As I said, if there weren’t a counterexample… and yes, my comment was written after trying to follow that guide and not ending up with a working system. (It would be convenient if there were a real installer for Gentoo.)
Anyway, I did come across something else interesting: It looks like Gentoo may default to Python 3, when we actually need to be running Python 2 for the extensions to work properly:
https://answers.launchpad.net/inkscape/+question/215655
Can you give that fix a try and see if it makes any difference?
