opencv framework could not run on ios5.0 (Bug #2509)

download the newest 2.4.3 framework for ios.
running a simple program with the framework with different ios version:

1) run on iPhone 5.0 or 5.1 simulator, error happens, beneath is the Xcode log:

dyld: lazy symbol binding failed: Symbol not found: _objc_setProperty_nonatomic
Referenced from: /Users/kechunlin/Library/Application Support/iPhone Simulator/5.0/Applications/BF32D890-97AD-42CF-B85E-4349F4CD4F41/FaceDetectVideo.app/FaceDetectVideo
Expected in: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/Foundation.framework/Foundation

dyld: Symbol not found: _objc_setProperty_nonatomic
Referenced from: /Users/kechunlin/Library/Application Support/iPhone Simulator/5.0/Applications/BF32D890-97AD-42CF-B85E-4349F4CD4F41/FaceDetectVideo.app/FaceDetectVideo
Expected in: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/Foundation.framework/Foundation

2) run on device of iPhone5.0, the same error happens as on simulator above

3) run on ios 6.0 both on simulator and device, the program works well.

Additionally, the same phenomenon happens with last version - opencv 2.4.2 for ios.
So it seems opencv framework only support ios6 but not support ios5.

Hope ios5 is also be supported.