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-rw-r--r--src/s/aix4.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/s/aix4.h b/src/s/aix4.h
index 8ff7a81e5cf..0fe3cd79eff 100644
--- a/src/s/aix4.h
+++ b/src/s/aix4.h
@@ -1,3 +1,5 @@
+#define AIX4
+
#include "aix3-2.h"
/* AIX 4 does not have HFT any more. */