i tried to install the new driver for my WUSB54GC and followed tutorials from the forum.

but when i tried to run make command i got the following error

Code:
make: *** /lib/modules/2.6.21.5/build: No such file or directory.  Stop.
rt73.ko failed to build!
make: *** [module] Error 1
what am i doing wrong? is the installation package corrupted or sumthg..?