Value given to the VERSION option of the most recent call to the project() command, if any.
See also the component-wise version variables PROJECT_VERSION_MAJOR, PROJECT_VERSION_MINOR, PROJECT_VERSION_PATCH, and PROJECT_VERSION_TWEAK.
© 2000–2016 Kitware, Inc.
© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.7/variable/PROJECT_VERSION.html