Sample configuration files and web server configuration can be found in
${PREFIX}/share/examples/nagios.

Beware that Nagios might or might not work correctly on 64bit machines.

To start nagios automatically, add these lines to /etc/rc.local

if [ -x ${PREFIX}/sbin/nagios ]; then
	install -d -o _nagios /var/run/nagios
	echo -n ' nagios'; ${PREFIX}/sbin/nagios -d ${SYSCONFDIR}/nagios/nagios.cfg
fi
