Hi, I fixed this for Galera now in a quick defensive upload: https://tracker.debian.org/news/1762331/accepted-galera-4-26425-3-source-into-unstable/
It would be nicer though if those FTBFS bugs were not 'severe' and less urgent, so that there is time to e.g. import new upstream that has this and other fixes included and thus spend overall less maintenance work on a single package.
