--- libaitio/configure.in	2011/12/13 02:23:07	1.14
+++ libaitio/configure.in	2013/08/13 00:17:27	1.39
@@ -1,11 +1,14 @@
 #
 # $Author: misho $
-# $Id: configure.in,v 1.14 2011/12/13 02:23:07 misho Exp $
+# $Id: configure.in,v 1.39 2013/08/13 00:17:27 misho Exp $
 #
-AC_INIT(libaitio, 2.2, misho@elwix.org)
+AC_INIT(libaitio, 5.6, 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
@@ -20,7 +23,10 @@ CFLAGS="-Wall -O2 -fPIC -I/usr/local/include ${CFLAGS}
 LDFLAGS="-L/usr/local/lib ${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])
 
 # Checks for header files.
 AC_CHECK_HEADERS([stdlib.h string.h sys/ioctl.h termios.h unistd.h])
@@ -29,10 +35,25 @@ 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])
+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([$msg])
+
 DEBUG=no
 AC_MSG_CHECKING(Debug Build)
 AC_ARG_ENABLE(debug,
@@ -40,7 +61,6 @@ AC_ARG_ENABLE(debug,
 	[ DEBUG=$enableval
 		case "$enableval" in
 			yes)
-				AC_DEFINE(__DEBUG,, [Build libraries with debug information and additional messages])
 				CFLAGS="-g ${CFLAGS}"
 				;;
 			*)
@@ -52,7 +72,7 @@ AC_MSG_RESULT($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)