diff --git a/configure.ac b/configure.ac
index 31dac05..7a296ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-# $Id: configure.ac,v 1.348 2006/08/04 09:44:23 dtucker Exp $
+# $Id: configure.ac,v 1.349 2006/08/17 09:35:49 dtucker Exp $
 #
 # Copyright (c) 1999-2004 Damien Miller
 #
@@ -15,7 +15,7 @@
 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 AC_INIT(OpenSSH, Portable, openssh-unix-dev@mindrot.org)
-AC_REVISION($Revision: 1.348 $)
+AC_REVISION($Revision: 1.349 $)
 AC_CONFIG_SRCDIR([ssh.c])
 
 AC_CONFIG_HEADER(config.h)
@@ -180,6 +180,12 @@
 		[#include <usersec.h>]
 	)
 	AC_CHECK_FUNCS(setauthdb)
+	AC_CHECK_DECL(F_CLOSEM,
+	    AC_DEFINE(USE_FCNTL_CLOSEM, 1, [Use F_CLOSEM fcntl for closefrom]),
+	    [],
+	    [ #include <limits.h>
+	      #include <fcntl.h> ]
+	)
 	check_for_aix_broken_getaddrinfo=1
 	AC_DEFINE(BROKEN_REALPATH, 1, [Define if you have a broken realpath.])
 	AC_DEFINE(SETEUID_BREAKS_SETUID, 1,