Unable to locate compiler in your current path

I am trying to install the real port drivers on centos 6.3 and I am getting an error when running ./compile.
It says it is unable to find a compilier in my current path. I am not sure exactly what this is looking for.

I also get the same if i try and do an rpmbuild on the source rpm file. Any help would be greatly appreciated.

You might want to have a look at the package dependencies: http://www.digi.com/support/kbase/kbaseresultdetl?id=377