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Отвечу копипастой с вики: app-misc/foo[bar,baz] foo must have both bar and baz enabled. и Use dependency defaults If a dependency is introducing or removing a USE flag in a new package version, a (+) or (-) may be added to the use-dependency specification to define a default value in case the flag does not exist in the target package. The (+) indicates that the missing flag is assumed to be enabled, (-) the opposite. For example, the following will treat all boost versions without the threads flag as having it enabled, and all gcc versions without the openmp as having it disabled: DEPEND=" >=dev-libs/boost-1.48[threads(+)] sys-devel/gcc[openmp(-)]" Ref: https://devmanual.gentoo.org/general-concepts/dependencies/
Получается, пакет с такой зависимостью устанавливает\требует флаг wayland для месы.
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