/sys$common/syshlp/helplib.hlb DCE_IDL, DCL Command Interface, QUALIFIERS, /OUTPUT_DIRECTORY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

      /OUTPUT_DIRECTORY [=directory]
      /NOOUTPUT_DIRECTORY (default)

        This qualifier is equivalent to the -out directory
        argument in the universal syntax.