Deployment targets earlier than 4.3 require armv6 libraries to support all devices, which Apple no longer ships. One can build an armv6 slice using an older too

Deployment targets earlier than 4.3 require armv6 libraries to support all devices, which Apple no longer ships. One can build an armv6 slice using an older toolchain and lipo it with armv7/armv7s slices built against 7.0, but it's not clear if Apple will accept such binaries as App Store submissions.