xgroove~ build question

Andrew Burgess's icon

I'm trying to build a pluggo version of a patcher that contains Thomas Grill's xgroove~ external, it's in a library format (3 objects in the lib) I can't figure out how to include it. if I add it to the build collective dialog, it doesn't work I get the 'no such object' message in the messages pane of pluggo

any ideas?