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 ?

Answered my own question, but in case anyone is curious:

  • renaming /usr/lib/ to anything else causes
    script/console to complain like so:


!!! The bundled mysql.rb driver has been removed from Rails 2.2.
Please install the mysql gem and try again: gem install mysql.
LoadError: cannot open shared object file: No
such file or directory - /usr/lib/ruby/1.8/i486-linux/
from /usr/lib/ruby/1.8/i486-linux/
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:inrequire’