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/CMake 3.19

CMAKE_INCLUDE_DIRECTORIES_BEFORE

Whether to append or prepend directories by default in include_directories().

This variable affects the default behavior of the include_directories() command. Setting this variable to ON is equivalent to using the BEFORE option in all uses of that command.

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https://cmake.org/cmake/help/v3.19/variable/CMAKE_INCLUDE_DIRECTORIES_BEFORE.html