Unable to build for iOS with Qt version 5.9.6 and XCode 10.0

With XCode 10.0 and Qt 5.9.6 my project file (pro) file is failed to be parsed by Qmake. Here is the error details:
 

Project ERROR: This mkspec requires Xcode 4.3 or later
09:54:56: The process "/Users/abehera/Qt/5.9.6/ios/bin/qmake" exited with code 3.
Error while building/deploying project IOSTest (kit: Qt 5.9.6 (ios))
When executing step "qmake"
 

If I comment out XCode version Check in default_pre.prf, then I my pro file is parsed but build fails. I also added a message to print XCode version and a test function in my .pro file. Attached are the screenshots and the test project.

Note: Qt 5.11.2 works fine with XCode 10.0. However, I need to use Qt 5.9.6 for my project to support minimum iOS version iOS 8.