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Xcode linker and blocks: Undefined symbol "___block_global_1"

I am trying to build an application in Xcode 3.2.4 and am getting the following linker error: Undefined symbols: "___block_global_1", referenced from: ___block_holder_tmp_1.120 in foobarbaz.o ld: symbol(s) not found collect2: ld returned 1 exit status I'm at a loss to explain what I've done in my source file that might be caus...