Using libusb-1.0 with Qt (MinGW) in Windows 8

[anda_skoa]

The LIBS variable is usually an -L directive with the directory the library is in and an -l directive with the library name (without any extension of lib prefix)

So maybe try

LIBS += -L C:\Qt\libusb-1.0.20\MinGW32\static -l usb-1.0

LIBS += -L C:\Qt\libusb-1.0.20\MinGW32\static -l usb-1.0

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Cheers,
_