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-rw-r--r--sysdeps/mach/hurd/bits/posix_opt.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/mach/hurd/bits/posix_opt.h b/sysdeps/mach/hurd/bits/posix_opt.h
index 47a81c3f73..c6cdf530f3 100644
--- a/sysdeps/mach/hurd/bits/posix_opt.h
+++ b/sysdeps/mach/hurd/bits/posix_opt.h
@@ -31,8 +31,8 @@
 /* Processes have a saved set-user-ID and a saved set-group-ID.  */
 #define	_POSIX_SAVED_IDS	1
 
-/* Synchronizing file data is supported.  */
-#define	_POSIX_SYNCHRONIZED_IO	1
+/* Synchronizing file data is supported, but msync is missing.  */
+#undef _POSIX_SYNCHRONIZED_IO
 
 /* The fsync function is present.  */
 #define	_POSIX_FSYNC	1