Kernel Modules programming for 2.4

[Themis]

Prospatho na ftiaxo merika test modules kai na ta fortoso sto sistima
ostoso sinanto kapoia problimata. Katarxin grafo ena aplo programmataki
pou apla tiponei to hello world. Eno pernaie apo compile (einai sosto
giati to pira apo biblio) otan prospatho na to fortoso insmod ./hello.o
perno ena minima pou leei:
hello.o: kernel-module version mismatch
        hello.o was compiled for kernel version 2.4.20
        while this kernel is version 2.4.22-1.2115.nptl.
Any ideas? Xrisimopoio gcc 3.3.2 kai Fedora Core 1 me ton pirina pou
erxetai mazi kai einai aftos tis teleftaias grammis tou error msg.

Themis