I am a linux programmer and new to GUI programming on windows, spare my ignorance.
I downloaded the Qt-x64- x64 4.8.6 version compiled under MingW sjlj.

I didn't downloaded the compiler, but 7zip version. I already have a working GCC-TDM (4.8) installation.

QMAKESPEC is set to C:\qt-4.8.6-x64-mingw-sjlj\mkspecs\win32-g++

Both normal terminal and msys gives the following error:
JLIM1Ce.jpg

How to solve this riddle?