Global USE flag

Enable application startup event feedback mechanism

Packages describing “startup-notification” as local USE flag

Package “startup-notification” Flag Description
mail-client/claws-mail Notification for new mail in different way, see also USE flags libcanberra, libindicate and libnotify
mate-base/mate Force notification daemon to default to MATE's notification daemon. Enabled by default. Disable if it causes conflicts with other installed desktop environments.
net-im/qtox Adds support for GTK Status Notifier tray backends
net-im/toxic Enables desktop notifications with libnotify, with sound support.
net-misc/eventd Enable plugin to display on-screen notifications