When running doxygen:
warning: Tag `DETAILS_AT_TOP' at line 163 of file Doxyfile has become obsolete. To avoid this warning please update your configuration file using "doxygen -u"
I checked the doxygen changelog and this goes back to Doxygen Release 1.5.7 (release date 28-9-2008).
Added new option LAYOUT_FILE which can be used to specify a layout template file that tells doxygen in which order to generate the output and which titles to use for headings and how the navigation index will look; Read this for more info. As a result the following options are now obsolete since they can now only be controlled via the layout file: DETAILS_AT_TOP, ALPHABETICAL_INDEX. The following options can also be set via the layout file, but for convenience and backward compatibility reasons they are still also part of the configuration file: SHOW_INCLUDE_FILES, SHOW_USED_FILES, CLASS_GRAPH, COLLABORATION_GRAPH, GROUP_GRAPHS, INCLUDE_GRAPH, INCLUDED_BY_GRAPH. Run doxygen with the -l option to generate the default layout file.