[ruby-list:42879] RDtool 0.6.20 正常に作動せず。@ruby 1.8.5

質問させてください。RDtoolについてです。
ruby 1.8.5 (2006-08-25) [powerpc-darwin7.9.0]
で、~/Desktop
上にて、rd2を使い、testrd.rd > testrd.txt とすると、下記
のようにエラーになります。
正しくrd2で出力を得るためにはどうしたらいいでしょうか。
なお、RDtoolのバージョンは以下のとおりです。
　RDtool -- rd2 0.6.20
　RDtool Framework -- Document Tree 0.6.20
　RDtool Framework -- Visitor 0.6.20
<エラー引用ここから>
/usr/local/lib/ruby/site_ruby/optparse.rb:1004: warning:
character class has `]' without escape
/usr/local/lib/ruby/site_ruby/optparse.rb:1004: warning:
character class has `[' without escape
/usr/local/lib/ruby/site_ruby/optparse.rb:1011: warning:
character class has `]' without escape
/usr/local/lib/ruby/site_ruby/optparse.rb:1011: warning:
character class has `[' without escape
lib/rd/rdinlineparser.ry:447:in `next_token': undefined
method `terminate' for #<StringScanner_R 0/16  @
"?244?263?244?354?244..."> (NoMethodError)
from
/usr/local/lib/ruby/site_ruby/1.8/racc/parser.rb:99:in
`_racc_do_parse_c'
from
/usr/local/lib/ruby/site_ruby/1.8/racc/parser.rb:99:in
`__send__'
from
/usr/local/lib/ruby/site_ruby/1.8/racc/parser.rb:99:in
`do_parse'
from lib/rd/rdinlineparser.ry:372:in `parse'
from lib/rd/rdblockparser.ry:38:in `_reduce_12'
from /usr/local/bin/rd2:177:in `_racc_do_parse_c'
from
/usr/local/lib/ruby/site_ruby/1.8/racc/parser.rb:99:in
`catch'
from
/usr/local/lib/ruby/site_ruby/1.8/racc/parser.rb:99:in
`_racc_do_parse_c'
from
/usr/local/lib/ruby/site_ruby/1.8/racc/parser.rb:99:in
`__send__'
from
/usr/local/lib/ruby/site_ruby/1.8/racc/parser.rb:99:in
`do_parse'
from lib/rd/rdblockparser.ry:262:in `parse'
from /usr/local/lib/ruby/site_ruby/1.8/rd/tree.rb:50:in
`parse'
from /usr/local/bin/rd2:216
<エラー引用ここまで>

なお、RDtool0.6.16ではなんとか出力は可能です。

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