But more importantly, I've got a repository for CentOS 7 now where i ported all of this over to as well as added SELinux support (backported to CentOS 6 too).
Feel free to link to my yum repository (information here) if you want. I provide the src.rpm files there too if you don't trust that random stranger on the internet type thing. My blog explains how to build it yourself anyway; it's a little customized, but in a good way (directory structures, and default configuration).
Anyway, I love Nagios, and mostly just lurk here. But i figured i should give back if i can. Do what you want with this info; hopefully it will help some people out.