| PROJECT_COMPAT_VERSION | |
| ---------------------- | |
| .. versionadded:: 4.3 | |
| 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. |