talanin-vm ~ # emerge dev-php/pecl-memcache
--- Invalid atom in /etc/portage/package.mask: ;>=dev-php/pecl-memcache-2.2.7

 * IMPORTANT: 8 news items need reading for repository 'gentoo'.
 * Use eselect news to read news items.

Calculating dependencies \

!!! Problem resolving dependencies for dev-php/pecl-memcache                                                                                                                                                                               ... done!

!!! All ebuilds that could satisfy "dev-lang/php:5.5" have been masked.
!!! One of the following masked packages is required to complete your request:
- dev-lang/php-5.5.19::gentoo (masked by: package.mask, ~amd64 keyword)
- dev-lang/php-5.5.18::gentoo (masked by: package.mask)

(dependency required by "dev-php/pecl-memcache-3.0.8[php_targets_php5-5]" [ebuild])
(dependency required by "dev-php/pecl-memcache" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.