From Sylvain Marie, When compiling OSG for the iOS simulator, providing both -miphoneos-version-min and -mios-simulator-version-min doesn’t please clang (tested on OS X 10.9.0 with Xcode 5.0.1).
Here is a small change (against commit da597ab16945c572a2ad2f4f26fcef38ed21b074) in the CMakeLists.txt to avoid this situation.