If you get errors during the make, you needn't bother trying to make install. It won't work. Posting the errors would be more helpful.
Do you have the kernel source and headers installed so that you can compile source packages? If not, again, it won't work.
Your posting sig indicates RH 9. If so, you might try the rpms for the wlan_ng package
Finally, I suggest using the orinoco driver with Prism wireless devices rather than wlan_ng. It's probably already loaded on your system.