[CentOS] dkim-milter-2.7.2 and Centos 5.2

I am trying to install dkim-milter-2.7.2 on a Centos 5.2 system and keep
getting the following errors.

I have very little experience in C programing so I am at a loss as how to proceed.
I have sendmail-devel installed

Here is the tail of the result output of 

sh ./Build


make[2]: cc: Command not found
make[2]: *** [assert.o] Error 127
make[2]: Leaving directory
`/etc/mail/dkim/dkim-milter-2.7.2/obj.Linux.2.6.18-92.1.22.el5xen.i686/libsm'
make[1]: ***
[/etc/mail/dkim/dkim-milter-2.7.2/obj.Linux.2.6.18-92.1.22.el5xen.i686/libsm/libsm.a] Error 2
make[1]: Leaving directory
`/etc/mail/dkim/dkim-milter-2.7.2/obj.Linux.2.6.18-92.1.22.el5xen.i686/dkim-filter'
make: *** [all] Error 2


Any ideas?

Greg Ennis