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

Calculating dependencies ... done!
Dependency resolution took 1.61 s (backtrack: 0/20).

[ebuild  NS    ] app-text/docbook-xml-dtd-4.3-r2:4.3::gentoo [4.1.2-r7:4.1.2::gentoo, 4.2-r3:4.2::gentoo, 4.4-r3:4.4::gentoo, 4.5-r2:4.5::gentoo] 82 KiB
[ebuild  N     ] dev-libs/json-glib-1.10.8::gentoo  USE="nls -gtk-doc -introspection -test" 1264 KiB
[ebuild  N     ] x11-libs/gdk-pixbuf-2.44.8:2::gentoo  USE="gif jpeg tiff -gtk-doc -introspection -test" 5897 KiB
[ebuild  N     ] dev-libs/appstream-glib-0.8.3:0/8::gentoo  USE="-fonts -gtk-doc -introspection" 2268 KiB

Total: 4 packages (3 new, 1 in new slot), Size of downloads: 9510 KiB