Semicolon-separated list of directories specifying a search path for the find_file() and find_path() commands. By default it is empty, it is intended to be set by the project. See also CMAKE_SYSTEM_INCLUDE_PATH and CMAKE_PREFIX_PATH.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_INCLUDE_PATH.html