Help! I can't choose my network card in the kernel build options.

[Jason Majors <jason@whizzird.net>]

I'm trying to rebuild my kernel, and my network card does not come up as an
option.
The network card is an rtl8139.
I have the options for 3COM, AMD Lance, and WD cards, but the RealTek option is
grayed out.
I enabled TCP/IP networking.
The last box I had this card in had a vanilla kernel, so I just used the
included module.
Am I missing a required option? Is there a way for me to force it to create
the module?

Thanks,
Jason