PROJECT_COMPAT_VERSION ---------------------- .. versionadded:: 4.1 .. note:: Experimental. Gated by ``CMAKE_EXPERIMENTAL_EXPORT_PACKAGE_INFO``. Value given to the ``COMPAT_VERSION`` option of the most recent call to the :command:`project` command, if any. To obtain the compatibility version of the top level project, see the :variable:`CMAKE_PROJECT_COMPAT_VERSION` variable.