These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] acct-group/nagios-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/nagios-0-r3::gentoo  0 KiB
[ebuild  N     ] net-analyzer/monitoring-plugins-2.4.0-r1::gentoo  USE="ipv6 ssh ssl -curl -dns -fping -game -gnutls -ldap -mysql -postgres -radius -samba -snmp" 2683 KiB

Total: 3 packages (3 new), Size of downloads: 2683 KiB