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-rw-r--r--ace/config-aix-4.1.x.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ace/config-aix-4.1.x.h b/ace/config-aix-4.1.x.h
index 9c2baafd739..1ebd21479b8 100644
--- a/ace/config-aix-4.1.x.h
+++ b/ace/config-aix-4.1.x.h
@@ -1,7 +1,7 @@
/* -*- C++ -*- */
// $Id$
-#ifndef ACE_AIX_MAJOR_VERS
+#if !defined (ACE_AIX_MAJOR_VERS)
# define ACE_AIX_MAJOR_VERS 4
#endif
#if !defined (ACE_AIX_MINOR_VERS)