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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] x11-libs/libXcursor-1.2.3::gentoo  USE="-doc" 286 KiB
[ebuild  N     ] x11-libs/xcb-util-0.4.1::gentoo  262 KiB
[ebuild  N     ] x11-libs/xcb-util-wm-0.4.2::gentoo  279 KiB
[ebuild  N     ] x11-misc/dmenu-5.4::gentoo  USE="-savedconfig -xinerama" 17 KiB
[ebuild  N     ] x11-wm/spectrwm-3.5.1::gentoo  192 KiB

Total: 5 packages (5 new), Size of downloads: 1034 KiB