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Currently known issue, and solution, on building with QtCreator 3.4.0 based on Qt 5.4.1 on Windows 8 64-bit with Avira AntiVirus Pro version (as of June 11 2015): Build fails with 'file previously exists' errors when writing build files to destination directory. Problem is based on Avira scanning each file causing delay, Qt retries writing the file and generates the error. Other versions of Qt Creator and Avira may exhibit similar behavior. Set Avira Real-Time Protection to 'off' before building.