| CMAKE_DEPENDS_IN_PROJECT_ONLY | |
| ----------------------------- | |
| When set to ``TRUE`` in a directory, the build system produced by the | |
| :ref:`Makefile Generators` is set up to only consider dependencies on source | |
| files that appear either in the source or in the binary directories. Changes | |
| to source files outside of these directories will not cause rebuilds. | |
| This should be used carefully in cases where some source files are picked up | |
| through external headers during the build. |