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Re:Poll: Which iOS version do you require? by natesm on Tuesday July 19, 2011 @04:41PM (#2782979)
Blocks.

Although I'm not sure what would happen if you compiled the appropriate parts of http://compiler-rt.llvm.org/ into a 3.x application.

Re:Poll: Which iOS version do you require? by frankus on Tuesday July 19, 2011 @08:38PM (#2783761)
You can use a project called PLBlocks. I've successfully submitted to the App Store with it.