#!/bin/bash

curl -Ss "ftp://ftp.freepascal.org/pub/fpc/dist/" | \
  awk '{print $9}' | \
  grep '^[0-9.-]*$' | \
  sort -rV | \
  while read -r version
  do
    if curl "ftp://ftp.freepascal.org/pub/fpc/dist/${version}/source/" 2> /dev/null | \
      sed 's|^.* ||' | \
      grep -q "^fpcbuild-${version}\.tar\.gz\$"
    then
      echo "${version}"
      break
    fi
  done