Hi, I was able to reproduce the FTBFS in a clean sid container. The fix is to add python3-certifi as a direct Build-Depends (under <!nocheck>), and I've opened a merge request for that:
https://salsa.debian.org/morph/httpcore/-/merge_requests/1 With that change, dpkg-buildpackage -us -uc -b succeeds: 165 tests pass, 49 are deselected, and there are 6 expected XPASS. The resulting package still has python3-certifi in its runtime dependencies. Thanks, Miguel
