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

Calculating dependencies... done!
[ebuild   R   ] x11-libs/libwnck-2.18.2  USE="-debug -doc" 0 kB [1] 

Total: 1 package (1 reinstall), Size of downloads: 0 kB
Portage overlays:
 [1] /usr/local/layman/xeffects