Support forum for Nagios Core, Nagios Plugins, NCPA, NRPE, NSCA, NDOUtils and more. Engage with the community of users including those using the open source solutions.
I can assure you... that this is not the official installation process .
You need to untar the nagios-plugins-x.x.xx package somewhere (preferably /tmp) and then follow the instructions in the readme to compile and install the plugins. It's pretty simple, you just need to run the usual ./configure, make, make install