tests: Add Autoconf 2.63 compatibility support for AS_VAR_APPEND.

Reported-by: William Tu <u9012063@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

diff --git a/tests/ovs-macros.at b/tests/ovs-macros.at
index bfd0681..6c0f58d 100644 (file)
--- a/tests/ovs-macros.at
+++ b/tests/ovs-macros.at
@@ -153,3 +153,12 @@ on_exit () {
     mv cleanup.tmp cleanup
 }
 ])
+
+dnl Autoconf 2.63 compatibility verison of macro introduced in Autoconf 2.64:
+m4_ifndef([AS_VAR_APPEND],
+  [m4_divert_text([PREPARE_TESTS],
+    [as_var_append () {
+       eval $1=\$$1\$2
+     }
+])
+   m4_define([AS_VAR_APPEND], [as_var_append $1 $2])])