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

Calculating dependencies ... done!
Dependency resolution took 1.68 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     ] x11-libs/libXcomposite-0.4.7::gentoo  USE="-doc" 267 KiB
[ebuild  N     ] x11-libs/libXdamage-1.1.7::gentoo  260 KiB
[ebuild  N     ] x11-libs/gdk-pixbuf-2.44.8:2::gentoo  USE="gif jpeg tiff -gtk-doc -introspection -test" 5897 KiB
[ebuild  N     ] media-libs/cogl-1.22.8-r3:1.0/20::gentoo  USE="kms opengl pango -debug -examples -gles2 (-gstreamer) -introspection -wayland" 1702 KiB

Total: 5 packages (4 new, 1 in new slot), Size of downloads: 8206 KiB