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Error: Qt is not installed.

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DenJean:
Let your user start the program by a script, the script calls the actual program if Qt is available and otherwise use the many ways available to send a system message. So check existence of the message program, if it fails try the next one.

notify-send -t 0 "Testing" "Hello there"
xmessage -button ok -center file - "Hello"
shutdown -k -t 0 now "Hello"

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