Arch Linux

Description: Building the man-db package involves running groff to generate the man-db manual, which contains the current date. Groff attempts to respect the SOURCE_DATE_EPOCH env variable to enable reproducible builds, but it still checks the real timezone to convert the Unix timestamp into a date. If the timezone is different from the timezone the package was originally built in, this can output a different date, resulting in differences in the built package.

Steps to reproduce:
1) Install package "archlinux-repro" via pacman
2) Download man-db-2.9.3-1-x86_64.pkg.tar.zst from an archive or mirror
3) Set local timezone to UTC+5 or higher e.g. by doing "timedatectl set-timezone Australia/Sydney"
4) Run "repro /path/to/downloaded/man-db-2.9.3-1-x86_64.pkg.tar.zst"
5) (Optional) Run "diffoscope ./build/man-db-2.9.3-1-x86_64.pkg.tar.zst /path/to/downloaded/man-db-2.9.3-1-x86_64.pkg.tar.zst" to see differences