rbx TZ issue with bson

mri-bson

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
er performance.
  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.

UTC

rbx-bson

10:25:20 jesse@chino:~  rbx-head
$> ruby -rbson -e 'puts BSON::ObjectId.new.generation_time.zone'

**Notice: C extension not loaded. This is required for optimum MongoDB Ruby driv
er performance.
  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.

GMT