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

Calculating dependencies ... done!
Dependency resolution took 1.06 s (backtrack: 0/20).

[ebuild  N     ] x11-libs/libXcursor-1.2.3::gentoo  USE="-doc" 286 KiB
[ebuild  N     ] x11-libs/libXinerama-1.1.6::gentoo  USE="-doc" 263 KiB
[ebuild  N     ] x11-libs/fltk-1.4.5:1/1.4::gentoo  USE="X cairo dbus opengl (static-libs) -doc -examples -test -wayland" 8267 KiB
[ebuild  N     ] x11-misc/xdiskusage-1.52-r1::gentoo  54 KiB

Total: 4 packages (4 new), Size of downloads: 8868 KiB