are you sure you have kernel sources instaled in /usr/src/linux?
can you post the error message - exactly
- from the make script?
the modules are installed corrected in /lib/modules/$YOUR_KERNEL?
how this makefile looks like? sorry, i have no experience with this module.
maybe some grep will help
grep -i src Makefile
grep -i kernel Makefile
grep -i modules Makefile