I was unable to build the whole Mumble system on CentOS but it's available for Fedora Development. I just wanted the server part on my headless server, and a static build is available from the Mumble project on Sourceforge. So I grabbed the Mumble SRPM from Fedora Development, the static build from Sourceforge, and stripped the spec file down to the minimum needed to just install the static-build server. You'll find the result here:
http://sewingwitch.com/ken/Stuff/murmur-1.2.3-11.kp.src.rpm
If you're paranoid (a good admin should be), just unpack to use the spec file and grab the sources from Fedora Development and Sourceforge and overwrite those included in the SRPM before building.
I found a bug in the RPM: /etc/murmur needs to be owned by mumble-server.mumble-server so that it can write to its sqlite DB.
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Kenneth Porter