emerge -pv apache

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

Calculating dependencies... done!
[ebuild  N    ] app-admin/apache-tools-2.2.6  USE="ssl" 0 kB
[ebuild  N    ] www-servers/apache-2.2.6-r2  USE="ldap ssl -debug -doc -mpm-event -mpm-itk -mpm-peruser -mpm-prefork -mpm-worker -no-suexec (-selinux) -static-modules -threads" 0 kB

Total: 2 packages (2 new), Size of downloads: 0 kB