$NetBSD: patch-configure.ac,v 1.1 2023/09/07 19:38:15 vins Exp $

Check for closefrom(). 

--- configure.ac.orig	2019-01-04 13:38:34.000000000 +0000
+++ configure.ac
@@ -55,6 +55,7 @@ fi
 
 AC_CHECK_FUNCS([fork setxattr fdatasync splice vmsplice utimensat])
 AC_CHECK_FUNCS([posix_fallocate])
+AC_CHECK_FUNCS([closefrom])
 AC_CHECK_MEMBERS([struct stat.st_atim])
 AC_CHECK_MEMBERS([struct stat.st_atimespec])