CMAKE_INCLUDE_CURRENT_DIR

Automatically add the current source and build directories to the include path.

If this variable is enabled, CMake automatically adds CMAKE_CURRENT_SOURCE_DIR and CMAKE_CURRENT_BINARY_DIR to the include path for each directory. These additional include directories do not propagate down to subdirectories. This is useful mainly for out-of-source builds, where files generated into the build tree are included by files located in the source tree.

By default CMAKE_INCLUDE_CURRENT_DIR is OFF.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.15/variable/CMAKE_INCLUDE_CURRENT_DIR.html