Recently, Nagios released its latest versions Nagios 4.0.1 on 15th October 2013, and its latest stable release of Nagios plugins 1.5.
This article is intended to guide you with easy instructions on how to install latest Nagios 4.0.1 from source (tarball) on RHEL 6.4/6.3/6.2/6.1/6/5.8, CentOS 6.4/6.3/6.2/6.1/6/5.8 and Fedora 19,18,17,16,15,14,13,12 distributions.