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usb_set_configurationreturns-1. However I don't know if that'sLIBUSB_ERROR_BUSYor something else, because that symbol is undeclared. I also triedUSB_ERROR_BUSY, undeclared as well. I also didn't find either in any*.hfile on my whole system.usb_set_configurationis declared in/usr/include/usb.hbut I don't see any error code defined there.-1) after blacklisting ds2490 and rebooting.libusbavailable, and each has its corresponding development package:libusb-1.0-0-devforlibusb-1.0-0andlibusb-devforlibusb-0.1-4. The respective.hfiles are at/usr/include/libusb-1.0/libusb.hand/usr/include/usb.h, but only if the development packages are installed.