This is fixed upstream in what is probably going to be version 3.5.
src/qjackctlMainForm.cpp:
Qt::WindowFlags wflags = Qt::Window
#if QT_VERSION >= 0x040200
| Qt::CustomizeWindowHint
>#if QT_VERSION >= 0x040500
> | Qt::WindowCloseButtonHint
>#endif
#endif
| Qt::WindowTitleHint
| Qt::WindowSystemMenuHint
| Qt::WindowMinMaxButtonsHint;
Unusable is a bit harsh, you may still close the windows using the buttons on
the main window, but I agree it's inconvenient and a bit puzzling.
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[Jaunty] qjackctl has no buttons in its window or close button in title bar
https://bugs.launchpad.net/bugs/335212
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