File: preinst

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#!/bin/sh

dpkg --assert-support-predepends 2> /dev/null

case $? in
 0) exit 0 ;; # fine, supported
 1) exit 1 ;; # dpkg writes an error message to stdio
 2) cat <<EOT
This package requires features of dpkg unavailable in this version.
Please upgrade to a more recent version (>=1.1.0) of dpkg.
EOT
    exit 1 ;; # dpkg didn't recognise the option
 *) exit 2 ;;
esac