The build installs Nagios to /usr/nagios. It should be installed to /usr/local/nagios. Reproducible: Always Steps to Reproduce: 1. emerge nagios Actual Results: Nagios installed into /usr/nagios directory. Expected Results: Nagios should be installed to /usr/local/nagios
No. /usr/local/ isn't where the distribution installs things. That's for "local" stuff.