[root@fedora ndiswrapper-1.42]# make install
make -C driver install
make[1]: Entering directory `/root/ndiswrapper-1.42/driver'
Can't find kernel build files in /lib/modules/2.6.18-1.2798.fc6/build;
  give the path to kernel build directory with
  KBUILD=<path> argument to make
make[1]: *** [prereq_check] Error 1
make[1]: Leaving directory `/root/ndiswrapper-1.42/driver'
make: *** [install] Error 2
[root@fedora ndiswrapper-1.42]#