Er, what the heck is this one:
emerge -av1 x11-libs/libXScrnSaver
These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild N ] x11-proto/scrnsaverproto-1.2.0 49 kB
[ebuild N ] x11-libs/libXScrnSaver-1.1.3 USE="-debug" 0 kB
[blocks B ] <x11-libs/libXScrnSaver-1.2
("<x11-libs/libXScrnSaver-1.2" is blocking x11-proto/scrnsaverproto-1.2.0)
Total: 2 packages (2 new), Size of downloads: 49 kB
Conflict: 1 block (1 unsatisfied)
* Error: The above package list contains packages which cannot be
* installed at the same time on the same system.
('ebuild', '/', 'x11-libs/libXScrnSaver-1.1.3', 'merge') pulled in by
x11-libs/libXScrnSaver
