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-rw-r--r--ace/config-aix-4.2.x.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/ace/config-aix-4.2.x.h b/ace/config-aix-4.2.x.h
index fd11cd526cf..2a7dc792286 100644
--- a/ace/config-aix-4.2.x.h
+++ b/ace/config-aix-4.2.x.h
@@ -46,7 +46,9 @@
#define ACE_HAS_POSIX_TIME
#define ACE_HAS_SVR4_TIME
#define ACE_HAS_THREADS
-#define ACE_MT_SAFE
+#if !defined (ACE_MT_SAFE)
+ #define ACE_MT_SAFE 1
+#endif
#define ACE_HAS_UTIME
#define ACE_HAS_SELECT_H
#define ACE_NEEDS_DEV_IO_CONVERSION