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