For more information, see MASKED PACKAGES section in the emerge man
page or refer to the Gentoo Handbook.

 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

  (dev-qt/qtchooser-66-r2:0/0::gentoo, binary scheduled for merge) pulled in by
    >=dev-qt/qtchooser-66-r1 required by (dev-qt/qtcore-5.15.2-r14:5/5.15.2::gentoo, installed) USE="icu -debug -old-kernel (-systemd) -test" ABI_X86="(64)"

For more information about Blocked Packages, please refer to the following
section of the Gentoo Linux x86 Handbook (architecture is irrelevant):

https://wiki.gentoo.org/wiki/Handbook:X86/Working/Portage#Blocked_packages
 * Выполнение Emerge завершилось с ошибкой
 * Не удалось обновить



 # eix qtchooser
[U] dev-qt/qtchooser
     Доступные версии:      *66-r1^t{tbz2} 66-r2^t {test}
     Установленные версии:  66-r1^t{tbz2}(14:52:08 01.10.2021)(-test)
     Домашняя страница:     https://code.qt.io/cgit/qtsdk/qtchooser.git/
     Описание:              Tool to quickly switch between multiple Qt installations