Checking patch manual/filesys.texi...
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The flags argument in @code{@dots{}at} functions can be a combination of
the following flags, defined in @file{fcntl.h}.  Not all such functions
support all flags, and some (such as @code{openat}) do not accept a
flags argument at all.

In the flag descriptions below, the @dfn{effective final path component}
refers to the final component (basename) of the full path constructed
from the descriptor and file name arguments, using file name lookup, as
described above.

@vtable @code
@item AT_EMPTY_PATH

error: patch failed: manual/filesys.texi:310
error: manual/filesys.texi: patch does not apply