Sadly installing postgresql and postgis is not as straighforward as it could be on centos 6.X as the latest stable verisons of postgresql and its various extensions are not in any of the default repositories.
VM EnvironmentFor reference, I’m using an ESXI host and and a vanilla Centos6.4 64bit client. The client was installed from the minimal image (CentOS-6.4-x86_64-minimal.iso).