A very common question here on the forums. You need to install the kernel source if you are building ndiswrapper. Fedora does not install the kernel source during the install. Why I do not know. Its been that way even before when it was Redhat. At any point if it is still the orginal installed cd then on the install disc is a file called kernel-devel-*****.rpm and maybe kernel-headers-*****.rpm. You need to install them or at least the kernel-devel rpm. To do that as root goto the location of the rpm on the install disc and run this command.
rpm -ivh kernel-devel*.rpm
Do the same if the headers file exist.
Now you can build ndiswrapper.
Also don't double post.