Help me teach how to..

[Budi]

How to compile Golden dictionary on Windows when typed: qmake , it gives me:
QMAKESPEC has not been set, so configuration cannot be deduced
Error processing project file: D:/Portable/GoldenDictionary/goldendict/goldendict.pro

the needed path is correctly pointing to Qt 4.8.5 and mingw64, and that was on Golden dictionary source root dir. (don't care 'D:\Portable\GoldenDictionary' , it's just mine)