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-rw-r--r--lib/stdio-impl.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/stdio-impl.h b/lib/stdio-impl.h
index 067b95ebd64..15066aa59f8 100644
--- a/lib/stdio-impl.h
+++ b/lib/stdio-impl.h
@@ -175,7 +175,7 @@
# define fp_ fp
# endif
-# if defined _SCO_DS /* OpenServer */
+# if defined _SCO_DS || (defined __SCO_VERSION__ || defined __sysv5__) /* OpenServer 5, OpenServer 6, UnixWare 7 */
# define _cnt __cnt
# define _ptr __ptr
# define _base __base