Rake migrate errors, but it still works

I get the errors below when running rake migrate, but it still works.
Is there anything to be bothered about? Some appear twice.

All of the below are installed from portage in Gentoo.

[email protected] ~/Site $ rake migrate
(in /home/me/Site)
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/validations.rb:334:
warning: *' interpreted as argument prefix /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/migration.rb:224: warning: instance variable @ignore_new_methods not initialized /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:41: warning: method redefined; discarding old allow_concurrency= /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/connection_adapters/sqlserver_adapter.rb:456: warning: method redefined; discarding old remove_column (snip) /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_view/helpers/prototype_helper.rb:873: warning:*’ interpreted as argument prefix
/usr/lib/ruby/gems/1.8/gems/actionmailer-1.2.3/lib/action_mailer/vendor/tmail/facade.rb:486:
warning: method redefined; discarding old create_reply
/usr/lib/ruby/gems/1.8/gems/actionwebservice-1.1.4/lib/action_web_service/protocol/xmlrpc_protocol.rb:6:
warning: discarding old message
/usr/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/initializer.rb:581: warning:
method redefined; discarding old []=

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