problem with mysql gem

Hi. Whenever I use activerecord I get this error NameError:
uninitialized constant Mysql. I installed the mysql 2.7 gem and I'm on
Rails 1.1.6 / Ruby 1.8.4. The gem was built successfully using 'gem
install -- --with-mysql-config=/usr/local/mysql/bin/mysql_config'.

Here's a sample trace of the error in 'script/console':

User.find 1

NameError: uninitialized constant Mysql
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in
`const_missing'
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:133:in
`const_missing'
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/mysql_adapter.rb:34:in
`mysql_connection'
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:251:in
`connection_without_query_cache='
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/query_cache.rb:54:in
`connection='
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:220:in
`retrieve_connection'
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/connection_adapters/abstract/connection_specification.rb:78:in
`connection'
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:764:in
`sanitize'
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:950:in
`find_one'
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:941:in
`find_from_ids'
        from
/usr/local/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:382:in
`find'
        from (irb):3

This is on Centos 4.3, and I've tried rebooting just as some posts
suggested.