New in version 3.15.
A CMake language file or module to be included as the last step of all project() command calls. This is intended for injecting custom code into project builds without modifying their source.
See also the CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE, CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE and CMAKE_PROJECT_INCLUDE_BEFORE variables.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_PROJECT_INCLUDE.html