Commands like `digikam --version`, `digikam --help` and `digikam --license` should not require an X display to run.
these options are provided by low level KDE framework API that digiKam depend. Gilles Caulier
Typically, KAboutdata is use to setup all options listed in this report and passed to QApplication data, which is a GUI based class which depend of low level window system under Linux. There is no way to change that easily. Gilles Caulier