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

Calculating dependencies  . .. ... done!
[ebuild  NS   ] app-text/docbook-xml-dtd-4.3-r1 [4.5-r1] 0 kB
[ebuild  N    ] app-text/rarian-0.8.1-r1  USE="-debug" 0 kB
[ebuild  NS   ] app-text/docbook-xml-dtd-4.4-r2 [4.5-r1] 0 kB
[ebuild  N    ] app-text/gnome-doc-utils-0.20.1  USE="-debug" 0 kB
[ebuild     U ] dev-util/gtk-doc-am-1.15 [1.11] 0 kB
[ebuild  N    ] app-text/scrollkeeper-9999-r1  0 kB
[ebuild  N    ] dev-util/gtk-doc-1.15  USE="-debug -doc -emacs -test" 0 kB

Total: 7 packages (1 upgrade, 4 new, 2 in new slots), Size of downloads: 0 kB

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

Calculating dependencies  ... done!
[ebuild  NS   ] app-text/docbook-xml-dtd-4.3-r1 [4.5-r1] 0 kB
[ebuild     U ] dev-util/gtk-doc-am-1.15 [1.11] 0 kB

Total: 2 packages (1 upgrade, 1 in new slot), Size of downloads: 0 kB

There was an additional notice not logged about Adobe-flash being masked for both items