Xcode ARC (automatic reference counting), “release is unavailable”

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The two options given by NJones are valid and effective ways of dealing with ARC incompatibility. However, you do have a third option. Disabling ARC for specific files.

Giving the flags -fno-objc-arc to your non ARC compatible compile sources affectively marks them as such upon compilation.

You can find your compile sources under Targets → Your App → Build Phases → Compile Sources.

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