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infodir=usr/share/info file=mjpeg-howto.info post_install() { [[ -x usr/bin/install-info ]] || return 0 install-info $infodir/$file.gz $infodir/dir 2> /dev/null } post_upgrade() { post_install $1 } pre_remove() { [[ -x usr/bin/install-info ]] || return 0 install-info --delete $infodir/$file.gz $infodir/dir 2> /dev/null }