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

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

[ebuild  N     ] xfce-base/libxfce4util-4.21.0:0/7::gentoo  USE="-introspection -vala" 113 KiB
[ebuild  N     ] xfce-base/xfconf-4.20.0:0/3::gentoo  USE="-debug -introspection -vala" 746 KiB

Total: 2 packages (2 new), Size of downloads: 858 KiB