CMAKE__IMPLICIT_INCLUDE_DIRECTORIES ----------------------------------------- Directories implicitly searched by the compiler for header files. CMake does not explicitly specify these directories on compiler command lines for language ````. This prevents system include directories from being treated as user include directories on some compilers, which is important for ``C``, ``CXX``, and ``CUDA`` to avoid overriding standard library headers. This value is not used for ``Fortran`` because it has no standard library headers and some compilers do not search their implicit include directories for module ``.mod`` files.