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MACOSX_RPATH
------------
Whether this target on Mac OS X is located at runtime using rpaths.
When this property is set to true, the directory portion of
the "install_name" field of this shared library will be ``@rpath``
unless overridden by :prop_tgt:`INSTALL_NAME_DIR`. This indicates
the shared library is to be found at runtime using runtime
paths (rpaths).
This property is initialized by the value of the variable
:variable:`CMAKE_MACOSX_RPATH` if it is set when a target is
created.
Runtime paths will also be embedded in binaries using this target and
can be controlled by the :prop_tgt:`INSTALL_RPATH` target property on
the target linking to this target.
Policy CMP0042 was introduced to change the default value of
MACOSX_RPATH to ON. This is because use of ``@rpath`` is a
more flexible and powerful alternative to ``@executable_path`` and
``@loader_path``.
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