Compiling The Linux Kernel

You need to have your kernel source tree configured properly, matching your running kernel.
You don't have to actually compile the kernel source tree in this case.
Sometimes the driver has a script that will compile the driver for you, hiding the actual compilation process.
If it thinks your kernel sources are under /lib/modules/2.4.20-8/build, this is ok - this should be a symbolic link pointing to the right location of the sources....
... But it does not hurt to make sure.
Otherwise, read the driver's installation instructions, and follow them carefully.

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