<PROJECT-NAME>_VERSION
Value given to the VERSION option of the most recent call to the project() command with project name <PROJECT-NAME>, if any.
See also the component-wise version variables <PROJECT-NAME>_VERSION_MAJOR, <PROJECT-NAME>_VERSION_MINOR, <PROJECT-NAME>_VERSION_PATCH, and <PROJECT-NAME>_VERSION_TWEAK.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.15/variable/PROJECT-NAME_VERSION.html