这是什么类型的屏蔽（masked）

poemsea

Calculating dependencies -
!!! All ebuilds that could satisfy ">=gnome-base/control-center-2.20.1" have been masked.
!!! One of the following masked packages is required to complete your request:
- gnome-base/control-center-2.20.1 (masked by: required EAPI 1, supported EAPI 0)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "gnome-base/gnome-2.20.1" [ebuild])

zhllg

你的portage比较旧，你至少需要2.1.3.12

*portage-2.1.3.12 (06 Oct 2007)

05 Oct 2007; Zac Medico <zmedico@gentoo.org> +portage-2.1.3.12.ebuild:
2.1.3.12 bump. This fixes bugs #88613, #142508, #174405, 174410,
#179380, #194095, #194169, #194398, #194764, and #194876. Bug #194041
tracks all bugs fixed since 2.1.3.9. This release is the first to have
support for EAPI-1 (#194876), which includes SLOT dependencies
(#174405), IUSE defaults (#174410), and ECONF_SOURCE support for the
default src_compile function (#179380). Package maintainers should
carefully consider the backward compatibility consequences before
defining EAPI="1" in any ebuilds, especially if other packages depend
on those ebuilds. See the ebuild(5) and emerge(1) manual pages for
EAPI related documentation.