977415+: "klayout: reproducible builds: Binaries contain build timestamps"
977416+: "klayout: reproducible builds: /usr/bin/klayout broken when /bin/sh points to bash"
version.sh sets KLAYOUT_VERSION_DATE without specifingy timezone,
locale or using SOURCE_DATE_EPOCH.
Our notes about issues affecting packages are stored in notes.git and are targeted at packages in Debian in 'unstable/amd64' (unless they say otherwise).