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-rw-r--r--libio/libio.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/libio/libio.h b/libio/libio.h
index c8231df3ab..3c6bef9b37 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -137,6 +137,8 @@
 #define _IO_BAD_SEEN 0x4000
 #define _IO_USER_LOCK 0x8000
 
+#define _IO_FLAGS2_MMAP 1
+
 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 #define _IO_SKIPWS 01
 #define _IO_LEFT 02
@@ -282,7 +284,11 @@ struct _IO_FILE {
   struct _IO_FILE *_chain;
 
   int _fileno;
+#if 0
   int _blksize;
+#else
+  int _flags2;
+#endif
   _IO_off_t _old_offset; /* This used to be _offset but it's too small.  */
 
 #define __HAVE_COLUMN /* temporary */