Hello,
Those days there is quite a lot of fun put in rebuilding packages. I see
two packages for which a rebuild might be directly helpful:
* pdftk : uses libgcj8 -- which conflicts against libgcj9
* inkscape : crashes while opening PDFs, probably due to libpoppler update.

So if Thierry, or anyone else, feels like pushing the fun up to there,
please don't hesitate :-D

See you,
Eric