--- libaitsched/configure.in	2026/05/19 15:56:20	1.61.2.1
+++ libaitsched/configure.in	2026/05/20 04:07:04	1.62
@@ -1,6 +1,6 @@
 #
 # $Author: misho $
-# $Id: configure.in,v 1.61.2.1 2026/05/19 15:56:20 misho Exp $
+# $Id: configure.in,v 1.62 2026/05/20 04:07:04 misho Exp $
 #
 AC_INIT(libaitsched, 8.6, misho@elwix.org)
 AC_CONFIG_SRCDIR([src/aitsched.c])
@@ -136,6 +136,20 @@ AC_ARG_WITH(elwix,
 				;;
 		esac ],)
 AC_MSG_RESULT($ELWIX)
+
+ATOMIC=no
+AC_MSG_CHECKING(Enable atomic lock support)
+AC_ARG_ENABLE(atomic,
+	[  --enable-atomic         Enable atomic lock support ],
+	[ ATOMIC=$enableval
+		case "$enableval" in
+			yes)
+				AC_DEFINE(ATOMIC_SUPPORT,, [atomic lock support])
+				;;
+			*)
+				;;
+	 	esac ], )
+AC_MSG_RESULT($ATOMIC)
 
 DEBIAN_ARCH=$target_cpu
 AS_IF([ test "x$target_cpu" = "xarm6l" -o "x$target_cpu" = "xarm7l" ], DEBIAN_ARCH="armhf")