I've tested building the 11.3.1-1 sources on a clean container with tzdata 2024b-5, and then immediately with 2025a-1, and both passed without errors with default timezone 'Etc/UTC'. Changing timezone to Berlin like the reproducible builds has didn't change the outcome.
$ dpkg -l | grep tzdata ii tzdata 2025a-1 all time zone and daylight-saving time data $ ln -sf /usr/share/zoneinfo/Europe/Berlin /etc/localtime $ dpkg-reconfigure tzdata Current default time zone: 'Europe/Berlin' Local time is now: Fri Jan 31 10:59:51 CET 2025. Universal Time is now: Fri Jan 31 09:59:51 UTC 2025. dpkg-buildpackage -b ... === RUN TestParsesEnv --- PASS: TestParsesEnv (0.00s) However, if I 'apt purge tzdata' I am able to reproduce this issue: === RUN TestParsesEnv env_test.go:265: unexpected error: unknown time zone Europe/Berlin So seems this package should depend on tzdata. The time zone in question is in the base package, and Europe/Berlin is not among the deprecated time zones in legacy package: $ apt-file search /usr/share/zoneinfo/Europe/Berlin tzdata: /usr/share/zoneinfo/Europe/Berlin