This file is indexed.

preinst is in qt4-qmake 4:4.8.5+git192-g085f851+dfsg-2ubuntu4.

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)
        if dpkg --compare-versions $2 "<<" 4:4.8.5
        then
            update-alternatives --remove qmake "/usr/bin/qmake-qt4"
        fi ;;
esac