My Acer Aspire 5315 has Athero wireless, I followed the instruction here:

UserDocs/FirstTimeHowTo - madwifi.org - Trac

But when I do "make", I got:

Makefile.inc:91: *** KERNELCONF: /lib/modules/2.6.25.9-0.2-pae/build/.config does not exist.. Stop.

Is it because I do not have kernel source files installed or other reasons?

Thanks!