It looks like the build failure is due to import checks on golang-github-cznic-mathutil.
I have written a patch to remove these checks and I was able to rebuild the package successfully using sbuild: ``` sbuild \ --arch-all \ --dist=unstable \ --nolog \ golang-github-cznic-fileutil_0.0~git20200808.2079183-3 \ --extra-package=golang-github-cznic-mathutil-dev_0.0~git20201220.c6aa83b-2_all.deb ``` The changes is waiting for review & upload. Cheers, -- Aloïs Micard (creekorful) <al...@micard.lu> GPG: DA4A A436 9BFA E299 67CD E85B F733 E871 0859 FCD2