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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] media-libs/giflib-6.1.3:0/7::gentoo  USE="-doc -static-libs" 460 KiB
[ebuild  N     ] mail-filter/spamprobe-1.4d-r3::gentoo  USE="gif jpeg png -berkdb" 257 KiB

Total: 2 packages (2 new), Size of downloads: 717 KiB