Qt 5.8 OSX - compile error

[vino1992]

I installed Qt 5.8 on my Mac running OSX El Capitan 10.11.6. When I try to compile a project coded with Qt 5.5, it throws the following error;

:-1: error: no such file or directory: '5.8/5.8/clang_64/lib'

:-1: error: no such file or directory: '5.8/5.8/clang_64/lib'

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I then presumed it may be due to version differences and hence tried tried compiling new simple project from scratch; this too resulted in the same error.
As the error suggests; I checked for the directory

'5.8/5.8/clang_64/lib'

but could not locate it. Instead I found

'5.8/clang_64/lib'

. So I added a

5.8

folder and moved all contents to the new folder such that the required Qt directory exists. But this results in the error;

locate the qmake file at '5.8/clang_64/lib'

Please help. Thank you.