Developing an openFrameworks app with AppCode is pretty easy. However, if you just open and run the project created by the project generator, you might see the following errors:

Why doesn’t it just work?
This is because openFrameworks doesn’t support 64 bit builds yet on the Mac, due to a dependency on the deprecated QT framework. More on that here.
What’s the quick fix?
Set your project’s architecture to i386 (32 bit) in it’s build settings:
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Once you’ve done this, your run configurations should shortly say 32 bit Intel instead of 64 bit Intel:

Kudos! Run your project now, and it will work right out of the box!