Package: src:unrardll Version: 0.1.3-6 Severity: important Tags: sid bullseye User: [email protected] Usertags: python3.9
see https://buildd.debian.org/status/fetch.php?pkg=pyresample&arch=amd64&ver=1.16.0%2Bds-1%2Bb1&stamp=1602973583&raw=0 it looks like pandas is required for running the tests (but it's not yet built for 3.9), and it's not listed as a build dependency.
