Orange ~ # emerge -pv libX11

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

Calculating dependencies... done!
[ebuild  N    ] x11-proto/xf86bigfontproto-1.1.2  USE="-debug" 37 kB
[ebuild  N    ] x11-proto/xproto-7.0.7  USE="-debug" 131 kB
[ebuild  N    ] x11-proto/bigreqsproto-1.0.2  USE="-debug" 36 kB
[ebuild  N    ] x11-proto/xcmiscproto-1.1.2  USE="-debug" 36 kB
[ebuild     U ] x11-libs/libX11-1.0.3 [1.0.1-r1] USE="ipv6 -debug" 1,416 kB
[blocks B     ] >=x11-proto/xproto-7.0.6 (is blocking x11-libs/libX11-1.0.1-r1)

Total: 5 packages (1 upgrade, 4 new, 1 block), Size of downloads: 1,655 kB
Orange ~ # emerge -pv xproto

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

Calculating dependencies... done!
[ebuild  N    ] x11-proto/xproto-7.0.7  USE="-debug" 131 kB
[blocks B     ] >=x11-proto/xproto-7.0.6 (is blocking x11-libs/libX11-1.0.1-r1)

Total: 1 package (1 new, 1 block), Size of downloads: 131 kB
Orange ~ # emerge -Cp xproto

>>> These are the packages that would be unmerged:

--- Couldn't find 'xproto' to unmerge.

>>> No packages selected for removal by unmerge