Comment 2 for bug 646419

The run of the LTP test suite had dozens of failures related to message queues. The failures were traced back to this option not being enabled.
I don't have a specific example of code that is failing due to this option being disabled, but it is part of the posix standard and could be used by end users. It will be more difficult to enable later. However, this is not a show-stopper and it ok if you want to wait till later to enable it.