configure problem: fails sanity check

I'm trying to install fastcgi on my newly built Fedora Core 5 server.
I've been following along with directions from this site in order to install
ruby on rails:
http://www.digitalmediaminute.com/howto/fc4rails/

However, when I download and try to configure fastcgi, I get the message
that the sanity check fails on my C preprocessor.
Does anyone know what I'm doing wrong?
Are there dependencies that I'm unaware of?

This is the output:

[root@localhost fcgi-2.4.0]# ./configure
checking for a BSD compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for mawk... no
checking for gawk... gawk
checking whether make sets ${MAKE}... yes
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for executable suffix...
checking for object suffix... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking how to run the C preprocessor... /lib/cpp
configure: error: C preprocessor "/lib/cpp" fails sanity check
[root@localhost fcgi-2.4.0]#

Thanks for any help you can provide.
~Evan

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