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-rw-r--r--src/s/aix3-1.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/s/aix3-1.h b/src/s/aix3-1.h
index ed3e5c83a0f..3c33b210153 100644
--- a/src/s/aix3-1.h
+++ b/src/s/aix3-1.h
@@ -220,3 +220,6 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* AIX doesn't define this. */
#define unix 1
+
+/* AIX 3.1 has the HFT features. */
+#define AIXHFT