I'm trying to teach myself to write externals in C. I've found a few tutorials but they are a bit older:

The Cycling 74 documentation also appears to be out of date if I'm reading it correctly. None of the examples in the SDK really match the code in the included HTML docs, and Xcode has changed enough that most of the steps in the above tutorials don't apply. (This is on top of the fact that none of the example projects will open in Xcode 5 anyway, so I've rolled back to Xcode 4).

Is there an up-to-date tutorial around, or will it be a matter of interpreting older style tutorials in addition to trial and error?

Appreciate your insights!