localhost ~ # emerge -p xorg-x11

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

Calculating dependencies /
!!! All ebuilds that could satisfy ">=x11-base/xorg-server-1.0.99" have been masked.
!!! One of the following masked packages is required to complete your request:
- x11-base/xorg-server-1.1.99.2_p20060620-r1 (masked by: package.mask, package.mask, missing keyword)
# Joshua Baergen <joshuabaergen@gentoo.org> (03 Jun 2006)
# X.Org development snapshots

- x11-base/xorg-server-1.1.0-r1 (masked by: package.mask)
- x11-base/xorg-server-1.1.99.2_p20060620 (masked by: package.mask, package.mask, missing keyword)
- x11-base/xorg-server-1.0.99.902_p20060508 (masked by: package.mask, missing keyword)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "x11-drivers/xf86-input-spaceorb-1.1.0" [ebuild])