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USE flags

• debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
• firmware - Enable support for firmware upgrades using sys-apps/fwupd
• flatpak - Enable support for flatpak repositories using sys-apps/flatpak
• snap - Enable support for snap packages using app-containers/snapd
• telemetry - Send anonymized usage information to upstream so they can better understand our users
• test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
• webengine - Enable webflow support using dev-qt/qtwebview and dev-qt/qtwebengine instead of default URL handler