In the BGL package we get a warning like:
```
/home/cgal-testsuite/cgal_doc_build/CGAL-5.4-Ic-33/doc/BGL/PackageDescription.txt:29: warning: ignoring \dot command because HAVE_DOT is not set
```
The BGL package uses the `\dot` and has now to use the setting `HAVE_DOT=YES` to see the dot image.
Till now this went OK as the `\dot` command didn't look at the setting of the `HAVE_DOT` setting in the Doxyfile, though by the issue https://github.com/doxygen/doxygen/issues/7273 and the pull request https://github.com/doxygen/doxygen/pull/8663 it is now required that `HAVE_DOT` is set.
The idea of setting `HAVE_DOT` for the BGL project removed the warning (and shows the figure again) though has also as side effect that the inheritance graphs are shown. Until now CGAL shows for the inheritance just the text version.
Doxygen now has for the `CLASS_GRAPH` setting the possibility `TEXT` that does exactly what is required.
Due to the general setting of `HAVE_DOT` also the not needed `graph_legend` was generated and some `INCLUDE_GRAPH`s, by setting this to `NO ` these are no suppressed as well.
```
warning: Tag 'LATEX_SOURCE_CODE' at line 1971 of file '.../doc_dxy/BaseDoxyfile' has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
warning: Tag 'RTF_SOURCE_CODE' at line 2061 of file '.../doc_dxy/BaseDoxyfile' has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
warning: Tag 'DOCBOOK_PROGRAMLISTING' at line 2166 of file '.../BaseDoxyfile' has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
```
these tags have been declared obsolete (in the current master version), so they should be removed..
CGAL doesn't use the involved formats so this has no influence on the CGAL documentation processing.