The systemd.pc file (for use by pkg-config) was moved from the systemd package to the systemd-dev package in version 256~rc2-1. Therefore, require either systemd-dev or a version of systemd before that version, in order to be guaranteed the presence of the systemd.pc file.
* debian/control (Source: mandos/Build-Depends): Add version qualifier "(< 256~rc2-1)" to "systemd".
|| dpkg --compare-versions "$2" eq "1.8.0-1~bpo9+1"; then
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if grep --quiet --regexp='^[[:space:]]*key_id[[:space:]]*=[[:space:]]*[Ee]3[Bb]0[Cc]44298[Ff][Cc]1[Cc]149[Aa][Ff][Bb][Ff]4[Cc]8996[Ff][Bb]92427[Aa][Ee]41[Ee]4649[Bb]934[Cc][Aa]495991[Bb]7852[Bb]855[[:space:]]*$' /etc/mandos/clients.conf; then