prerm is in libbpp-raa-dev 2.1.0-1ubuntu2.
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 | #! /bin/bash
# Abort if any command returns an error value
set -e
removeGeneric() {
  if [ -f $1.all ]
  then
    echo "-- Remove generic include file: $1.all"
    rm $1.all
  fi
  for file in "$1"/*
  do
    if [ -d "$file" ]
    then
      # Recursion:
      removeGeneric $file
    fi
  done
}
if [ "$1" = "remove" ]; then
  # Actualize .all files
  removeGeneric /usr/include/Bpp
fi
exit 0
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