--- libaitio/configure.in	2013/12/18 12:40:21	1.51
+++ libaitio/configure.in	2016/08/10 13:59:44	1.55.2.3
@@ -1,8 +1,8 @@
 #
 # $Author: misho $
-# $Id: configure.in,v 1.51 2013/12/18 12:40:21 misho Exp $
+# $Id: configure.in,v 1.55.2.3 2016/08/10 13:59:44 misho Exp $
 #
-AC_INIT(libaitio, 6.8, misho@elwix.org)
+AC_INIT(libaitio, 7.3, misho@elwix.org)
 AC_CONFIG_SRCDIR([src/aitio.c])
 AC_CONFIG_HEADERS([inc/config.h])
 
@@ -12,15 +12,16 @@ ac_cv_func_realloc_0_nonnull="yes"
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
+AC_PROG_RANLIB
 
 AC_CANONICAL_HOST
 AC_CANONICAL_TARGET
 
-AC_CHECK_TOOL(MKDEP, mkdep, no)
+AC_CHECK_TOOL(MKDEP, mkdep, ../mkdep)
 AC_SUBST(MKDEP)
 
-CFLAGS="-Wall -O2 -fPIC -I/usr/local/include ${CFLAGS}"
-LDFLAGS="-L/usr/local/lib ${LDFLAGS}"
+CFLAGS="-Wall -O2 -fPIC ${CFLAGS}"
+LDFLAGS="${LDFLAGS}"
 
 AC_CHECK_LIB([crypto], [EVP_CipherInit_ex])
 AC_CHECK_LIB([pthread], [pthread_mutex_init])
@@ -37,7 +38,7 @@ AC_C_INLINE
 
 # Checks for library functions.
 AC_FUNC_MMAP
-AC_CHECK_FUNCS([bzero memset munmap])
+AC_CHECK_FUNCS([bzero memset munmap fpurge])
 AC_CHECK_FUNCS([pthread_create pthread_exit])
 AC_CHECK_FUNCS([shm_open shm_unlink])
 
@@ -83,6 +84,20 @@ 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