Try to find these files on your disk using:
From this, you can edit c source code file by adding in the exact location of this file in the include statement.
Note: If you don't know how to do this and you have found the file on your filesystem, write back and I'll be more detailed.
Also, I did this when I was trying to get my DWL-120 working over the summer with Fedora Core 2 but even though it compiled and I was able to load the driver, the kernel would panic whenever the device tried to reset itself which made it useless. I reverted back to FC1 until I could get a direct network connection. It would work fine under FC1.
However, I am now on Fedora core 3 and am home again trying to get the DWL working. Please let me know if you can get it working and I'll keep you posted if I can or can't.
Hope this helps.