This file is indexed.

prerm is in qt4-qmake 4:4.8.1-0ubuntu4.

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.

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#!/bin/sh

set -e

case "$1" in
    upgrade) ;;
    remove|failed-upgrade|deconfigure)
        update-alternatives --remove qmake "/usr/bin/qmake-qt4"
        ;;
esac