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Packed project libraries are new with LV 2010 and seem to be a great way to share code. One idea to make them more user friendly for the end user of the library would be something that would give the project library developer the ability to specify driver dependencies for their library.
If the end user of the library did not have the right drivers installed, they would receive a warning or maybe a broken run arrow if they tried to use it. The warning could be very descriptive by telling them exactly what drivers they are missing. This seems like a better solution that just getting all these arbitrary errors because LabVIEW can't find subvis called by the packed project library.
Here's a mockup of what the window for this might look like in the packed project library build specifications (borrowed from the additional installers window).