Issue #4052 has been updated by Yui NARUSE.

Status changed from Open to Assigned
Assigned to set to Yukihiro Matsumoto

NetBSD has lutime(2).
http://netbsd.gw.com/cgi-bin/man-cgi?lutimes++NetBSD-current

Windows Vista or later can set symbolic on NTFS by CreateFile with FILE_FLAG_OPEN_REPARSE_POINT flag and SetFileTime.
http://msdn.microsoft.com/en-us/library/aa365682(VS.85).aspx Symbolic Link Effects on File Systems Functions
http://msdn.microsoft.com/en-us/library/ms724933(VS.85).aspx SetFileTime Function
http://msdn.microsoft.com/en-us/library/aa363858(VS.85).aspx CreateFile Function

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http://redmine.ruby-lang.org/issues/show/4052

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