https://bugzilla.samba.org/show_bug.cgi?id=10370

--- samba-4.0.19/source3/wscript
+++ samba-4.0.19/source3/wscript
@@ -507,9 +507,10 @@
     else:
         conf.DEFINE('HAVE_NO_AIO', '1')
 
-    if host_os.rfind('linux') > -1:
-	conf.CHECK_FUNCS_IN('io_submit', 'aio')
-	conf.CHECK_CODE('''
+    if Options.options.with_aio_support != False:
+	if host_os.rfind('linux') > -1:
+	    conf.CHECK_FUNCS_IN('io_submit', 'aio')
+	    conf.CHECK_CODE('''
 struct io_event ioev;
 struct iocb *ioc;
 io_context_t ctx;
@@ -526,11 +527,11 @@
 io_getevents(ctx, 1, 1, &ioev, &ts);
 ''',
 			'HAVE_LINUX_KERNEL_AIO',
-			msg='Checking for linux kernel asynchronous io support',
-			headers='unistd.h stdlib.h sys/types.h fcntl.h sys/eventfd.h libaio.h',
-			lib='aio')
+				msg='Checking for linux kernel asynchronous io support',
+				headers='unistd.h stdlib.h sys/types.h fcntl.h sys/eventfd.h libaio.h',
+				lib='aio')
 
-    conf.CHECK_CODE('''
+	    conf.CHECK_CODE('''
 struct msghdr msg;
 union {
         struct cmsghdr cm;
@@ -540,17 +541,17 @@
 msg.msg_controllen = sizeof(control_un.control);
 ''',
         'HAVE_MSGHDR_MSG_CONTROL',
-        msg='Checking if we can use msg_control for passing file descriptors',
-        headers='sys/types.h stdlib.h stddef.h sys/socket.h sys/un.h')
-    conf.CHECK_CODE('''
+    		msg='Checking if we can use msg_control for passing file descriptors',
+    		headers='sys/types.h stdlib.h stddef.h sys/socket.h sys/un.h')
+	    conf.CHECK_CODE('''
 struct msghdr msg;
 int fd;
 msg.msg_acctrights = (caddr_t) &fd;
 msg.msg_acctrightslen = sizeof(fd);
 ''',
         'HAVE_MSGHDR_MSG_ACCTRIGHTS',
-        msg='Checking if we can use msg_acctrights for passing file descriptors',
-        headers='sys/types.h stdlib.h stddef.h sys/socket.h sys/un.h')
+    		msg='Checking if we can use msg_acctrights for passing file descriptors',
+    		headers='sys/types.h stdlib.h stddef.h sys/socket.h sys/un.h')
 
     if Options.options.with_winbind:
         conf.env.build_winbind = True