The same problem wasted me a couple hours.
You need to do the Configure again after you fixed the other problems.Then you can make it successfully.
I re-install (rpm) kernel-header and kernel-source to fix the /usr/include/linux problem on RedHat 6.2. Then Configure and make. I found that by erasing the directories and install all over again (from .tar.gz) can avoid problems arising in the middle of the process.