prerm is in darkplaces-server 0~20130304+svn11952-2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #!/bin/sh
set -e
case "$1" in
    (upgrade|deconfigure|failed-upgrade)
	;;
    (remove)
        update-alternatives --remove quake-engine-server /usr/games/darkplaces-server
        ;;
    (*)
        echo "Unknown prerm action: $1" >&2
        exit 1
        ;;
esac
#vim:set sw=4 sts=4 et:
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