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-rw-r--r--libio/libio.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libio/libio.h b/libio/libio.h
index 6f9c418c31..428e035540 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -142,6 +142,7 @@
 #ifdef _LIBC
 # define _IO_FLAGS2_FORTIFY 4
 #endif
+#define _IO_FLAGS2_USER_WBUF 8
 
 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 #define _IO_SKIPWS 01