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

Calculating dependencies ... done!
Dependency resolution took 1.07 s (backtrack: 0/20).

[ebuild  N     ] sys-boot/gnu-efi-4.0.4::gentoo  USE="(-custom-cflags)" 240 KiB
[ebuild  N     ] app-crypt/sbsigntools-0.9.5::gentoo  168 KiB

Total: 2 packages (2 new), Size of downloads: 408 KiB