--- libaitio/configure.in	2014/01/21 15:59:44	1.51.2.2
+++ libaitio/configure.in	2014/02/02 12:27:37	1.51.2.3
@@ -1,6 +1,6 @@
 #
 # $Author: misho $
-# $Id: configure.in,v 1.51.2.2 2014/01/21 15:59:44 misho Exp $
+# $Id: configure.in,v 1.51.2.3 2014/02/02 12:27:37 misho Exp $
 #
 AC_INIT(libaitio, 6.9, misho@elwix.org)
 AC_CONFIG_SRCDIR([src/aitio.c])
@@ -83,6 +83,20 @@ AC_ARG_ENABLE(aio,
 				;;
 		esac ],)
 AC_MSG_RESULT($AIO)
+
+ZCBUF=no
+AC_MSG_CHECKING(Zero-copy buffer Build)
+AC_ARG_ENABLE(zcpy-buffer,
+	[  --enable-zcpy-buffer    Build library with zero-copy buffer ], 
+	[ ZCBUF=$enableval
+		case "$enableval" in
+			yes)
+				AC_DEFINE(ZCBUF_ENABLE,, [Build library with zero-copy buffer])
+				;;
+			*)
+				;;
+		esac ],)
+AC_MSG_RESULT($ZCBUF)
 
 AC_CONFIG_FILES([Makefile
                  inc/Makefile