I'm currently trying to get my wireless card to work with ndiswrapper after installing backtrack4 today, BUT....... When I try and use the make command it tells me that some or another file is missing. I've checked and the output is right, There is no file of that name but there is neither a folder of that name.

root@bt:/usr/src/ndiswrapper-1.56/ndiswrapper-1.56# make
make -C driver
make[1]: Entering directory `/usr/src/ndiswrapper-1.56/ndiswrapper-1.56/driver'
Makefile:34: *** Cannot find kernel version in /usr/src/linux, is it configured?.  Stop.
make[1]: Leaving directory `/usr/src/ndiswrapper-1.56/ndiswrapper-1.56/driver'
make: *** [all] Error 2
Should there be a folder in /usr/src/ called linux? I only have one called "/usr/src/linux-source-".

Any help would be much appreciated.