Estoy intentando ejecutar el script wsdl2ruby.rb que viene con la gema soap4r, y obtengo los siguientes errores:

[ral@lap etc]$ ruby /usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/bin/wsdl2ruby.rb
/usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/xsd/charset.rb:13: warning: variable $KCODE is no longer effective
/usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/soap/property.rb:68: warning: encoding option is ignored - u
/usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/soap/property.rb:69: warning: encoding option is ignored - u
/usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/soap/property.rb:70: warning: encoding option is ignored - u
/usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/xsd/xmlparser.rb:74:in `<top (required)>': XML processor module not found. (RuntimeError)
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from /usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/wsdl/xmlSchema/parser.rb:13:in `<top (required)>'
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from /usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/wsdl/xmlSchema/importer.rb:11:in `<top (required)>'
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from /usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/wsdl/importer.rb:9:in `<top (required)>'
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from /usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/lib/wsdl/soap/wsdl2ruby.rb:11:in `<top (required)>'
    from <internal:lib/rubygems/custom_require>:33:in `require'
    from <internal:lib/rubygems/custom_require>:33:in `rescue in require'
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from /usr/lib/ruby/gems/1.9.1/gems/soap4r-1.5.8/bin/wsdl2ruby.rb:5:in `<main>'

Tengo instaladas las siguientes gemas:

httpclient (2.2.0.1) rastrillo minitest (1.6.0) (0.8.7) rdoc (2.5.8) soap4r (1.5.8)

He intentado instalar la gema del analizador xml que falla con muchos errores:http: //pastie.org/182212

¿Alguien sabe cual es el problema? Esta es la primera vez que toco a Ruby.

Es soap4r la mejor herramienta para hacer un cliente de servicio web SOAP?

¡Muchas gracias