verify_digest(){	# $0 method file string
  case "$1" in
  *)
    DIGEST=`echo "$1" | tr a-z A-Z`
    [ "$DIGEST($2)= $3" = "`openssl $1 $2`" ]
    ;;
  esac
}
verify_signature(){	# $0 url|id sig
  case "$1" in
  0x*)
    gpg --recv-keys "$1" && gpg --verify "$2"
    ;;
  *)
    curl "$1" | gpg --import && gpg --verify "$2"
    ;;
  esac
}
error_out(){	# $0 message ...
  echo "$@" 1>&2
  exit 1
}

curl -RO -C - http://jaist.dl.sourceforge.net/sourceforge/clamav/clamav-0.88.tar.gz
curl -RO -C - http://jaist.dl.sourceforge.net/sourceforge/clamav/clamav-0.88.tar.gz.sig
verify_signature http://www.clamav.net/gpg/tkojm.gpg clamav-0.88.tar.gz.sig || error_out "$0: stopped at line $LINENO"

tar xvzf clamav-0.88.tar.gz
(cd clamav-0.88 && patch -p0 -b -z.org < ../clamav-0.88-sakuya.patch)