[CentOS] recompiling kernel results in error: .../linux-2.6.18.i686/arch//Makefile: No such file or directory

Mon May 21 00:52:57 UTC 2007
dcw <dwoody1 at charter.net>

I have installed CentOS 5 with all updates. Also I have 2 ne2000 isa cards.

In recompiling the kernel, I have been trying to follow the instructions on this URL:
	http://wiki.centos.org/HowTos/Custom_Kernel

The complete error message I get is:
Makefile:403: /home/cs/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i686/arch//Makefile: No such file or directory

I have the following kernel and rpm packages installed:
kernel-2.6.18-8.1.4.el5
kernel-headers-2.6.18-8.1.4.el5
kernel-devel-2.6.18-8.1.4.el5
rpm-devel-4.4.2-37.el5
rpm-4.4.2-37.el5
rpm-python-4.4.2-37.el5
redhat-rpm-config-8.0.45-17.el5.centos
rpm-build-4.4.2-37.el5
rpm-libs-4.4.2-37.el5

uname -r gives 2.6.18-8.1.4.el5

The .rpmmacros file has the following:
%_topdir /home/cs/redhat
%packager cs <dwoody1 at charter.net>

The script I am using from a user login is:

rpm -i /home/packages/kernel-2.6.18-8.1.4.el5.src.rpm
rpmbuild -bp --target=`uname -m`  kernel-2.6.spec
cd /home/cs/redhat/BUILD/kernel-2.6.18/linux-2.6.18.`uname -m`
cp /home/cs/redhat/SOURCES/kernel-2.6.18-`uname -m`.config .config
# enter 'y' for isapnp, isa and 'm' for ne2000 support
make xconfig
cp .config /home/cs/redhat/SOURCES/kernel-2.6.18-`uname -m`.config
cd /home/cs/redhat/SPECS
# change the release to:
# %define release 8.1.4.1.ne2000%{?dist}
vi kernel-2.6.spec
cd /home/cs/redhat/SPECS
rpmbuild -ba --target=`uname -m` kernel-2.6.spec

After the patches are applied during the last rpmbuild command I get the
error message at the top of this email.

Searching the web has not provided any useful information.

According to the documentation in make xconfig, isa and isapnp support
have to be compiled into the kernel.

I know that I have either not set a parameter, doing commands in the wrong
order or I have missed a step, but I have not been able to determine what.

I have even tried to change the order of the commands without luck.

Any help will be greatly appreciated,

David