Multiple versions within a single package slot

При обновлении мира выпадает следующее:
!!! Multiple versions within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:
sys-kernel/linux-headers:0
('ebuild', '/', 'sys-kernel/linux-headers-2.6.23-r3', 'merge') pulled in by
('ebuild', '/', 'net-dialup/rp-pppoe-3.10', 'merge')
@system
('installed', '/', 'sys-kernel/linux-headers-2.6.25-r4', 'nomerge') pulled in by
@system
It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously. If such a conflict exists in the
dependencies of two different packages, then those packages can not be
installed simultaneously.
For more information, see MASKED PACKAGES section in the emerge man page
or refer to the Gentoo Handbook.
Насколько я понимаю linux-headers - не мультислотовый пакет, а при этом нужна разная версия его для разных программ... Пробовал маскировать пакет, но тогда тоже не идет поскольку выпадает тоже самое, только версии linux-headers другие...
Что делать подскажите...