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

Calculating dependencies ... done!
Dependency resolution took 1.13 s (backtrack: 0/20).

[ebuild  N     ] acct-group/clamav-0-r3::gentoo  0 KiB
[ebuild  N     ] dev-libs/check-0.15.2-r2::gentoo  USE="-doc -subunit -test" 299 KiB
[ebuild  N     ] acct-user/clamav-0-r3::gentoo  0 KiB
[ebuild  N     ] app-antivirus/clamav-1.5.3:0/sts::gentoo  USE="clamapp system-mspack -clamonacc -debug -doc -experimental -libclamav-only -milter -rar (-selinux) (-systemd) -test" 32015 KiB

Total: 4 packages (4 new), Size of downloads: 32314 KiB