talanin-vm ~ # emerge dev-php/pecl-memcache

 * IMPORTANT: 8 news items need reading for repository 'gentoo'.
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Calculating dependencies /

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

!!! The ebuild selected to satisfy "dev-php/pecl-memcache" has unmet requirements.
- dev-php/pecl-memcache-2.2.6-r2::gentoo USE="session" ABI_X86="64" PHP_TARGETS="-php5-3"

  The following REQUIRED_USE flag constraints are unsatisfied:
    php_targets_php5-3

  The above constraints are a subset of the following complete expression:
    any-of ( php_targets_php5-3 )