Rails - Jan 2009 - how-to verify rails is using mysql gem instead of whatever "-d mysql" provides

How does one verify that a Rails project is using the mysql gem (which
I assume is
faster) instead of whatever "-d mysql" provides ?
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Answered my own question, but in case anyone is curious:
- renaming /usr/lib/libmysqlclient.so.15.0.0 to anything else causes
script/console to complain like so:
>> Budgie.find(:all)
!!! The bundled mysql.rb driver has been removed from Rails 2.2.
Please install the mysql gem and try again: gem install mysql.
LoadError: libmysqlclient.so.15: cannot open shared object file: No
such file or directory - /usr/lib/ruby/1.8/i486-linux/mysql.so
	from /usr/lib/ruby/1.8/i486-linux/mysql.so
	from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require''
	from /usr/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/
active_support/dependencies.rb:153:in `require''

peace
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