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`DOXYGEN_DOT_FOUND` is only set if `_Doxygen_keep_backward_compat` is used (when no components are requested), so use `Doxygen_dot_FOUND` directly. Preserve the "YES" or "NO" value used previously.
See the "Find Modules" section of the cmake-developer(7) manual page. For more information about how to contribute modules to CMake, see this page: https://cmake.org/Wiki/CMake:Module_Maintainers