This file is indexed.

preinst is in apt-build 0.12.42.

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

if [ "upgrade" = "$1" ] ; then
  if dpkg --compare-versions "$2" lt '0.10.0' ; then
    rm -f /usr/bin/gcc
	  rm -f /usr/bin/g++
	  dpkg-divert --package apt-build --remove --rename /usr/bin/gcc
	  dpkg-divert --package apt-build --remove --rename /usr/bin/g++
  fi
fi

# remove obsolete config file from apt-build <= 0.12.37
if dpkg-maintscript-helper supports rm_conffile 2>/dev/null ; then
  dpkg-maintscript-helper rm_conffile /etc/apt/sources.list.d/apt-build -- "$@"
fi