The Gnumeric packages are in extras-devel allready. The problem is that the current Xournal packages (available only in a private repository atm) depend on a custom libart which uses a different package name than the libart-package Gnumeric depends on. The packages Gnumeric depends on are just straight ports of the corresponding Debian packages and i allready suggested Anidel (the maintainer of the Xournal packages) to rebuild Xournal using the libart which is used by Gnumeric. Anidel agreed that this would be the best - he also intends to upload Xournal to extras-devel, once he sorted out the problems.

My last contact with Anidel was about two weeks ago, so i do no know if he did anything about this issue yet.