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Common issues you may encounter and their solutions.

NSConcreteStackBlock

Your application fails to launch, and you see a crash message that looks something like

Dyld Error Message: Symbol not found: **NSConcreteStackBlock

This seems to be an issue with LLVM, and blocks in general. It seems to affect those using Xcode 3, and targeting either Mac OS X 10.5 or iOS 3.X, and perhaps using the LLVM compiler.

A solution was posted to StackOverflow, and states that you should specify the linker flag

-weak_library /usr/lib/libSystem.B.dylib

This was also reported in Issue #10 (concerning Mac OS X 10.5), and the linker flag was reported to work.

Xcode 4.4 or later required

Problem: Your application fails to build because of the Xcode modern syntax @{} for dictionaries ...

Cause: This is because Xcode 4.4 or later is required to process this.

Solution: Upgrade to the latest Xcode version.

Mac OS X 10.6 solution: If you still need to support Mac OS X 10.6, please use an older version of Lumberjack that can be built using an older Xcode