The files in drivers/net/pcmcia are skipped when configured to compile as
modules. Here's a patch (against test13-pre4) for the Makefile:
--- linux.old/drivers/net/Makefile Thu Dec 21 22:14:46 2000
+++ linux/drivers/net/Makefile Thu Dec 21 23:38:20 2000
@@ -8,7 +8,7 @@
obj-n :=
obj- :=
-mod-subdirs := wan
+mod-subdirs := pcmcia wan
O_TARGET := net.o