compiling rtl-sdr on win10 with qtcreator

hello, I'm trying to build rtl-sdr on win10. I choosed to use mingw and qtcreator. I installed: cmake 3.7.1 qtcreate 4.2.0 mingw32 (to build libusb) I compiled libusb with mingw32 and automake and installed in Desktop\libusb\. Now I'm trying to find out how to generate make files for rtl-sdr passing the folder where I installed libusb (library and header) in qtcreator. I don't understand if I have to modify CMakeLists.txt or there is some gui to enter the correct parameter. I have even to find out if I have to explicit the variable LIBUSB_PKG_INCLUDE_DIRS or what... running cmake (from qtcreator) returns with error that I'm missing libusb and libpthread. I think that once I can solve the problem for libusb I will be able to solve even the one of libpthread. can someone help me in this phase? thanks Luigi