For the doxygen job, the list of used libraries is generated using
For many classes, this returns `nullptr`, e.g. TNamed.
For some, however, it works. But it's not because they are in a rootmap, e.g. `RooGaussian`:
Also, at least in the working examples I found, it doesn't do what the documentation promises. It only returns the first library, but not the library this one depends on. See the example above. The doc is here: