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.. note::
A call to :command:`target_link_libraries(<target> ...)` may update this
property on ``<target>``. If ``<target>`` was not created in the same
directory as the call then :command:`target_link_libraries` will add a
suffix of the form ``::@<directory-id>`` to each entry, where the
``::@`` is a separator and the ``<directory-id>`` is unspecified.
This tells the generators that the named libraries must be looked up in
the scope of the caller rather than in the scope in which the
``<target>`` was created. Valid directory ids are stripped on export
by the :command:`install(EXPORT)` and :command:`export` commands.