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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