Compile/link error for Clang compiler

Hello

Sorry. But I tried to search for similar error and cannot find any issues. Please forgive me if this is an error on my side.

The Qt Creator I have is 4.9.1
Based on Qt 5.12.3 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6), 64 bit)
Built on May 27 2019 00:16:48
From revision 168e91b618
OS: CentOS 7
I am following https://www.youtube.com/watch?v=Y1c-ieVO-UY
tutorial. Attach is my .pro, Makefile and build.log files.
Please let me know if you need more information.

The code compiles and runs fine using gcc version
4.8.5 20150623 (Red Hat 4.8.5-36)

RajFirstGUI.proMakefilebuild.log