Does Mac OS X implement the XDG Base Directory Specification? If not, what's the equivalent of $XDG_RUNTIME_DIR? An application I help maintain needs a temporary directory in which binary (i.e., executable) files can be placed and executed. So this directory should be preferably unique to the user and must be guaranteed to allow files to have the executable bit set (if such a thing exists on the file systems used by Mac OS X).

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