Well, this thread is from 2009! And for a webcam driver.
Which openSUSE version are you using?
At least on 12.3 the rt2800usb driver is already included, so no need to install anything.
And what’s Backtrack 5? :\
For “make prepare” to work you need to install the package “kernel-source”.
But normally “make prepare && make modules_prepare” shouldn’t be needed anymore AFAIK. Just install “kernel-desktop-devel” (provided you’re using kernel-desktop) and you should be able to compile kernel modules.