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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-build/netsurf-buildsystem-1.10::gentoo  39 KiB
[ebuild  N     ] x11-libs/xcb-util-0.4.1::gentoo  262 KiB
[ebuild  N     ] x11-libs/xcb-util-image-0.4.1::gentoo  283 KiB
[ebuild  N     ] dev-libs/libnsfb-0.2.2-r1:0/0.2.2::gentoo  USE="X -sdl -test -vnc -wayland" 81 KiB

Total: 4 packages (4 new), Size of downloads: 663 KiB