CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE

A CMake language file or module to be included as the first step of any project() command calls that specify <PROJECT-NAME> as the project name. This is intended for injecting custom code into project builds without modifying their source.

See also the CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE, CMAKE_PROJECT_INCLUDE and CMAKE_PROJECT_INCLUDE_BEFORE variables.