postrm 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.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | #!/bin/sh
set -e
if [ "$1" = purge ] ; then
  rm -f /etc/apt/apt-build.conf
  
  # prepare APT and apt-build information
  eval $(apt-config shell etcdir Dir::Etc)
  eval $(apt-config shell sourceslist Dir::Etc::sourcelist)
  eval $(apt-config shell sourcesparts Dir::Etc::sourceparts)
  sourceslist=/"$etcdir""$sourceslist"
  sourcesparts=/"$etcdir""$sourcesparts"
  aptbuildsource="$sourcesparts"/apt-build.list
  
  ## remove repository directory if it is empty
  #db_get apt-build/repository_dir
  #repository_dir="$RET"
  #if [ $(zcat "$repository_dir"/Packages.gz | wc -l) -eq 0 ] ; then
  #  rm -rf "$repository_dir"
  #fi
  #
  ## remove build directory if it is empty
  #db_get apt-build/build_dir
  #build_dir="$RET"
  #if [ -d "$build_dir" ] && [ ! $(ls -A "$build_dir") ] ; then
  #  rm -rf "$build_dir"
  #fi
  
  # remove apt-build.list resource file
  if [ -f "$aptbuildsource" ] ; then
    rm -f "$aptbuildsource"
  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
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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