PREUN

/bin/sh

if [[ "$1" = "0" ]]; then
  perl -ni -e "/^DICT\s*es\s*MX\s*es_MX$/ or print" /usr/share/dict/ooo/dictionary.lst
fi

POSTIN

/bin/sh

if [[ ! -f "/usr/share/dict/ooo/dictionary.lst" ]] ||       ! grep -q "^DICT[ \t]*es[ \t]*MX[ \t]*es_MX" /usr/share/dict/ooo/dictionary.lst
then
  echo "DICT es MX es_MX" >> /usr/share/dict/ooo/dictionary.lst
fi