[Click] Polling Drivers for e1000

[Latency Buster]

I get the following error while compiling the e1000 driver:
<error>
click:~/click/drivers/e1000-7.x/src> make
make -C /lib/modules/2.6.24.7_clickrouter-9-default/build
SUBDIRS=/home/click/click/drivers/e1000-7.x/src modules
make[1]: Entering directory `/usr/src/linux-2.6.24.7'
scripts/Makefile.build:46: *** CFLAGS was changed in
"/home/click/click/drivers/e1000-7.x/src/Makefile". Fix it to use
EXTRA_CFLAGS.  Stop.
make[1]: *** [_module_/home/click/click/drivers/e1000-7.x/src] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.24.7'
make: *** [default] Error 2
click:~/click/drivers/e1000-7.x/src>
</error>

How do I handle it please?