Problem: After upgradind to kernel-souce-2.2.17-14 from the RedHat 
Network, module
   "EtherExpressPro/100 support (Intel driver)" (module e100)
wouldn't compile any more.

Cause: The cause is the missing of the necesary lines from from
   /usr/src/linux-2.2.17/drivers/drivers/net/Makefile

Solution: You can copy-paste the missing lines from the Makefile from the 
kernel-source-2.2.16 (included in distribution) or use the diff below:

651a652,655
> ifeq ($(CONFIG_E100),m)
>   M_OBJS += e100.o
> endif
> 
1414a1419,1420
> e100.o: e100.c e100.h
> 	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(INCLUDE) -DEXPORT_SYMTAB -c -o 
$*.o $<
! there is a tab and not spaces at the beginning of last line ! 

Note: the regular public (non RedHat) 2.2.18 kernel does not contain this 
module.