IDA Pro debugging on OS X

Is there some trick to getting debugging working on OS X with IDA? I’ve tried a number of different approaches, and a number of different apps, but no matter what I do, either I get SIGNINTs or SIGSEGVs or something similar. Depending on the app, either libsystem_secinit or libsystem_kernel seems to be the cause. I presume this is some OS X defensive measure against debugging running apps, but there must be some way around it?

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