Does "c:\Qt\4.8.6\x64\mingw-sjlj\include" directory exist and does it contain a "QtGui" subdirectory with a "QApplication" file?
Does "c:\Qt\4.8.6\x64\mingw-sjlj\include" directory exist and does it contain a "QtGui" subdirectory with a "QApplication" file?
Seems strange. You set QMAKESPEC to C:\qt-4.8.6-x64-mingw-sjlj\mkspecs\win32-g++ but the include files were in a totally different subtree of C (C:\Qt\4.8.6\...) ? Seems someone.... extraordinary.
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