--- libaitio/configure.in	2012/05/14 12:52:02	1.18.2.1
+++ libaitio/configure.in	2016/08/10 13:59:44	1.55.2.3
@@ -1,26 +1,34 @@
 #
 # $Author: misho $
-# $Id: configure.in,v 1.18.2.1 2012/05/14 12:52:02 misho Exp $
+# $Id: configure.in,v 1.55.2.3 2016/08/10 13:59:44 misho Exp $
 #
-AC_INIT(libaitio, 2.7, misho@elwix.org)
+AC_INIT(libaitio, 7.3, misho@elwix.org)
 AC_CONFIG_SRCDIR([src/aitio.c])
 AC_CONFIG_HEADERS([inc/config.h])
 
+ac_cv_func_malloc_0_nonnull="yes"
+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])
 AC_CHECK_LIB([util], [forkpty])
+AC_CHECK_LIB([rt], [aio_read])
+AC_CHECK_LIB([elwix], [crcFletcher16])
+AC_CHECK_LIB([aitsched], [schedRead])
 
 # Checks for header files.
 AC_CHECK_HEADERS([stdlib.h string.h sys/ioctl.h termios.h unistd.h])
@@ -29,10 +37,25 @@ AC_CHECK_HEADERS([stdlib.h string.h sys/ioctl.h termio
 AC_C_INLINE
 
 # Checks for library functions.
-AC_FUNC_MALLOC
-AC_FUNC_REALLOC
-AC_CHECK_FUNCS([memset regcomp strchr strerror])
+AC_FUNC_MMAP
+AC_CHECK_FUNCS([bzero memset munmap fpurge])
+AC_CHECK_FUNCS([pthread_create pthread_exit])
+AC_CHECK_FUNCS([shm_open shm_unlink])
 
+# It's stupid, but not all platforms have union semun, even those that need it.
+AC_MSG_CHECKING(looking for union semun in sys/sem.h)
+AC_TRY_COMPILE([
+		#include <sys/types.h>
+		#include <sys/ipc.h>
+		#include <sys/sem.h>
+		],[
+		union semun arg;
+		semctl(0, 0, 0, arg);
+		], [ 
+		AC_DEFINE(HAVE_UNION_SEMUN,, [union semun])
+		] msg=yes, msg=no )
+AC_MSG_RESULT([$msg])
+
 DEBUG=no
 AC_MSG_CHECKING(Debug Build)
 AC_ARG_ENABLE(debug,
@@ -40,7 +63,6 @@ AC_ARG_ENABLE(debug,
 	[ DEBUG=$enableval
 		case "$enableval" in
 			yes)
-				AC_DEFINE(__DEBUG,, [Build libraries with debug information and additional messages])
 				CFLAGS="-g ${CFLAGS}"
 				;;
 			*)
@@ -52,7 +74,7 @@ AC_MSG_RESULT($DEBUG)
 AIO=no
 AC_MSG_CHECKING(AIO Build)
 AC_ARG_ENABLE(aio,
-	[  --enable-aio            Build library with AIO operations], 
+	[  --enable-aio            Build library with AIO operations ], 
 	[ AIO=$enableval
 		case "$enableval" in
 			yes)
@@ -62,6 +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