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-------
Load and run CMake code from a file or module.
::
include(<file|module> [OPTIONAL] [RESULT_VARIABLE <VAR>]
[NO_POLICY_SCOPE])
Load and run CMake code from the file given. Variable reads and
writes access the scope of the caller (dynamic scoping). If ``OPTIONAL``
is present, then no error is raised if the file does not exist. If
``RESULT_VARIABLE`` is given the variable will be set to the full filename
which has been included or NOTFOUND if it failed.
If a module is specified instead of a file, the file with name
``<modulename>.cmake`` is searched first in :variable:`CMAKE_MODULE_PATH`,
then in the CMake module directory. There is one exception to this: if
the file which calls ``include()`` is located itself in the CMake builtin
module directory, then first the CMake builtin module directory is searched and
:variable:`CMAKE_MODULE_PATH` afterwards. See also policy :policy:`CMP0017`.
See the :command:`cmake_policy` command documentation for discussion of the
``NO_POLICY_SCOPE`` option.
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