10:24:58 jesse@chino:~ ruby-1.9.3-p327
$> ruby -rbson -e 'puts BSON::ObjectId.new.generation_time.zone'
**Notice: C extension not loaded. This is required for optimum MongoDB Ruby driv
You can install the extension as follows:
gem install bson_ext
If you continue to receive this message after installing, make sure that the
bson_ext gem is in your load path and that the bson_ext and mongo gems are of
the same version.