The programs might use the notify library to work the magic but you might not have the external binary (notify-send) installed. It's in the package libnotify-bin.

Having said that, whereas the default notify thingy is quite pretty, it's sadly also pretty dumb. E.g. its developers decided that the end user must not be able to change the time a notification is displayed... Because of ideas like that I've switched to osd_cat command from xosd-bin package.

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