question for OP
What's the guitar? Is the intent to glue the break in place? One trick I've seen (a luthier's watch-this on a guitar I bought to repair) was to put glue on a feeler gauge and insert the tool as deep into the crack as possible. Inject glue with a syringe, maybe. Pallet knife, too. Whatever can get the glue into the crack.
If OP can get the guitar for peanuts, I don't see a downside. Ten minutes, some glue, clamp it up and check in the morning.
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