--- libaitsess/configure.in	2008/09/30 20:11:27	1.1.2.1
+++ libaitsess/configure.in	2011/04/30 21:35:21	1.2
@@ -1,6 +1,6 @@
 #
 # $Author: misho $
-# $Id: configure.in,v 1.1.2.1 2008/09/30 20:11:27 misho Exp $
+# $Id: configure.in,v 1.2 2011/04/30 21:35:21 misho Exp $
 #
 AC_INIT(libaitsess, 2.0, misho@openbsd-bg.org)
 AC_CONFIG_SRCDIR([src/aitsess.c])
@@ -32,6 +32,20 @@ AC_FUNC_MALLOC
 AC_FUNC_MMAP
 AC_CHECK_FUNCS([bzero memset munmap])
 
+# 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([$msg])
+
 DEBUG=no
 AC_MSG_CHECKING(Debug Build)
 AC_ARG_ENABLE(debug,
@@ -40,6 +54,7 @@ AC_ARG_ENABLE(debug,
 		case "$enableval" in
 			yes)
 				AC_DEFINE(__DEBUG,, [Build libraries with debug information and additional messages])
+				CFLAGS="-g ${CFLAGS}"
 				;;
 			*)
 				;;