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-rw-r--r--ace/config-linux-common.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/ace/config-linux-common.h b/ace/config-linux-common.h
index 618cdf4d884..97f7a617623 100644
--- a/ace/config-linux-common.h
+++ b/ace/config-linux-common.h
@@ -108,7 +108,9 @@
// ONLY define this if you have config'd multicast into a 2.x kernel.
// If you do anything else, we've never tested it!
+#if ! defined(ACE_HAS_IP_MULTICAST)
#define ACE_HAS_IP_MULTICAST
+#endif /* #if ! defined(ACE_HAS_IP_MULTICAST) */
#define ACE_HAS_LONG_FDMASK