Whether to force prepending of project include directories.
This variable affects the order of include directories generated in compiler command lines. If set to ON, it causes the CMAKE_SOURCE_DIR and the CMAKE_BINARY_DIR to appear first.
© 2000–2016 Kitware, Inc.
© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.7/variable/CMAKE_INCLUDE_DIRECTORIES_PROJECT_BEFORE.html