Trying to install ALSA drivers...installed the source kernal package, then ran ./configure

checking for kernal version...expr: syntax error
expr: syntax error
expr: syntax error
failed (probably missing /usr/src/linux/include/linux/version.h)

I can see it if i check...so read somewhere that need to link to it so i

ln -s /usr/src/linux-2.4.18mdk /usr/src/linux

Ran ./configure again and still came up same....I am totally clueless...Anyone have any ideas of what i should do??? -thanks

EDIT: Ok, i noticed in the /usr/src/linux folder somehow the drivers were copied there.....And it worked from there....Why would it work from there and not from the /tmp directory where i downloaded them?? And how in the heck did they get there?? -thanks