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-rw-r--r--src/system.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/system.h b/src/system.h
index 45be5d184..0f471e5d1 100644
--- a/src/system.h
+++ b/src/system.h
@@ -156,6 +156,11 @@ initialize_exit_failure (int status)
# define R_OK 4
#endif
+#if !defined O_DIRECT && defined O_DIRECTIO
+/* Tru64 spells it `O_DIRECTIO'. */
+# define O_DIRECT O_DIRECTIO
+#endif
+
#if !defined O_DIRECT
# define O_DIRECT 0
#endif