Hi @math_priyanka,
Sorry, I’ve been traveling (back from the MRtrix workshop!).
First thought is that the settings detected in your last post are clearly quite different from those you had in your first post – I suspect that last run took place in a clean shell as I’d suggested?
In your initial post, it was trying to use the anaconda compiler (which rarely works for compiling MRtrix) and Qt 5.15.6 (presumably also provided through anaconda). Now it’s trying to use the default compiler and Qt library that ship with Ubuntu 16.04: g++ 5.5.0 and Qt 5.5. Normally I would say these are too old, but it looks to me like ./configure ran through without any errors? Have you tried running ./build yet? I have a feeling it ought to work now…
All the best,
Donald