 if test -n "$cf_1st_incdir" ; then
   for cf_add_incdir in $cf_1st_incdir
   do
+    if ! [ -d $cf_add_incdir ]; then
+      continue;
+    fi
 	while test $cf_add_incdir != /usr/include
 	do
 	  if test -d $cf_add_incdir
