ative to the current dir do

                    incdir = include_directories(dirname)

                    After this incdir will contain both the current source dir as well as the
                    corresponding build dir. It can then be used in any subdirectory and
                    Meson will take care of all the busywork to make paths work.

                    Dirname can even be '.' to mark the current directory. Though you should
                    remember that the current source and build directories are always
                    put in the include directories by default so you only need to do
                    include_directories('.') if you intend to use the result in a
                    different subdirectory.

                    Note that this error message can also be triggered by
                    external dependencies being installed within your source
                    tree - it's not recommended to do this.
                    z&include_directories sandbox violation!rV