Mandrake 9.2 kernel source (warning: newbie doubt)

[Hans Raj]

hi,
   I'm using Mndrk 9.2 on my PC (kernel: 2.4.22-10mdk). How do I install the
Kernel source headers?
   Tried to install a modem driver (a wee Dicksmith one) downloaded off the net,
and while doing a "make", it complained that kernel source headers could not be
found. I searched in the packages list for "kernel source" and found just
documentation bits.
   Any suggestions?
Thanks,
Hans