установка программ

Calculate Русский
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Добрый день!

Установил Calculate linux
подскажите как в ней правильно размаскировать пакет мануалы вообще не понятные.

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emerge www-client/firefox

 * IMPORTANT: 23 news items need reading for repository 'gentoo'.
 * Use eselect news to read news items.

Calculating dependencies... done!

!!! All ebuilds that could satisfy "www-client/firefox" have been masked.
!!! One of the following masked packages is required to complete your request:
- www-client/firefox-50.1.0::gentoo (masked by: EAPI 6)
- www-client/firefox-45.6.0::gentoo (masked by: EAPI 6)
- www-client/firefox-45.5.1::gentoo (masked by: EAPI 6)
- www-client/firefox-45.5.0::gentoo (masked by: EAPI 6)
- www-client/firefox-45.4.0::gentoo (masked by: EAPI 6)

The current version of portage supports EAPI '5'. You must upgrade to a
newer version of portage before EAPI masked packages can be installed.
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.
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Обновите портежи после установки и выполните обновление:

cl-update