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variable_requires
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-----------------
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Disallowed since version 3.0. See CMake Policy :policy:`CMP0035`.
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Use the :command:`if` command instead.
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Assert satisfaction of an option's required variables.
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.. code-block:: cmake
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variable_requires(TEST_VARIABLE RESULT_VARIABLE
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REQUIRED_VARIABLE1
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REQUIRED_VARIABLE2 ...)
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The first argument (``TEST_VARIABLE``) is the name of the variable to be
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tested, if that variable is false nothing else is done. If
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``TEST_VARIABLE`` is true, then the next argument (``RESULT_VARIABLE``)
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is a variable that is set to true if all the required variables are set.
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The rest of the arguments are variables that must be true or not set
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to ``NOTFOUND`` to avoid an error. If any are not true, an error is
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reported.
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